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IGEM/UP/11 Edition 3 Draft for comment

Founded 1863

Royal Charter 1929

Patron: Her Majesty the Queen

INSTITUTION OF GAS ENGINEERS AND MANAGERS IGEM/TSP/17/128

Founded 1863 IGEM/UP/11 Royal Charter 1929

Communication XXXX Patron Her Majesty the Queen

Gas installations for educational establishments DRAFT FOR COMMENT 1 This draft Standard IGEM/UP/11 Edition 3 has been prepared by a Panel under the

chairmanship of Phillip Wild.

2 This Draft for Comment is presented to Industry for comments which are required by

30th June 2017, and in accordance with the attached comment form.

3 This is a draft document and should not be regarded or used as a fully approved and

published Standard. It is anticipated that amendments will be made prior to

publication.

It should be noted that this draft Standard contains intellectual property

belonging to IGEM. Unauthorised copying or use by any unauthorised person

or party is not permitted.

4 This is a copyright document of the Institution of Gas Engineers and Managers.

Enquiries should be addressed in the first instance to:

Thomas Donnelly

IGEM

IGEM House

26-28 High Street

Kegworth

Derbyshire, DE74 2DA Tel: 0844 375 4436 Fax: 01509 678188

Email:[email protected]


Founded 1863

Royal Charter 1929


Attached is the Draft for Comment of IGEM/UP/11 Edition 3 and the associated comment form.

We wish to make it as easy as possible for those of you representing industry bodies to issue

the draft to your Members. You can either forward this email with attachment complete or

forward it without the attachment and invite them to visit our website via where the Draft and

http://www.igem.org.uk/technical-standards/standards-development/drafts-for-comment.aspx

Comment Form are posted.

Organisations to which this Draft has been circulated:

ORG REP AIGT JOHN BARRATT Association of Register Gas Installers TONY BRUNTON BSI/GSE/30 GAVIN JONES

BPEC Awaiting contact BRITISH GAS RICHARD HARPER CAPITA DAVID J SMITH CIBSE HYWEL DAVIES CIPHE TONI-LOUISE MATTHEWS CITB RAY EWART

DNO COLLAB FORUM CHRIS CLARKE EI MARK SCANLON

ENA CLARE CANTLE-JONES EUSKILLS IAN MOSS GISG MIKE LEPPARD GAS SAFE REGISTER JOHN STIRLING HSE ANDREW COX

HSE MARGARET GREGSON HSENI JULIAN RICHMOND B&ES (was HVCA) RUSSELL MOTT ICOM ROSS ANDERSON *Large Business Forum TREVOR SMALLPEICE MAMCoP Board KEAVY LARKIN NATIONAL GRID HILARY BUXTON

NGN MARTIN ALDERSON NICEIC CHRIS LONG OFGEM STEVE BROWN

Organisation of professional gas operatives

WIM RUTJES

PIG CHERYL BURGESS

EUA (was SBGI) STEVEN SUTTON

http://www.igem.org.uk/technical-standards/standards-development/drafts-for-comment.aspx


Founded 1863

Royal Charter 1929


ORG REP SGN PAUL DENNIFF UKLPG RICHARD HAKEEM WALES & WEST CHRIS CLARKE

YPN DAVID MCLEOD IGEM

COUNCIL LESLEY ECOB SPC LESLEY ECOB MEMB C ROSS MCART

AUDIT C CHRIS BIELBY

TCC CHRIS GORMAN GMC VIC TUFFEN GUC RICHARD MARROW Industrial Affiliates KEVIN RANSOM


Founded 1863

Royal Charter 1929


IGEM/UP/11 Edition 3 Communication xxxx

Gas installations for educational establishments

Draft for comment


Price Code: C3S

© The Institution of Gas Engineers and Managers IGEM House

26-28 High Street Kegworth

Derbyshire, DE74 2DA Tel: 0844 375 4436

Fax: 01509 678198 Email: [email protected]

IGEM/UP/11 Edition 3 Communication xxxx

Gas installations for educational establishments

Draft for comment

mailto:[email protected]

Copyright © 201X, IGEM. All rights reserved

Registered charity number 214001

All content in this publication is, unless stated otherwise, the property of IGEM. Copyright laws

protect this publication. Reproduction or retransmission in whole or in part, in any manner,

without the prior written consent of the copyright holder, is a violation of copyright law.

ISBN XXX X XXXXXX XX X

ISSN XXX XXXX

Published by the Institution of Gas Engineers and Managers

Previous Publications:

Communication 1704 (2004) – 1st Edition

Communication 1744 (2010) – 2nd Edition

For information on other IGEM Standards visit our website, www.igem.org.uk


IGEM, IGEM House, 26-28 High Street, Kegworth, Derbyshire, DE74 2DA Website: www.igem.org.uk.

CONTENTS

SECTION PAGE

1 Introduction 1

2 Scope 4

3 Legal and allied considerations 6

3.1 Health and Safety at Work etc. Act (HSWA) 6

3.2 Building Regulations and Standards 6

3.3 Confined Spaces Regulations 7

3.4 Construction, Design and Management Regulations (CDM) 7

3.5 Control of Asbestos Regulations 7

3.6 Control of Substances Hazardous to Health Regulations (COSHH) 7

3.7 Dangerous Substances and Explosive Atmospheres Regulations 8

(DSEAR)

3.8 Electricity at Work Regulations 8

3.9 Gas Appliances (Safety) Regulations 8

3.10 Gas Cooking Appliances (Safety) Regulations 8

3.11 Gas Safety (Installation and Use) Regulations (GS(I&U)R) 8

3.12 Gas Safety (Management) Regulations (GS(M)R) 9

3.13 Management of Health and Safety at Work Regulations (MHSWR) 10

3.14 Pressure Systems Safety Regulations (PSSR) 10

3.15 Provision and Use of Work Equipment Regulations (PUWER) 10

3.16 Reporting of Injuries, Diseases, and Dangerous Occurrences 11

Regulations (RIDDOR)

3.17 School Premises Regulations 2012 12

4 Competency 13

5 Location and selection 14

6 Gas pipework 15

7 Isolation of gas pipework and appliances 22

7.1 Emergency control valve (ECV) 22

7.2 Additional emergency control valves (AECVs) 23

7.3 Appliance isolation 26

8 Laboratories 27

9 Art, craft, design and technology 29

9.1 Fixed and non-moveable appliances 30

9.1.1 General 30

9.1.2 Selection of equipment or appliances 30

9.1.3 Installation of gas-fired equipment 30

9.1.4 Flues and chimneys 31

9.1.5 Special procedures for ceramic kilns 31

9.2 Portable equipment 31

9.2.2 Mobile LPG Benches 31

9.2.3 Selection 32



9.2.4 Storage and siting of equipment 32

9.2.5 Use of equipment 32

10 Food technology rooms 34

11 Installing appliances 35

12 Ventilation 37

12.1 General 37

12.2 Flues 38

12.3 Food technology 39

12.4 Science laboratory – Additional requirements 40

13 Electrical supplies and wiring 42

14 Testing, commissioning and maintenance 43

15 Advice to be given to the user 44

16 Emergencies 45

APPENDIX

1 Glossary, acronyms and abbreviations, units 46

2 References 48

3 Diversity 52

TABLE

1 Installation standards for domestic appliances 35

FIGURE

1 Relative Natural Gas and Liquefied Petroleum Gas pressure levels for

educational establishments 2

2 Exposed PE pipework is not permitted 16

3 Suggested in-floor duct ventilation system where external

ventilation is not possible 17

4 Typical overhead boom system 19

5 Overhead boom system at false ceiling level 19

6 Gas pipework running through a ceiling void with joints,

showing location of vents 20

7 CSST pipework with route identity marking 21

8 Primary meter installation showing the ECV on the inlet (left hand) side 22

9 Additional emergency control valve 23

10 Example of a weep by-pass proving system 24

11 An example of a laboratory bollard 27



12 An example of a high pressure gases warning sign 28

13 Methods of provision of cooker stability 36


1

SECTION 1 : INTRODUCTION

1.1 This Standard supersedes IGEM/UP/11 Edition 2, Communication 1744, which is

obsolete.

1.2 This Standard has been drafted by a Panel appointed by the Institution of Gas

Engineers and Manager’s (IGEM’s) Gas Utilisation Committee, subsequently

approved by that Committee and has been approved by IGEM’s Technical

Coordinating Committee on behalf of the Council of IGEM.

1.3 This Standard provides requirements for those concerned with the design,

installation, operation and maintenance of gas pipework, systems and

appliances in educational establishments, including schools; colleges;

universities and training facilities. It brings together:

guidance, interpretation and clarification of Legislation, Standards and Codes

of Practice (CoPs) indicating the degree to which compliance is required,

including those items that are applicable, and

current best practice and design in the installation and use of Natural Gas

(NG) and Liquefied Petroleum Gas (LPG) installations.

1.4 This Standard sets down the minimum requirements for safety in educational

establishments, for architects, designers, science health and safety advisers,

teaching and technical staff, in the operation of their systems and equipment. It

is recognised that a risk assessment in some educational establishments may

indicate a need for additional features such as larger valve handles, more easily

accessible controls, signage in more than one language, in Braille or lower levels

of carbon dioxide (CO2) within the teaching areas for specific health reasons.

The responsibility for such measures lies with competent persons having

responsibility for the design of the installation. Note 1: It is recognised that specialist laboratory demonstration equipment may be used. In such

cases, a risk assessment is needed and the general principles of this Standard may be applied to ensure safety.

Note 2: Current standards for ventilation in teaching areas are covered in DfE Building Bulletin 101

(BB101).

1.5 IGEM/UP/11 Edition 3 has been prepared by IGEM’s Panel comprising

representatives from the Council of Gas Detection and Environmental Monitoring

(CoGDEM), CLEAPSS, Department for Education, Gas Safe Register and

consultants.

1.6 Responsibility for safety in local authority maintained establishments rests with

the local authorities. In foundation schools, voluntary aided schools, academies,

city technology colleges, universities and independent schools, such

responsibility rests with governing bodies or proprietors.

In Private Finance Initiative (PFI) establishments safety in respect of the

building and maintenance rests with the building provider, safety of the

occupants rests with the user, but there are areas where both parties have to

agree responsibilities. Any requirement in this Standard does not imply

Government commitment to the provision of extra resources or funds.

1.7 This Standard reflects current best practice. As a general principle, this

Standard does not duplicate national/international legislation or Standards.

However, where appropriate, additional guidance; interpretation and clarification

have been provided. Applicable references for Legislation, Standards etc. are

listed in Appendix 2.

1.8 Terms such as maximum operating pressure (MOP) and operating pressure (OP)

have been adopted to reflect gas pressure terminology used in European


2

standards. IGEM/G/4 defines these terms. These terms will arise in all relevant

IGEM Standards in future and possibly in other Standards.

Note: For a new system of installation pipework, the onus is on the designer to establish both the maximum incidental pressure (MIP) and MOP. For an existing system of installation pipework, the onus is on the designer/owner of the system to ensure that any increase in pressure within the system will not result in OP exceeding MOP of the system and on the gas transporter/meter asset manager (GT/MAM) to ensure that any change in their pressure regimes due to fault conditions will not jeopardise the safety of the downstream system. This involves effective communication between the GTs/MAMs and system designers/owners (see Figure 1).

STP

MIP

MOP

(example)

SP

OP

Time

Pre

ssu

re

For NG: STP = strength test pressure typically 82.5 mbar MIP = maximum incidental pressure typically 75 mbar MOP = maximum operating pressure typically not exceeding 28 mbar SP = set point of the regulator typically 21 mbar OP = operating pressure typically 19 to 21 mbar Note 1: This is extracted from IGEM/TD/13 and simplified for the purposes of IGEM/UP/11. For LPG: STP = strength test pressure typically 165 mbar

MIP = maximum incidental pressure typically 150 mbar MOP = maximum operating pressure typically not exceeding 45 mbar SP = set point of the regulator typically 37 mbar OP = operating pressure typically 32 to 45 mbar Note 2: 1 mbar = 100 P

FIGURE 1 - RELATIVE NATURAL GAS AND LIQUEFIED PETROLEUM GAS

PRESSURE LEVELS FOR EDUCATIONAL ESTABLISHMENTS

1.9 This Standard makes use of the terms “must”, “shall” and “should”, when

prescribing particular procedures. Notwithstanding clause 1.12:

the term “must” identifies a requirement by law in Great Britain (GB) at the

time of publication

the term “shall” prescribes a procedure which, it is intended, will be

complied with in full and without deviation

the term “should” prescribes a procedure which, it is intended, will be

complied with unless, after prior consideration, deviation is considered to be

acceptable.

Such terms may have different meanings when used in legislation, or Health and

Safety Executive (HSE) Approved Code of Practice (ACoPs) or guidance, and

reference needs to be made to such statutory Legislation or official guidance for

information on legal obligations.


3

1.10 It is now widely accepted that the majority of accidents in industry are in some

measure attributable to human as well as technical factors in the sense that

actions by people initiated or contributed to the accidents, or people might have

acted better to avert them.

It is therefore necessary to give proper consideration to the management of

these human factors and the control of risk. To assist in this, it is recommended

that due regard be paid to HSG48.

1.11 The primary responsibility for compliance with legal duties rests with the

employer. The fact that certain employees, for example, “responsible

engineers”, are allowed to exercise their professional judgement does not allow

employers to abrogate their responsibilities. Employers must:

have done everything to ensure, as far as is reasonably practicable, that

there are no better protective measures that can be taken other than relying

on the exercise of professional judgement

have done everything to ensure, so far as is reasonably practicable, that

“responsible engineers” have the skills, training, experience and personal

qualities necessary for the proper exercise of professional judgement

have systems and procedures in place to ensure that the exercise of

professional judgement by “responsible engineers” is subject to appropriate

monitoring and review

not require “responsible engineers” to undertake tasks which would

necessitate the exercise of professional judgement that is beyond their

competence. There should be written procedures defining the extent to

which “responsible engineers” can exercise their judgement. When

“responsible engineers” are asked to undertake tasks which deviate from

this, they should refer the matter for higher review.

These principles equally apply to designated/delegated employees, contractors,

etc.

1.12 Notwithstanding clause 1.10, this Standard does not attempt to make the use of

any method or specification obligatory against the judgement of the responsible

engineer. Where new and better techniques are developed and proved, they

should be adopted without waiting for modification to this Standard.

Amendments to this Standard will be issued when necessary, and their

publication will be announced in the Journal of IGEM and other publications as

appropriate.

1.13 Requests for interpretation of this Standard in relation to matters within its

scope, but not precisely covered by the current text, should be addressed to

Technical Services, IGEM, IGEM House, 26-28 High Street, Kegworth,

Derbyshire, DE74 2DA or emailed to [email protected] and will be

submitted to the relevant Committee for consideration and advice, but in the

context that the final responsibility is that of the engineer concerned. If any

advice is given by or on behalf of IGEM, this does not relieve the responsible

engineer of any of his or her obligations.

1.14 This Standard was published in XXXXXXX.

mailto:[email protected]


4

SECTION 2 : SCOPE

2.1 This Standard covers the design, installation, operation, and maintenance of gas

pipework, systems and appliances used for teaching purposes in educational

establishments including schools; colleges; universities and training facilities. Note: IGEM/UP/1101 provides guidance on the operational issues for gas systems and appliances.

2.2 This Standard assumes general compliance with other relevant Standards such

as IGEM/UP/2, IGE/UP/1 (or IGE/UP/1A or IGE/UP/1B as appropriate),

IGEM/UP/12, BS 6891, BS 6172 and BS 6173 and provide additional

requirements as considered necessary in educational establishments.

2.3 This Standard applies to new construction and replacement of, or extension to,

servicing, maintenance of existing installations. It is not retrospective, but it is

recommended that existing installations be modified to meet this Standard,

when appropriate. Note: Standards rarely cover the retrospective issue of existing installations. They can, however,

set a basis for consideration of performance upon which a risk assessment can be developed.

2.4 This Standard covers:

piped gas supplied from gas distribution systems such as a NG distribution

system or a LPG central bulk storage system

piped gas supplied through independent LPG supplies i.e. either a cylinder or

an individual bulk storage vessel

portable LPG systems and appliances, see also Sub-section 9.2

portable temporary LPG heaters, see Sub-Section 11.1.

2.5 This Standard applies to 1st, 2nd and 3rd family gases, as defined in BS EN 437. Note: 1st, 2nd and 3rd family gases can be heavier than air. 2nd family gases include lighter than air

gases such as NG and manufactured substitutes (hereafter referred to as NG). 3rd family gases include heavier than air gases such as LPG and sometimes further defined as

propane or butane and in the vapour phase.

2.6 This Standard does not cover gas installations in an individual domestic

dwelling integral with an educational establishment. However, the installation of

domestic gas appliances in an educational establishment itself is covered.

This Standard does not cover piped supplies to or from oxygen or acetylene

systems. In such cases reference needs to be made to HSE Guidance HSG 139 -

The safe use of compressed gases in welding, flame cutting and allied

processes.

This Standard does not cover liquid fuel systems, appliances and flues however

many of the risks associated with gas systems will also apply to liquid fuel

systems and similar standards of safety need to be applied. Advice for storage

and use of bottled gases and other gases used for educational purposes are

covered in CLEAPSS guidance.

Note: Gas meter installations are not covered in this Standard. IGEM/GM/6, IGEM/GM/8 or BS 6400 apply as appropriate.

2.7 This Standard does not cover the primary design requirements for central

heating and domestic hot water plant for which reference to IGEM/UP/10 is

necessary. However it does address automatic isolation valves (AIVs) and other

safety features for educational establishments.

2.8 This Standard does not cover central catering installations for which reference to

BS 6173 is necessary.


5

2.9 This Standard does not cover the installation and use of specialist test and

demonstration apparatus. For such apparatus, a competent person is required to

ensure the apparatus is fit for purpose. In addition, such apparatus may only be

operated by a competent person.

2.10 This Standard does not cover training and assessment facilities for gas

operatives.

2.11 All pressures are gauge pressures unless otherwise stated.

2.12 Italicised text is informative and does not represent formal requirements.

2.13 Appendices are informative and do not represent formal requirements unless

specifically referenced in the main sections via the prescriptive terms “must”,

“shall” or “should”.


6

SECTION 3 : LEGAL AND ALLIED CONSIDERATIONS

This Standard is set out against a background of Legislation in force in GB at the time of

publication (see Appendix 2). Similar considerations are likely to apply in other countries and

reference to appropriate national Legislation will be necessary.

Appendix 2 lists Legislation, guidance notes and Standards etc. which are identified within this

Standard as well as further items of Legislation that may be applicable.

Where Standards are quoted, equivalent national or international Standards etc. equally may

be appropriate.

Unless otherwise stated, the latest version of the referenced document should be used.

3.1 HEALTH AND SAFETY AT WORK ETC. ACT (HSWA)

HSWA applies to all persons involved with work activities, including employers,

the self-employed, employees, designers, manufacturers, suppliers etc. as well

as the owners of premises. It places general duties on such people to ensure, so

far as is reasonably practicable, the health, safety and welfare of employees and

the health and safety of other persons such as members of the public who may

be affected by the work activity.

3.2 BUILDING REGULATIONS AND STANDARDS

a) England and Wales (as Amended)

Building Regulations are Statutory Instruments that must be followed when

engaged in any building work. They are written in a format of broad

Regulations, setting out simple requirements in a Separate Schedule. Suggested

ways of complying with these Regulations are contained in Approved

Documents.

The Approved Documents that apply to gas work are:

A (Structure)

B (Safety in Fire)

F (Ventilation)

G (Hygiene)

J (Heat producing Appliances)

L (Conservation of Fuel and Power)

M (Access to and use of buildings)

P (Electrical Safety).

b) Building Standards (Scotland) Regulations and Amendments

The Building Standards (Scotland) are written directly as Regulations within the

Statutory Instrument. The Regulations can be satisfied:

by compliance with Technical Standards published by the Scottish Office

conforming with the provisions of “deemed to satisfy” documents, for

example British Standards

other equivalent means.

c) Northern Ireland (as amended)

The Regulations can be satisfied:

by compliance with Technical Standards


7

conforming with the provisions of “deemed to satisfy” documents, for

example British Standards

other equivalent means.

3.3 CONFINED SPACES REGULATIONS

These Regulations apply to a wide range of confined spaces. The supplier or

designer of an enclosure and equipment within it is required to perform a risk

assessment of the enclosure with respect to safe access and egress and to give

clear instructions to operators on access/egress as well as to what actions to

take in the event of a gas alarm occurring. Employers and the self-employed

should prevent entry into confined spaces unless avoidance is not reasonably

practicable and unless there is a system of work which renders the work safe.

They are also required to have specific emergency arrangements in place. More

information on the Regulations is given in L101. A free leaflet, INDG 258, is also

available.

3.4 CONSTRUCTION, DESIGN AND MANAGEMENT REGULATIONS (CDM)

CDM impose duties on designers, clients (and their agents), developers,

planning supervisors and principal contractors. Not all the Regulations apply to

all construction projects. Further information is given in L153. For a notifiable

project (as defined in CDM) the planning supervisor must notify HSE before

construction work commences. Construction includes the alterations, repair,

redecoration, maintenance, decommissioning or demolition of a structure. It

also covers installation, commissioning, maintenance or removal of gas services.

3.5 CONTROL OF ASBESTOS REGULATIONS

3.5.1 These Regulations set out standards for the identification, monitoring and

assessment of work that may expose workers to asbestos and the measures

needed to control the risk.

3.5.2 Employers cannot carry out any work that exposes, or is likely to expose,

employees to asbestos unless an assessment of that exposure risk has been

made. Employers have to set out steps to be taken to prevent, or reduce to the

lowest level reasonably practicable, that exposure. Employers have to carry out

medical surveillance of employees if they work over a certain time limit.

3.5.3 The Regulations impose a duty on those with responsibilities for the repair and

maintenance of non-domestic premises to find out if there are, or may be,

asbestos containing materials within them; to record the location and condition

of such materials and assess and manage any risk from them, including passing

of any information about their location and condition to anyone likely to disturb

them.

3.5.4 Further information is available in HSG 227. Other associated ACoPs are L127

and L143. In addition, advice is also available in HSE’s Asbestos Task manual.

3.6 CONTROL OF SUBSTANCES HAZARDOUS TO HEALTH REGULATIONS

(COSHH)

3.6.1 COSHH, which reinforce existing statutory obligations under HSWA, impose a

duty on employers to protect employees against risks to health, whether

immediate or delayed arising from exposure to substances hazardous to health,

either used or encountered, as a result of a work activity. They also impose

certain duties on employees.

3.6.2 Under COSHH, work must not be carried out which is liable to expose employees

to hazardous substances unless the employer has made a suitable and sufficient


8

assessment of the risk created by the work and the steps that need to be taken

to comply with COSHH. After assessing the risk, it is necessary to inform

employees of the risks and to carry out the appropriate training and instruction

to ensure the risks are minimised. In certain cases, control measures such as

ventilation or personal protective equipment may be necessary and where

provided they must be used.

3.7 DANGEROUS SUBSTANCES AND EXPLOSIVE ATMOSPHERES

REGULATIONS (DSEAR)

DSEAR are concerned with protection against risks from fire, explosion and

similar events arising from dangerous substances used or present in the

workplace. DSEAR require that risks from dangerous substances are assessed,

eliminated or reduced. They contain specific requirements to be applied where

an explosive atmosphere may be present and require the provision of

arrangements to deal with accidents, emergencies etc. and provision of

information, training and safe use of dangerous substances. DSEAR also require

the identification of pipelines and containers containing hazardous substances.

The following publications contain details of DSEAR and their application:

L138

INDG 370.

3.8 ELECTRICITY AT WORK REGULATIONS

3.8.1 These Regulations apply to a wide range of electrical work, from overhead

power lines to the use of office computers and batteries and include work on gas

equipment using electrical energy.

3.8.2 They are concerned with the prevention of danger from electric shock, electric

burn, electrical explosion or arcing or from fire or explosion initiated by electrical

energy.

3.8.3 They impose duties on every employer, employee and self-employed person and

require that persons engaged in electrical work be competent or be supervised

by competent persons. Note: A ‘‘Memorandum of Guidance on the Electricity at Work Regulations, 1989’’ is available

from HMSO and gives useful information on the Regulations. Further advice is contained in HSR25.

3.9 GAS APPLIANCES (SAFETY) REGULATIONS

Until 1992, the safety of consumers using gas appliances offered for sale in the

United Kingdom (UK) was covered, generally, by the Consumer Protection Act

and specifically, by the Gas Cooking Appliance (Safety) Regulations and the

Heating Appliances (Fireguard) Regulations. The Gas Appliances (Safety)

Regulations introduced specific requirements, for all gas appliances which must

be met before the product can be sold. All new appliances must carry CE

marking and be endorsed for use in the UK.

3.10 GAS COOKING APPLIANCES (SAFETY) REGULATIONS

These Regulations give specific requirements on installing cookers which may be

second hand or already belong to the customer.

3.11 GAS SAFETY (INSTALLATION AND USE) REGULATIONS (GS(I&U)R)

3.11.1 GS(I&U)R are relevant statutory provisions of HSWA setting out general and

detailed requirements dealing with the safe installation, maintenance and use of

gas systems, including gas fittings, appliances and flues.


9

3.11.2 GS(I&U)R address both NG and LPG (see Appendix 4 for properties of gases).

3.11.3 GS(I&U)R place responsibilities on those installing, servicing, maintaining or

repairing gas appliances, pipework etc. as well as suppliers and users of gas.

3.11.4 GS(I&U)R define the gas supplier for both NG and LPG and ACoP L56 provides

guidance on those definitions in particular for the more complicated case of LPG

supplied from vessels and from cylinders.

3.11.5 GS(I&U)R define the type of work that requires persons carrying out such work,

or their employers, to be a ‘‘member of a class of persons approved by the

HSE’’. In United Kingdom, the Isle of Man and the Channel Islands this means

registration under the Gas Safe Register scheme. Note: Guidance on individual competencies required for persons carrying out gas work at

premises not covered by GS(I&U)R is given in L56.

3.11.6 The installer must check the safety of any appliance or pipework they install or

work on and take appropriate action where they find faults. Where the premises

are let or hired out, the landlord or hirer has special responsibilities to ensure

that any installer they use for the gas fitting, service or maintenance or safety is

a ‘‘member of a class of persons approved by the HSE’’ (see clause 3.11.5) and

is competent to carry out such work. If any serious fault is found the installer

must inform both the landlord/hirer, as well as the user so that such faults can

be rectified before further use.

3.11.7 GS(I&U)R place responsibilities on LPG suppliers to deal with escapes of LPG.

For NG, GS(M)R applies (See Sub-Section 3.12). Note: Advice on dealing with gas escapes is contained in IGEM/SR/29.

3.12 GAS SAFETY (MANAGEMENT) REGULATIONS (GS(M)R)

3.12.1 GS(M)R place specific duties on GTs, or their emergency service providers

(ESPs), for dealing with gas escapes of NG from pipes on their networks. Their

primary duty is to make the situation safe. They are responsible not only for

dealing with escapes from their own pipes, but also for dealing with escapes

from gas fittings supplied with gas from pipes on their network. In GS(M)R, the

term “gas escapes” includes escapes or emissions of carbon monoxide (CO) from

gas fittings. Responsibilities for gas escapes of LPG are outlined in GS(I&U)R

(see clause 13.11.7).

3.12.2 The ESP has specific duties to:

provide a continuously staffed and free telephone service to enable persons

to report gas escapes and

pass such reports on to the person who has the responsibility for dealing

with the escape.

In addition, there are duties imposed on gas suppliers and GTs to notify the ESP

should they, rather than the ESP receive a report of an escape from the

consumer.

3.12.3 GS(M)R require GTs to investigate fire and explosion incidents upstream of the

emergency control valve (ECV) and to send a report of the investigation to HSE.

GTs are also required to investigate fire and explosion incidents downstream of

the ECV but this is limited to establishing whether the seat of the fire or

explosion was in an appliance and if so which one or in the installation pipework.


10

3.12.4 Responsibility for investigating RIDDOR reportable incidents (see Sub-Section

3.16) as a result of an escape of CO from incomplete combustion of gas from a

gas fitting, is placed on gas suppliers. HSE must be notified before such

investigations commence. Note: Advice on dealing with gas escapes is contained in IGEM/SR/29.

3.13 MANAGEMENT OF HEALTH AND SAFETY AT WORK REGULATIONS

(MHSWR)

In addition to specific duties under GS(I&U)R (see Sub-Section 3.11) MHSWR

impose a duty on employers and the self-employed to make assessments of

risks to the health and safety of employees, and non-employees affected by

their work. They also require effective planning and review of protective

measures.

3.14 PRESSURE SYSTEMS SAFETY REGULATIONS (PSSR)

3.14.1 PSSR impose duties on designers, importers, suppliers, installers and user or

owners to ensure that pressure systems do not give rise to danger. This is done

by the correct design, installation and maintenance, provision of information,

operation within safe operating limits and where applicable, examination in

accordance with a written scheme of examination drawn up or approved by a

competent person (as defined by PSSR).

3.14.2 Relevant fluids for the purpose of PSSR would be NG at a pressure greater than

0.5 bar and above atmospheric pressure or LPG (which is a liquid with a vapour

pressure greater than 0.5 bar and above at ambient temperature). A pressure

system would include bulk storage tanks, pipelines and protective devices but

not an LPG cylinder (transportable pressure receptacle). Once the pressure in

the pipework drops below 0.5 bar and the user/owner can show clear evidence

that the system does not contain and is not liable to contain, a relevant fluid

under foreseeable operating conditions then that part of the system is no longer

covered by the Regulations. This is likely to be the case after the pressure relief

valve associated with a pressure reducing valve which takes the pressure to

below 0.5 bar for example at the entry to a building. Note: The special requirements placed on protective devices in such systems (see paragraph

110b of L122). PSSR also apply to pipelines and their protective devices in which the pressure exceeds 2 bar (see Schedule 1 part 1 item 5 of L122).

3.14.3 More information is available in L122 and some information is presented in

INDG 261 and INDG 178.

3.15 PROVISION AND USE OF WORK EQUIPMENT REGULATIONS (PUWER)

3.15.1 Work equipment has a wide meaning and includes tools such as hammers,

laboratory apparatus, for example Bunsen burners, ladders, photocopiers, lifting

equipment and machinery for use at work.

3.15.2 PUWER place duties on employers in relation to selection, suitability,

maintenance, inspection, installation, instruction and training, prevention of

danger and control of equipment.

3.16.3 More information on PUWER is given in L22. Free leaflets include INDG 291 and

INDG 229.


11

3.16 REPORTING OF INJURIES, DISEASES AND DANGEROUS OCCURRENCES

REGULATIONS (RIDDOR)

RIDDOR require employers, self-employed people or those in control of work

premises to report certain work related accidents, diseases and dangerous

occurrences.

3.16.1 Other people have duties to report certain gas incidents which may not appear

to be work related:

Death, major injury, lost consciousness, or been taken to hospital for

treatment to an injury arising out of the distribution, filling, import or supply

of NG or LPG are to be reported by the conveyor for NG and the filler,

importer or supplier for LPG

dangerous gas fittings (as defined in RIDDOR) should be reported by a

"member of a class of persons". Gas Safe registered engineers are to provide

details of any gas appliances or fittings that they consider to be dangerous,

to such an extent that people could die, lose consciousness or require

hospital treatment. The danger could be due to the design, construction,

installation, modification or servicing of that appliance or fitting, which could

cause:

an accidental leakage of gas

incomplete combustion of gas or

inadequate removal of products of the combustion of gas.

3.16.2 Major injuries, death and dangerous occurrences are to be notified immediately,

for example by telephone, to the enforcing authority by the “responsible person”

as defined by RIDDOR. Report can be made to the Incident Contact Centre:

for fatal and major injuries only, telephone on 0845 300 9923 (opening

hours Monday to Friday 8.30 am to 5 pm) and complete appropriate on-line

form

all other reports at HSE website www.hse.gov.uk

Complete the appropriate online report form listed below.

report of an injury

report of a dangerous occurrence

report of an injury offshore

report of a dangerous occurrence offshore

report of a case of disease

report of flammable gas incident

report of a dangerous gas fitting.

The form will then be submitted directly to the RIDDOR database and a copy

issued to the person making the report.

On-line written reports are to be submitted within the required timescale (10

days, or 14 days for dangerous gas fittings). Other reports need to be made as

soon as practicable and within 10 days of the incident.

3.16.3 INDG 453 contains detailed guidance on RIDDOR, including a full list of injuries

etc. that need reporting.

3.16.4 IGEM/GL/8 provides guidance on the reporting and investigation of gas-related

incidents.

http://www.hse.gov.uk/


12

3.17 SCHOOL PREMISES REGULATIONS 2012

3.17.1 The Education Act 1996 places a duty on the Secretary of State for Education to

prescribe standards for the premises of all maintained schools in England and

Wales. The Regulations apply to nursery, community, community special,

foundation, foundation special and voluntary schools and to pupil referral units.

Those for England are set out in The School Premises (England) Regulations

2012 (SPRs) and they apply to all existing and new schools maintained by a

local authority. The Education (School Premises) Regulations 1999 continue to

apply to maintained schools in Wales.

3.17.2 The Education Act 2002 (as amended by the Alternative Provision Academies

and 16 to 19 Academies (Consequential Amendments to Subordinate

Legislation) (England) Order 2012) and the Education (Independent School

Standards) (England) (Amendment) Regulations 2012 empowers the Secretary

of State to prescribe standards for the premises of independent schools, which

include Academies (including alternative provision Academies) and Free Schools.

These are set out in Part 5 of The Education (Independent School Standards)

(England) Regulations 2014 (ISS).

While there continues to be two sets of school premises Regulations in place,

their requirements are now identical in England and all types of schools now

have to meet the same standards.


13

SECTION 4 : COMPETENCY

4.1 Persons who design gas installations must have a knowledge and understanding

of the Regulations and Standards that apply to ensure that the completed plans

will produce a safe and satisfactory installation. The design shall also ensure

safe operation and maintenance. A competent person is also someone who has

sufficient training and experience or knowledge and other qualities that allow

them to safely perform a task. The level of competence required will depend on

the complexity of the situation and the particular risks associated with the task.

4.2 Persons who install or maintain gas pipework, systems and appliances in

educational establishments must be competent to do so and compliance with

GS(I&U)R must be achieved where those Regulations apply.

4.3 All gas works must be carried out by a business or self-employed person(s) that

is a ‘‘member of a class of persons approved by (see clause 3.11.5).

4.4 Teaching staff who operate a gas fired appliance shall be trained on the safe use

and operation of the appliance. Persons who do not satisfy clause 4.3 must not

perform work on gas pipework and appliances. Changing LPG cylinders and

cartridges is not considered to be ‘‘work’’ under GS(I&U)R. but they must still be

able to perform the work in a safe manner.


14

SECTION 5 : LOCATION AND SELECTION

5.1 Appliances and associated equipment/controls shall be selected such that they

are suitable and safe for their operation and maintenance by persons with a

wide range of abilities.

5.2 Appliances shall be located in rooms/spaces that are suitable and safe for their

operation and maintenance.

5.3 Type A and Type B space or water heating appliances shall not be located within

a teaching area. Type C appliances for space or water heating should not be

located within a teaching area unless suitably protected against contact with hot

surfaces, interference and physical damage as required by a risk assessment.

Note: For emergency heating for example short term use of LPG cabinet heaters or electric

space heating to be supported by a risk assessment.

5.4 The construction of nearby surfaces shall be able to withstand the weight of

appliances, the temperatures generated when in use. Provision shall be made for

the safe disposal of any waste liquids associated with the operation and use of

the appliance (e.g. condensates).

5.5 Openings from rooms (floors, walls and ceilings) shall be sealed to prevent the

transmission of any gases or combustion product to other occupied spaces.


15

SECTION 6 : GAS PIPEWORK

6.1 Installation pipework shall be installed in accordance with IGEM/UP/2. Gas

system operating pressures shall not exceed 50 mbar except in special

circumstances for specialised experimental equipment or where LPG cartridges

are used. In such cases a full risk assessment covering the safe provision of gas

shall be carried out, see IGEM/UP/16.

6.2 NG pipework shall have a design pressure drop from the outlet of the meter

installation to the point of use, isolation valve or gas tap, as appropriate not

exceeding 1 mbar for NG. LPG pipework shall have a design pressure drop from

the outlet of a meter installation or pressure vessel installation to the point of

use, isolation valve or gas tap, as appropriate not exceeding 2 mbar for.

Note 1: It may be appropriate to have higher pressure drops for a NG system of OP exceeding 25 mbar, or an LPG system of an OP exceeding 45 mbar for propane and 35 mbar for butane.

Note 2: IGEM/UP/2 contains the relevant requirements.

6.3 When sizing pipework, if it is proposed to make allowance for diversity of usage

due consideration shall be given to safety in the event of all appliances being

used at once e.g. that they all continue to operate safely. Note 1: For example, a laboratory may have 60 gas taps but a design maximum of 30 students.

Each may be operating a Bunsen burner so the design load could be 30 Bunsen burners. Allowance could also be made for extra pupils and the design might then be for 40 Bunsen burners in use. Similarly, if there are 30 gas cookers, it is unlikely that they will all be in use at the same time and for example a 70% load diversity could be applied.

Note 2: See IGE/GL/1 and BS 6400 for further information about diversity. Note 3: Due account of the additional pressure drops across AIVs, check meters and non-return

valves (NRVs) need to be taken into consideration to ensure the maximum design pressure drop is not exceeded.

6.4 Pipework shall be readily identified to indicate it carries a fuel gas. This shall be

achieved by fully painting with Ochre yellow to BS 4800 08 C 35 or Primrose

yellow to BS 4800 10 E 53 colours or by banding the pipe (which does not have

to be painted) with GAS marker tape or in accordance with BS 1710.

LPG pipework shall be permanently marked “LPG” at valves and major changes

of direction/tees. Note 1: IGEM/UP/2 contains more information. Note 2: Safety warning signs will be black lettering on a yellow background. Further guidance is

given in L64.

The installation and siting of any LPG storage vessel shall comply with UKLPG

Codes of Practice and HSE Guidance. The location shall make due allowance for

the separation distances from buildings, boundaries and property lines, the

proximity of nearby and overhead cables, access for delivery and installation

vehicles.

6.5 Bulk storage should be secured from tampering by the use of lockable valve

covers or fenced compounds. Cylinder systems should be located inside locked

cages or ventilated lockers. Siting shall take account of safe access for refilling

bulk vessels and changing of cylinders.

LPG cylinders (other than cartridges) shall not be located within the building,

other than in a sealed and fire protected compartment located on/within the

outer building wall, that is accessible only from outside the building and

naturally ventilated solely to outside the building. See Sub-Section 9.2.4

mobile LPG benches. See also BB100 and UKLPG Cop 24 Part 6.


16

6.6 For a piped gas supply to any burner provided with air, oxygen or other

extraneous gases under pressure a suitable device must be installed upstream

of the first control in the gas supply to each burner, group of burners or the

plant. Note 1: The suitable device may be a NRV. Note 2: This is a legal safety requirement and the installer needs to recommend that this valve be

included in an annual maintenance check.

Manual burners provided with air, oxygen or other extraneous gases under

pressure, such as on brazing hearths, shall be fitted with a NRV at each location

to protect the rest of the gas supply system.

6.7 The materials chosen for pipework shall be selected with regard to the ability to

withstand damage or unauthorised interference. Note: Concealed pipework routes or the use of steel pipes are typical options.

Copper and pliable stainless steel (CSST) pipework that is exposed or surface

mounted and is not protected against foreseeable damage shall not be used.

Where copper pipe is located in concealed locations, it shall preferably be joint

free or be brazed. Where not practicable it shall be jointed using capillary

fittings.

6.8 Polyethylene (PE) pipework shall not be installed in a building and shall not be

exposed when installed outside a building (see Figure 2 and more detailed

advice in IGEM/UP/2).

FIGURE 2 - EXPOSED PE PIPEWORK IS NOT PERMITTED

6.9 Any manual isolation valve shall be securely fitted with a valve handle. Note: Such handles and hence valves may be interfered with if located in a vulnerable location.

Nevertheless manual isolation valves need to be accessible for maintenance and where intended, for use in an emergency.

6.10 Any pipework system shall include isolation valves and local purge points at

intersections/branches.


17

Note: This allows maintenance, repair and modification without the need to shut down the whole system.

Any purge connection should be at least R3/4 or 25% of the pipe size whichever

is the larger and these should be located at each end of any pipe section that

may need to be purged during commissioning or decommissioning.

6.11 Where pipework is located in a floor duct or ceiling space , either:

the duct or space shall be ventilated to outside air, or

the duct or space shall be ventilated into the room (see Figure 3 for lighter

than air gases) or

the duct or space shall be filled with dry inert material, such as dry washed

sand or crushed slate

for LPG systems in ducts, refer to IGEM/UP/2.

FIGURE 3 - SUGGESTED IN-FLOOR DUCT VENTILATION SYSTEM

WHERE EXTERNAL VENTILATION IS NOT POSSIBLE

6.12 Appliance Connections

6.12.1 Fixed appliances shall be connected to the gas supply using one of the methods

permitted by IGEM/UP/2.

6.12.2 Appliances which are required to be moved from time to time (e.g. for cleaning)

shall be connected using a flexible appliance connector a self-sealing plug/socket

complying with BS EN 15069 and one of the following methods, as appropriate:

a flexible hose complying with BS 669-1 for domestic cooking appliances

used in food technology settings

a flexible hose complying with BS 669-2 for domestic and commercial

equipment in a catering training setting

or a flexible hose complying with BS EN 14800.

6.12.2.1 Flexible appliance connectors shall:

be as short a reasonably practicable and not exceed 1.4m long

be located in an accessible position

be connected to the fixed gas installation pipework with self-sealing and

swivel plug/socket end connections

ventilator

floor screed

ventilated floor ductgas pipe

gas pipe passes throughsleeve

sleeve sealed at one end


18

be protected by stainless steel restraint cables, fixed to a secure surface

such as a wall, floor, or fixed bollard of such length as will prevent the

flexible connection from being strained, excessively bent at its connections

or allowed to contact hot surfaces.

6.12.2.2 Restraint cables shall not be fixed to the gas pipework. In an overhead boom the

point of fixing should be as high as practicable to prevent hanging loops of the

restraining cable causing a hazard.

Note: For ease of use, it may incorporate a snap-shackle for simple connection to a boom or to

the building structure.

6.12.2.3 A self-sealing plug shall be connected to every self-sealing fitting to seal the

connection when not in use, unless there is a manual isolation valve fitted

immediately before the fitting.

6.12.2.4 Pliable corrugated stainless steel tubing shall not be used for connecting

moveable appliances.

6.12.3 Lightweight readily-moveable appliances such as laboratory Bunsen burners,

hand torches, small boiling rings, etc. that are fitted with a connection designed

to accept flexible tube by the manufacturer, and which are operated under

continual supervision may be connected to the gas supply using flexible rubber

tubing, under the following conditions:

the tubing shall be as short as reasonably practicable and not exceed 1.0m

long

such tubing may only be used when connecting to a bench top type

laboratory tap

where the outer diameter of the tube is 8mm or greater, the tube shall be

secured using a crimp or swaged or worm type clip providing that the

pressure does not exceed 50 mbar. Crimp or swaged type clips shall be

applied for pressures exceeding 50 mbar for all hoses.

Note: For these applications the flexible tubing may be natural or synthetic rubber and selection depends on the gas in use. Natural rubbers are not normally suitable for use with LPG or for NG above 50mbar. A synthetic rubber such as neoprene may be suitable for NG and LPG gases.

6.12.3.1 Flexible tubing used shall be subject to regular inspections and replaced after

five years’ service or before if showing signs of:

physical damage, such as cuts or abrasions, stretching, flattening, kinking

and where fitted, missing/worn sealing washers, damaged cylinder

connections

environmental deterioration such as stiffening, cracking, delamination of

outer covering, chemical degradation i.e. softening of outer coating by

contact with oil

failure such as – blistering, soft spots, rupture and, for preassembled end

fittings, corrosion or loosening of swaged fittings attaching hose.

If the tubing replacement date is not date marked by the manufacturer, the

installer should mark it with the year of replacement or record the replacement

date in the site technical file.

Note: This is normally 5 years but may be as long as 10 years, depending upon materials. See BS 6891.

6.13 Any overhead boom shall be directly ventilated into the room and sealed to

prevent gas ingress into the ceiling space (see Figures 4 and 5).


19

FIGURE 4 - TYPICAL OVERHEAD BOOM SYSTEM

FIGURE 5 - TYPICAL OVERHEAD BOOM SYSTEM AT FALSE CEILING

LEVEL


20

6.14 Any duct or ceiling void containing gas pipework shall be ventilated to ensure

that minor gas leakage does not cause the atmosphere within the duct or void to

become unsafe. Note 1: The level of ventilation is not intended to clear a major gas escape arising from damage or

failure of a gas pipe. Note 2: IGEM/UP/2 gives additional guidance on ventilation of pipework.

Pipework located in ceiling voids is a special safety issue in many old designs of

educational establishments. GS(I&U)R state that all pipework has to be in a

ventilated location. Any unventilated void containing gas pipework shall be

modified to include ventilation either to the outside air or internally to a

normally occupied space, such as a corridor. Note: Care will be needed to ensure that fire compartment walls/floors are not breached (see

relevant Building Regulations and Standards).

6.15 Where gas pipework is located within a ceiling space, the space shall be

ventilated along the route of the pipe normally near to joint locations.

FIGURE 6 - GAS PIPE RUNNING THROUGH A CEILING VOID WITH

JOINTS, SHOWING TYPICAL LOCATION OF VENTS

A ventilated grille panel should be located near to each joint. Where this is not

practicable, a gap of approximately 80 mm around the ceiling perimeter should

be applied (see Figure 6) Note 1: An alternative is to form a small horizontal duct within the ceiling space containing the

pipe and to ventilate this duct at each end with a grille free area of not less than 100 cm2

or 50% of the cross sectional area, whichever is the greater. Note 2: More detailed information on provision of duct ventilation is given in IGEM/UP/2.

6.16 Where an overhead gas pipework supply is to extend to portable equipment;

work benches or fume cupboards, the pipework shall be adequately supported

and fixed in such a way that it cannot “sway”.

For an overhead distribution boom containing a number of laboratory services,

each boom shall be fitted with a manual isolation valve to assist in the

maintenance of the equipment.

6.17 Where CSST is used in an unventilated space a separate sleeve i.e. not the

plastic cover to the stainless steel tube, shall be applied throughout its length

within the space.

Flanged joint

Screwed joint


21

6.18 Each “run” of CSST pipework shall be indelibly and permanently marked at

locations along its route to discriminate the individual “runs” from each other

(see Figure 7). Note: For example, for science areas, label Lab 1 supply, Lab 2 supply, kitchen supply, etc.

6.19 CSST shall be supported throughout its route for example on cable trays (see

Figure 7). Note: Cable ties may also be used to secure horizontal “runs” of pipe.

FIGURE 7 - CSST PIPEWORK WITH ROUTE IDENTITY MARKING

LA

B 1

LA

B 2

LAB 3

CLA

SS 7

CLA

SS 8

WORKSHOP 1

WORKSHOP 2

LIBRARY

KITCHEN

DE

SIG

N S

TU

DIO

GYM

OFFIC

E


22

SECTION 7 : ISOLATION OF GAS PIPEWORK AND APPLIANCES

7.1 ECV

7.1.1 An ECV must be provided by the GT and designated as the ECV to enable the

supply of gas to the premises to be shut off in the case of an emergency. It will

be situated at the end of the gas service and be upstream of any primary meter

installation. Note 1: For larger installations with twin stream regulators and possibly a meter by-pass, it may

be convenient to designate the inlet or outlet meter isolation valve as an additional emergency control valve (AECV) to satisfy requirements under GS(I&U)R for emergency control (see clause 6.2).

For LPG installations without a meter the ECV should be located near to the

outlet of the pressure vessel regulators.

7.1.2 The ECV must be operated by a key, lever or a hand-wheel which is securely

attached to the operating spindle of the control.

7.1.3 The ECV must be readily accessible for use in an emergency and the space

around it must be kept clear of stored items and flammable materials (see

Figure 8).

FIGURE 8 - PRIMARY METER INSTALLATION SHOWING THE ECV ON THE

INLET (LEFT HAND) SIDE

7.1.4 The means of operating the ECV shall be clearly and permanently marked or a

notice in permanent form shall be prominently displayed close by to indicate

whether the valve is open or closed. Note: The handle may be painted red to enable quick discrimination in an emergency.

7.1.5 Where vandalism or misuse is a possibility, access to the ECV may need to be

restricted by means of a locked door, cabinet etc. and the key held in a place of

security. In such circumstances a permanent notice shall be displayed near to

the lock indicating where the key may be readily obtained. Note: The problem of unauthorised entry renders it generally impractical to locate a manual

valve outside a building or even outside a self-contained area. In addition, the problems of unauthorised tampering with the valves may lead to hazardous situations.

Appropriate staff to be briefed on the location and operation of the ECV.


23

7.2 ADDITIONAL EMERGENCY CONTROL VALVES (AECVs)

7.2.1 For use in an emergency situation an AECV shall be installed as near as

practicable to points where installation pipework enters each separate teaching

and preparation area (see Figure 9). Particular attention shall be given to

considerations of unauthorised use and accessibility in the event of an

emergency. Note: The use of a back-up AIV with manual reset may be a solution, see clause 7.2.3.

Relevant staff shall be trained on the location and operation of any AECV.

FIGURE 9 - ADDITIONAL EMERGENCY CONTROL VALVE

7.2.2 Any AECV shall:

be easy to operate and located in a readily accessible position for use by

teaching and technical staff. It shall not be located in a locked area such as

in a secure box or in another teaching or preparation area unless suitable

provisions are made for access in an emergency

if manually operated, be fitted with a suitable key, lever or hand-wheel

which is securely attached to the operating spindle

where the key or lever moves in the vertical plane, move to the “off”

position in a downward direction

be labelled or marked to show its open and closed positions (See Figure 9). Note: The handle may be painted RED to enable quick discrimination in an emergency.

A permanent notice shall be displayed near to the AECV position indicating that

immediately before and immediately after opening the AECV, a responsible

person should verify that all downstream manual valves/gas taps (including

those in fume cupboards) are turned off. Note: A similar notice will be needed if an AIV is installed for security reasons (see Note to

clause 7.2.1 and 7.2.3).

7.2.3 Where it is not practicable to install a manual isolation valve in a readily

accessible position or where it is required to interlock the gas supply with other


24

safety systems such as air flow, fire or gas detection an automatic means of

isolation AIV shall be installed.

7.2.4 Automatic isolation valves (AIVs) in teaching areas

7.2.4.1 Where an AIV is required by clause 7.2.3 in gas supplies to teaching areas which

have appliances that are not fitted with flame safeguards, an automatic means

of proving that downstream valves of the burners/appliances are closed shall be

fitted (see Figure 10). This proving system should not supply more than one

teaching area. The system shall be such that it can only be reset by authorised

persons, for example with a key or a key code.

A means to stop the system in an emergency shall be positioned near the

teacher’s desk/board and either next to main light switches or at the exit from

the room. The stop device may need to be shielded unless in a protected

position. AIV Gas valves shall comply with BS EN 161. Note 1: It is recommended that valve proving systems be checked daily when in use and that the

teacher should turn the gas off by pressing the system stop button at the end of the

working day. It is advisable for the installer to fit a notice near the control system recommending that the stop button should be pressed at the end of the working day.

Note 2: Further guidance on valve proving systems is provided in IGEM/UP/2. Other gas proving

systems may be acceptable provided the general principles as outlined in IGEM/UP/2 are met. The operation of such systems is at the discretion of a responsible person based on risk assessment of the application.

Note 3: Valve proving systems are not required where all the downstream appliances are fitted

with full flame safeguard systems.

FIGURE 10 - EXAMPLE OF A WEEP BY-PASS PROVING SYSTEM

(see note 2 in clause 7.2.4.2)

7.2.4.2 Such automatic means of isolation shall in the event of a shut-down require

manual resetting to take place.

7.2.4.3 Fume cupboards may introduce particular hazards and shall be protected by the

laboratory pipework integrity system. In such cases an AIV should be fitted to

cover the fume cupboard which closes on isolation of the power to the fume

Gas flow

S.S.O.V.

Weep valve

Flowlimitingorifice

Gas pressure switch


25

cupboard. Any Emergency Stop button should not normally stop the mechanical

extract system. The system may however need to be stopped in the event of fire

to prevent it spreading into the ductwork.

7.2.4.4 A permanent notice shall be displayed near to the services reset position

indicating that, immediately before and immediately after closing the AIV

system, a responsible person shall verify that all downstream manual isolation

valves/gas taps (including those in fume cupboards) are turned off.

7.2.4.5 In existing teaching areas where no automatic means of isolation is fitted

downstream of the laboratory or classroom AECV, a permanent notice shall be

fitted stating that all downstream gas valves serving individual burners or

appliances shall be checked to be in the off position prior to closing or opening

the isolation valve. In this case the AECV shall be located in a readily accessible

position for the teaching or support staff to operate.

7.2.5 Boiler/plant rooms

Note: Boiler/plant rooms within educational establishments are recommended to be treated as

areas of higher risk with respect to unauthorised entry and interference.

7.2.5.1 In addition to the requirements of IGEM/UP/10, the following additional safety

precautions are required for new educational establishments and where existing

boiler/plant rooms are to be upgraded or refurbished.

A means to automatically shut off the fuel supply in the event of a fire shall be

installed. This should include an emergency shut-off push button at the entrance

to the plant room/boiler house and for any gas system shut off shall be

accomplished by closure of a valve complying with BS EN 161. The system shall

isolate the electrical power to some or all the plant as considered appropriate. In

the event of an alarm condition, the system should require manual resetting. Note 1: Where shut down is the result of a power supply failure automatic resetting of the power

supply (local or remote) is permitted. Alternatively, a system of alarm notification to remote key holders may be used. The risk of interrupting power supplies to remote plant controlled by the boiler house control panel needs to be assessed and the plant designed

accordingly. Many modern package burners require local manual reset in the event of loss of power, as required by BS EN 676.

Note 2: Pipework integrity systems (see clause 7.2.4.3) are not normally required for modern

boiler/heating plant incorporating flame safeguard systems. Note 3: Many existing plant rooms/boiler houses are fitted with a manual isolation valve on the

fuel supply. The requirement for automatic isolation of the gas supply to new buildings is not intended to be retrospectively applied to existing buildings, except as may be necessary as part of the conclusions from a risk assessment.

Note 4: In the event of fire within a plant room which forms part of a main building it is

recommended that the general building fire alarm system is actuated.

7.2.5.2 A heat detection system should be installed and linked to the fire alarm system

to raise an alarm. Note: Heat detection is preferable to smoke detection in a plant/boiler room as smoke detection

is more likely to cause false alarms.

7.2.5.3 During the initial risk assessment the design shall be considered for potential

gas releases, including those that may be caused by vandalism. Secure locking

of boiler rooms may mitigate the risk and lessen the need for flammable gas

detectors. Note: The use of welded steel pipework will help limit the risk of gas releases.

Copper pipes and small unions may be a particular risk and should be avoided

as far as practicable.


26

Gas pipework shall be supported as required by IGEM/UP/2.

7.2.5.4 Where required by clause 7.2.5.3, flammable gas detectors shall be mounted in

accordance with the manufacturer’s instructions and at locations where gas

leakage may accumulate for example:

for NG, the gas detectors be mounted at high level at or near the air grilles

for LPG, the detectors should be mounted at low level at or near air grilles

for biogas, the gas detectors should be mounted at high and at low level at

or near the air grilles.

The DSEAR risk assessment (see IGEM/UP/16) will recommend the frequency of

boiler room inspection visits to ensure the integrity of the gas pipework. Where

this frequency cannot be satisfied then gas detection shall be applied.

7.2.5.5 Where a risk assessment identifies that there is a risk of combustion products

passing from a boiler room/enclosure/space into an occupied space such as a

teaching area/corridor/office, a CO detection system shall be installed in the

occupied area. The CO detection system shall raise an alarm and shall isolate the

fuel supply to the appliance.

7.2.5.8 Where a plant/boiler room/enclosure/space connects directly to or is accessed

from a teaching area such as a cupboard in a classroom or corridor,

consideration shall be given to installing a flammable gas detection system. For

NG this should be at high level and for heavier than air gases this should be at

low level. The detection system(s) should raise an alarm and, it shall also isolate

the fuel supply.

7.3 APPLIANCE ISOLATION

7.3.1 A means shall be provided in an accessible location to manually isolate each

appliance from the gas supply.

7.3.2 A single manual isolation valve shall be provided in an accessible location to

isolate the gas supply from each group of appliances such as a group of gas

cookers. The valve shall be of the quick acting type for example a 90o operation

and shall be easily identifiable.


27

SECTION 8 : LABORATORIES

For the purposes of this Standard, the term “laboratories” includes “preparation rooms”.

8.1 Laboratories should be designed as individual units with individual gas safety

controls for each unit.

8.2 Consideration shall be given, during the design of laboratories to the installation

of manual isolation valves at each bench or group of benches to enable easy

maintenance of bench top gas taps.

8.3 Where practicable, any gas tap shall be located above any table, bench or other

working surface. It shall not be located in a position such as the side of bench

etc. where it may be susceptible to mechanical damage or cause injury (see

Figure 11).

8.4 Any gas tap should be manufactured to BS 1552 and be so designed that it’s

‘‘on’’ and ‘‘off’’ positions can be readily identified. It should be of a design where

it is not possible to turn on the tap by accident for example be of drop lever or

press and turn design.

8.5 The body of any tap supplied by pipework passing through a worktop etc. shall

be designed such that it can be rigidly located for example by the use of

matching shaped holes cut in the worktop etc. such that rotation of the

complete tap is prevented.

8.6 Workbenches and bollards containing or supporting gas pipework shall be

anchored to the floor by corrosion resistant fixings. There shall be no movement

possible which could lead to degradation of pipework or compromise of pipework

seals. Stability shall be ensured by the installer and checked frequently

thereafter by laboratory staff as part of scheduled the gas safety checks.

Any substandard fixing which allows movement of the work bench or bollard

shall be replaced prior to use.

FIGURE 11 - AN EXAMPLE OF A LABORATORY BOLLARD

8.7 Where a modular bench assembly with gas taps/electrical supplies is to be

installed or where a gas supply is within a bench assembly adequate ventilation

shall be provided. For an internal bench of volume not exceeding 1 m³

ventilation of at least 20 cm² free area at both high and at low level shall be

allowed. This shall be increased pro rata per increase in volume.


28

Ventilation of benches shall be to the outside or to normally occupied, ventilated

classrooms.

8.8 Where high pressure gas is used in conjunction with a gas burner such as

compressed air or oxygen a NRV of an approved type must be installed in the

gas supply to the laboratory, or at each location where the high-pressure gas is

to be used. Note: This is a legal safety requirement and this valve is to be included in an annual

maintenance check. A sign needs to be affixed to the meter installation (see Figure 12 for a safety label).

FIGURE 12 - AN EXAMPLE OF A HIGH PRESSURE GASES WARNING SIGN

8.9 Flammable gas detection systems should not normally be necessary in school

laboratories but where fitted they shall be resistant to the effects of flammable

solvents and chemicals that may lead to nuisance shutdowns. The requirement

for fitting a gas detection system should be the subject of a risk assessment.

8.10 Any LPG cylinder supplying gas to apparatus shall not be located inside a

building. Note: This does not apply to small LPG cartridges used within soldering/jewellery blow torches

or mobile science benches.

8.11 For fume cupboards, a risk assessment shall be performed to ascertain if the

gas supply and extract system needs to be interlocked.

Note: For fume cupboards having additional means of protection such as built in-explosion

reliefs or where the gas supply is part of the laboratory gas pipework integrity system, the gas supply may not require interlocking the gas and extract air systems. However, those using fume cupboards need to be instructed to ensure that gas burners are turned off when not in use and that gas flames are monitored whilst in use. A suitable sign may need to be displayed showing this information at the fume cupboard.

Before gas or air at elevated pressure or any

extraneous gas is used in conjunction with

the gas supply, the gas transporter must be

contacted as a non-return valve will probably

be required.

Gas transporter

WARNING NOTICE

NON-RETURN VALVES


29

SECTION 9 : ART, CRAFT, DESIGN AND TECHNOLOGY

9.1 FIXED AND NON-MOVEABLE APPLIANCES

9.1.1 General

Gas-fired equipment used in art, craft and design and technology areas typically

includes ceramic kilns, small crucible melting furnaces, forge hearths, glue pots,

oxygen-assisted working flames for jewellery manufacture and small open

ended forge furnaces.

For this type of equipment, reference shall be made to IGEM/UP/12.

9.1.2 Selection of equipment or appliances

9.1.2.1 Subject to clause 9.1.2.2, all new equipment of heat input exceeding 50 kW

shall incorporate a flame safeguard device.

Where practicable, new equipment of heat input less than 50 kW shall

incorporate a flame safeguard device.

9.1.2.2 In the exceptional case when plant operates at temperatures in excess of

750°C, as a minimum a pipework integrity system should be fitted. The user

instructions should advise that such systems be under constant supervision (see

Note 2). Where this is not practicable a flame safeguard system shall be fitted. Note 1: Further guidance on pipework integrity systems is in clause 7.2.5.3. Note 2: In this context “constant supervision” means that a responsible person who is competent

to operate the equipment is in control at all times.

9.1.2.3 Thermo-electric flame safeguard systems should only be used on open burners

and shall not be used within kilns. Note: The heat emitted from a kiln wall could result in a thermo-electric flame safeguard system

remaining open when it should be closed.

9.1.2.4 Where burner start-up is programme-controlled any automatic gas burner shall

conform to BS EN 676 or IGEM/UP/12.

9.1.2.5 Any burner supplied with combustion air from a fan, compressor or cylinder

shall be fitted with a pressure/flow sensor/switch in the air stream to detect air

flow (see the attached note). Failure of the flow of air shall result in immediate

closure of two electrically-operated gas safety shut-off valves (SSOVs) in the

supply to the burner(s). The valves shall be manufactured to BS EN 161. Note: Any burner firing in the open such as a brazing torch or a burner fitted to an appliance of

less than 7 kW nett heat input (7.5 kW gross) may not need to be fitted with flame safeguard safety controls, subject to risk assessment.

9.1.2.6 Wherever practicable the gas/air ratio shall be controlled to ensure that rich

firing does not occur unless by design (as in the case of ceramic kilns (see

clause 9.1.5)). Note: Rich firing may lead to the production and leakage of CO into the teaching space should

there be a fault on the flue system.

9.1.3 Installation of gas-fired equipment

9.1.3.1 Equipment shall be installed, operated and maintained in accordance with the

manufacturer’s instructions. The instructions should include, where applicable:

guidance on the siting of the appliance


30

ventilation requirements

chimney/flueing requirements

operating instructions, including purging

maintenance instructions. Note: Further advice is given in BS 4163.

9.1.3.2 Further control measures may be required in specific circumstances. These

should be identified from risk assessment by the designer/installer. Appliances

not fitted with a flame safeguard device shall be manually supervised during

operation.

9.1.3.3 Any furnace or kiln should be sited away from general work areas and, where

practicable, be located in a separate room or area subject to the provision of

adequate supervision. It should be situated on a load-bearing floor.

Suitable protective measures shall be provided to protect persons being accidentally

injured by hot surfaces.

Plant controls shall be located in safe places.

9.1.3.4 There shall be adequate clearance between the equipment and the ceiling and

around the equipment to allow safe access for maintenance, servicing and the

free movement of air.

The floor, ceiling and walls adjacent to a kiln should be made of or covered with

a non-combustible material.

9.1.3.5 Combustible materials should not be stored near nor be allowed to accumulate

around any appliance.

9.1.3.6 Where a flame safeguard system is not fitted to any burner with an air fan, or

where oxygen is used an NRV must be fitted in the gas supply to the equipment

to prevent air or oxygen inadvertently entering the gas pipework.

9.1.4 Flues and fume extraction ductwork

9.1.4.1 Any flue or chimney shall be installed in accordance with the appropriate

requirements of IGEM/UP/10.

9.1.4.2 Any extract canopy over a gas appliance shall be constructed of appropriate

materials, for example of stainless steel. Any combustion gas extract duct from

furnaces and ovens should be treated as a flue, it’s routing and termination shall

be in accordance with IGEM/UP/10.

9.1.4.3 Flues/chimneys shall not pass through normally occupied spaces (such as

teaching spaces, offices, meeting rooms) within buildings unless enclosed within

sealed builders ducts ventilated externally to the building.

Boilers and air heaters shall not be installed in teaching spaces or in in spaces

accessible from teaching spaces.

Where these requirements are impractical, a carbon monoxide alarm system

shall be installed in the space unless other precautions can be taken as the

result of a risk assessment covering safety and environmental issues. Where CO

alarm systems are installed they shall comply with BS EN 45544 Part 3.

Note: UP/10 and BS 5440 include advice on the provision of means for access for inspection.


31

9.1.5 Special procedures for ceramic kilns

9.1.5.1 For certain glazes incomplete combustion is deliberately produced. In such

situations the degree of rich firing shall be properly controlled. The rich gas

firing part of the firing cycle shall only be permitted when the combustion

chamber temperature exceeds 750oC.

9.1.5.2 For a natural draught kiln where rich gas firing is produced by restricting the

flue-way, any shutter or damper used for this purpose shall not close the flue by

more than 70% of the cross-sectional area.

9.1.5.3 A CO detection system shall be installed for all fuel types. The detection system

should both raise an alarm and isolate the fuel supply to the burners.

9.1.5.4 Explosion relief panels should be fitted where flame protection is not installed or

rich gas firing is not controlled. Reference should be made to IGEM/UP/12.

9.1.5.5 A flame safeguard device capable of operating over the complete range of

lean/rich gas mixtures used to provide the required atmospheres shall be fitted

to any kiln that is left in operation unattended particularly overnight.

9.2 PORTABLE EQUIPMENT

9.2.1 Portable appliances include mobile benches, Bunsen burners and similar low

energy output appliances that can be connected to worktop taps and are under

operator supervision while in use. Normally a flame safeguard device is not

required for such equipment. Bunsen burners mounted directly onto gas cartridges (maximum content

0.45 kg) shall not be used unless secured to a worktop and stability is ensured.

9.2.2 Mobile LPG benches

9.2.2.1 The following minimum requirements should be applied to the design of mobile

benches used in teaching areas. Other designs may be permissible providing

safety is not adversely affected. Such deviations should be recorded in the Risk

Assessments.

Note 1: Commercial Butane or butane/propane mixtures are the preferred gases for these

applications.

Note 2: The preferred design for gas supplies to benches is that they shall be supplied from gas cartridges having a maximum capacity of 0.45kg and fitted with self-sealing threaded connections.

9.2.2.2 Gas connections shall either be metallic or dated flexible tubing complying with

BS 3212 (not exceeding 500 mm) and secured with permanent clamp type

fittings. Any internal gas pipework within a bench shall be located such that it is

not exposed to damage when in use.

If the gas storage is located within the bench:

be located within a separate enclosure

an LPG leakage alarm shall be located at low level within the bench

ventilation shall be fitted in the base and the top of the cupboard each of

200 cm2

combustible/flammable materials shall not be stored within the bench.

9.2.2.3 The cartridge should be securely mounted on the outside of the bench and

protected from impact damage.


32

9.2.3 Selection

Where applicable to the appliance type, any new equipment shall be CE marked.

9.2.4 Storage and siting of equipment

9.2.4.1 Equipment shall be stored, sited, operated and maintained in accordance with

the manufacturer's instructions.

LPG cartridges shall only contain commercial butane or commercial propane or

mixtures thereof and shall be of a type incorporating a self-sealing threaded

connection. Pierce-able cartridges shall not be used. LPG cartridges shall not

exceed 0.45 kg capacity.

9.2.4.2 LPG cartridges shall be checked for leakage before being stored and before use.

Small blowtorches must only be used in safe locations where there is no risk of

fire or explosion (e.g. presence of flammable gases or liquids).

Heatproof gloves should be available for handling the work. Blowtorches shall

ONLY be dismantled (e.g. to change burner nozzles or replace cartridges) by, or

under the supervision of a competent person and ONLY in a well ventilated area

away from sources of ignition.

LPG cartridges shall be stored in a ventilated locked cabinet of non-combustible

materials with at least 30 minutes fire resisting construction, secured in position

and kept locked (see also clause 5.5). It should preferably be located outside

the building or shall be adequately ventilated at both high and low levels directly

to outside the building and have explosion relief provision or gas leakage

detection alarms. Stored cartridges shall not exceed 7.5 kg in total and shall not

be stored in the same space as flammable materials or liquids.

Burners directly attached to gas cartridges shall be removed to secure storage

after use in a place which is: secure (e.g. locked); well-ventilated, away from

ignition sources, combustible materials and escape routes, in a safe position or

in a fire-resistant structure. Gas cartridges shall be removed to secure storage

during holiday periods.

9.2.4.3 Cylinders stored in buildings should not be located near exits, stairways used for

the safe egress of occupants.

9.2.4.4 Equipment should be securely stored away from the general work areas. Note: Ideally, equipment would be located in a separate room or area.

9.2.5 Use of equipment

9.2.5.1 At least once a year all equipment shall be subjected to a detailed inspection

and checks to ensure no gas leakage.

9.2.5.2 LPG cartridges shall be checked for leakage after use.

Note: See CLEAPSS document MRAT 1.018 and CLEAPSS publication L164, Portable Laboratory

Gas Burners.

Small LPG cartridge blowtorches shall only be used in safe locations where there

is no risk of fire or explosion. (e.g. presence of flammable gases or liquids).

Heat proof gloves should be available for handling the work. Blowtorches shall

ONLY be dismantled (e.g. to change burner nozzles or replace cartridges) by

competent persons and ONLY in a safe location.


33

9.2.5.3 User refillable LPG blow torches/burners shall only be refilled by competent

persons and in the open air away from any ignition source. Protective clothing

and eye protection shall be worn as advised in the manufacturer’s instructions.

Note: LPG liquids can cause severe cold burns.

9.2.5.4 Combustion equipment shall be stable in use and not pose a safety risk to

persons.


34

SECTION 10 : FOOD TECHNOLOGY ROOMS

10.1 These spaces are generally categorised as those for vocational training

(generally part of career training) and as food rooms (generally as part of

normal education). Any gas fired cooking appliance shall be installed in

accordance with its relevant installation Standard, for example BS 6172,

BS 4163 and BS 6173. Note: Food rooms will normally contain domestic appliances whereas commercial catering

appliances may be found where vocational training takes place.

10.2 Any new gas appliance shall be CE marked and shall incorporate an ignition

device on all its burners.

10.3 Any oven or similar enclosed burner equipment shall incorporate a flame

safeguard device.

10.4 Each area containing a gas cooking appliance shall be provided with adequate

ventilation for the safety of occupants and the gas appliance, see

Sub-Section 12 (for further advice, see BB101).

10.5 Where LPG blowtorches are used, refer to Sub-Section 9.2.


35

SECTION 11 : INSTALLING APPLIANCES

11.1 The installation of any:

hot water boiler exceeding 70 kW heat input

steam boiler

storage water heater

warm air heater exceeding 70 kW heat input

LPG mobile cabinet heater;

shall be in accordance with IGEM/UP/10, BS 5440 Parts 1 & 2 and any additional

manufacturer’s instructions.

Installation of hot water boilers of between 70 kW and 1.8 MW net heat input

shall also be installed to BS 6644.

Where applicable to the appliance type, any new appliance shall be ‘‘CE’’

marked. Note: The location of a fuel fired heating appliance within a teaching area is not preferred. Small

LPG cabinet heaters complying with BS EN 449 may be used in emergencies for which adequate ventilation is essential.

11.2 Any radiant heater shall be installed in accordance with BS 6896, IGEM/UP/10

and any additional manufacturer’s instructions.

11.3 Any radiant tube heater shall be installed in accordance with BS EN 416-1,

IGEM/UP/10 and any additional manufacturer’s instructions.

11.4 Any commercial catering appliance shall be installed in accordance with the

manufacturer’s instructions and BS 6173.

11.5 Any domestic gas appliance shall be installed in accordance with the

manufacturer’s instructions and the relevant Standards shown in Table 1.

APPLIANCE TYPE STANDARD

Fires, convector heaters, fire/back boilers

and decorative fuel effect gas appliances

BS 5871-1, 2, 3, 4

Water heaters BS 5546

Central heating boilers BS 6798

Ducted warm air heaters BS 5864

Cookers BS 6172

Tumble dryers BS 7624

TABLE 1 - INSTALLATION STANDARDS FOR DOMESTIC APPLIANCES


36

11.6 Unless otherwise stated in the manufacturer’s instructions a free standing

domestic cooking appliance using a flexible connector shall be fitted with a

stability device secured positively to the rear of the appliance and to the fabric

of the building. Note 1: Typical devices are shown in Figure 13. In the arrangement shown the stability bracket is

adjusted to give the smallest practical clearance between the bracket and the bottom engagement slot in the rear of the appliance. The stability chain needs to be kept as short as practicable and fixed positively to the rear of the appliance and to the structure.

Note 2: Such devices are essential to minimise the risk of free standing cookers tipping over for

example by students pushing down on open drop down oven doors.

FIGURE 13 - METHODS OF PROVISION OF COOKER STABILITY

11.7 Where CO alarm systems are installed they shall comply with BS EN 45544: 3.

CO detection should not be regarded as a means to negate the obligation of the

educational establishment to ensure appliances and flues are maintained so as

to ensure an acceptable level of performance.

Note 1: An educational establishment is regarded as a workplace, it is acknowledged that not all domestic type detectors and alarms complying with BS EN 50291-1 will be suitable for these applications unless the manufacturer specifically warrants this and confirms it will at least alarm at the workplace exposure limits. The action taken when in alarm should be determined by the level of assessed risk and environmental conditions within the room or space to be protected.

Note 2: IGEM/UP/1101 details the actions to be taken by teachers when alarms sound.

Stability U-bolt

Wall or floor mounted stability brackets are available to provide a minimum practical space of 87 mm between the cooker and the wall.


37

SECTION 12 : VENTILATION AND FLUES

12.1 GENERAL

12.1.1 Ventilation shall be designed to provide adequate ventilation for occupants and

to dilute fumes and water vapour generated from combustion processes, for

example during use of Bunsen burners, LPG blow torches and cooking.

12.1.2 Purpose provided permanent ventilation shall be fitted to provide sufficient fresh

air for combustion and climate control for all gas appliances used for educational

purposes. It may also be necessary to remove noxious fumes and control

condensation. Where Type A gas fired appliances are in use a maximum CO2

level of 2800 ppm, is considered acceptable. Note 1: BS 5440-2 may also be used for guidance purposes for small domestic sized installations. Note 2: Advice is also given in DfE publication BB101 – Guidelines of ventilation, thermal comfort

and indoor air quality in schools. As part of the design specification for educational premises ventilation is also required to limit the concentration of CO2 in all teaching and learning areas.

Where it is necessary to leave a door or window open during operation of heat

producing appliances such as kilns then, for additional climate control CO2

monitoring of the environment shall be installed.

High levels of CO2 in spaces containing Type A gas fired appliances shall cause a

visual or audible alarm at 2800 ppm. For new and refurbished installations, high

levels of CO2 shall also cause an alarm at 2800 ppm and shut down of the gas

supply/appliances at 5000 ppm.

12.1.3 For a new installation, if a mechanical system is used for gas safety purposes in

teaching areas to either extract the products of combustion or to provide

combustion air, means shall be provided to monitor the correct provision of air

supplies, for example by air flow monitoring using air pressure switches or, by

fan motor power monitoring. Failure shall lead to shut-down of the gas supply or

burners.

12.1.4 A canopy hood and duct, to extract excess heat to atmosphere, should be fitted

to all gas kilns. Where reasonably practicable the ducting should lead to the

outside of the building in as short and direct a route as possible. The effect on

the operation of the appliance of mechanical ventilation, extraction fans, air

recirculation fans and canopy hoods/ducts shall be considered. The appliance

shall be tested with a number of relevant ventilation scenarios.

12.1.5 If mechanical ventilation is provided for climate control only, provision of an

interlock shall be considered as part of a risk assessment.

12.1.6 Any extract ventilation system shall not adversely affect the safe operation of

any Type B appliance. Note 1: This includes appliances in adjacent spaces, for example boiler rooms with connecting

doors into a catering area. Note 2: “Flued appliances” includes open flued appliances, gas tumble dryers with external vents.

12.1.7 Ventilation shall be designed to provide adequate ventilation for occupants and

to dilute fumes and water vapour generated from combustion processes, for

example during experiments using Bunsen burners, LPG blow torches and

cooking.

12.1.9 Any ventilation system in a teaching area shall be designed not to exceed noise

levels of given in Building Bulletin 93 available


38

https://www.gov.uk/government/publication/bb93-acoustic-design-of-schools-

performance-standards.

Note: Additional information is available in BB93.

12.2 FLUES

12.2.1 Gas appliances shall be fitted with a flue system complying with BS 5440 Part 1

or IGEM/UP/10.

Canopy and/or flue systems shall be applied to appliances located in Art, Craft,

Design and Technology areas that may exhaust offensive or dangerous odours,

CO and other potentially dangerous gases. Such appliances will include forges,

ceramic kilns, melting furnaces. See IGEM/UP/10 and the manufacturer’s

installation instructions. Where odours and exhaust gases may cause a nuisance

special attention needs to be given to flue termination and the potential need for

gaseous incinerators.

Note: Consideration of noise impact on teaching areas may be needed when selecting canopies

and/or extraction systems.

12.2.2 For a natural draught kiln, where rich gas firing is produced by restricting the

flue-way, any shutter or damper used for this purpose shall not close the flue by

more than 70% of the cross-sectional area.

12.2.3 Where there is a draught diverter in the flue and under fault conditions,

products of combustion could enter the room the installer shall recommend that

regular checks be undertaken to ensure the effectiveness of the flue and the

ventilation of nearby spaces.

12.2.4 Any ducted exhaust system from equipment shall be connected to a permanent

exhaust discharge system. Where this is not practicable the exhaust shall not

discharge gases in such concentrations that may lead to danger to any person.

The provision of ventilation shall be in accordance with the equipment

manufacturer’s instructions.

12.2.5 Consideration shall be given to the location of fixed CO detection in rooms

through which the ductwork that contains combustion gases passes.

Where a horizontal or vertical flue passes through a teaching/occupied area, a

CO detection system shall be fitted and designed to cause an alarm condition.

This does not apply to chimneys/flues contained within sealed vertical ventilated service ducts (fire compartment) that are ventilated externally to the occupied

spaces.

Where CO detection systems are required by clause 7.2.5.5 or 12.2.4 they shall

comply with BS EN 45544: 3.

Note: IGEM/UP/10 also provides advice on pressure testing of linings.

12.2.6 The appliance manufacturer/designer shall be consulted prior to the installation

of a flue damper and where possible these shall be selected from those

specifically designed or intended for that make of appliance.

Any flue damper shall be installed in accordance with IGEM/UP/10 and shall be

maintained in good working order and its operation checked regularly.

It shall not be possible to completely close a damper controlling draught while

fuel is reaching the burner. Note: This can be achieved by cutting away part of the damper so that with the damper in the

fully closed position one third of the cross-sectional area of the flue remains open, by

https://www.gov.uk/government/publication/bb93-acoustic-design-of-schools-performance-standards

https://www.gov.uk/government/publication/bb93-acoustic-design-of-schools-performance-standards


39

fitting a stop that prevents the damper from being more than two thirds closed or by interlocking the damper operation with the fuel supply.

12.3 FOOD TECHNOLOGY

12.3.1 The ventilation system shall be such to ensure that, under normal conditions the

teaching environment with appliances operating, should not exceed 2800 ppm

of CO2 at 1.5 m above floor level with an automatic shutdown of the gas supply

at 5000 ppm.

The designer shall declare the design appliance operating conditions to meet

this CO2 level which information shall be contained within the site technical

file/handover documents.

12.3.2 Where a single catering cooker is installed in a food room with a total heat input

not exceeding 70 kW, the ventilation requirements shall comply with BS 5440-2.

Where practicable, the use of a cooker hood above the appliance is

recommended and if mechanical extract ventilation is installed clause 12.3.4

shall be applied.

12.3.3 For installations of multiple catering appliances in a vocational training area, the

ventilation shall comply with BS 6173 and shall be interlocked as specified in

IGEM/UP/19.

For existing installations in food technology (home economics) rooms exceeding

one domestic cooker, where the ventilation requirements for new installations

cannot be met, CO2 monitoring shall be fitted. It shall provide an alarm condition

at not more than 2800 ppm to warn the teaching staff to increase ventilation

and where practicable, an automatic shutdown of the gas supply at 5000 ppm.

12.3.4 Where mechanical supply and/or extract ventilation is used in conjunction with

Type A flueless cooking appliances (typical gas cookers) a means shall be

provided to monitor the correct provision of air supplies, for example by air flow

monitoring using air pressure switches; by fan motor power monitoring or by

CO2 monitoring. Failure shall lead to shut-down of the gas supply to the

cooker(s) (see IGEM/UP/19).

A valve proving system, shall be fitted where an automatic isolation is installed

and flame safeguard devices (FSDs) are not fitted to all appliances.

12.3.5 Canopies applied to catering appliances in vocational training areas shall be

constructed from non-combustible materials and fabricated so as not to

encourage accumulation of dirt or grease, nor allow condensation to drip from

the canopy. Their design shall provide suitable access for cleaning and grease

filter cleaning/replacement (see BESA specification DW/172). Experience will

indicate how often cleaning is needed.

12.3.6 The design and performance of canopies shall ensure as far as practicable, the

efficient removal of cooking fumes and as far as possible, prevent them from

passing through the breathing zone of the students and teaching staff.

Note: When designing food technology canopy locations the sight lines need to be considered for

teaching staff and students.

12.3.7 Canopies above domestic cooking appliances should be designed to have a flow

rate exceeding 150 m3/h (42l/s) per appliance. Canopies above 2 or more

commercial cooking appliances should be designed according to DW/172.

The amount of air to extract via the canopies should be calculated, for example,

the air velocities over the hood face specified for individual items should be

added up to give the total air movement. Further advice is available in DW/172.


40

12.3.8 Where canopies are not used for example ventilated ceilings, the ventilation

rates shall be calculated by a competent designer taking account of room sizes

and usages. Note: Additional information can be found in BB101 and CLEAPSS guidance.

12.3.9 Extract and supply air ventilation systems shall not adversely affect the safe

operation of any flued type B appliance, including appliances in adjacent places

(for example boiler rooms with connecting doors into the catering area). Flued

appliances in this respect, includes open flued appliances, gas tumble dryers

with external vents and room sealed appliances regardless of fuel.

12.3.10 Where CO2 monitors are employed as part of the ventilation control or alarm

strategy; the monitors shall be placed in an area that reflects the general CO2

levels within the gas cooker working area. Typically, they should be fitted

horizontally between 1 m and 3 m from the cooking areas and approximately

2.5 m above floor level. They should not be located in high velocity air streams

such as close to the edge of a canopy or adjacent to an air supply or extract

position.

12.4 SCIENCE LABORATORIES – ADDITIONAL REQUIREMENTS

12.4.1 The ventilation system shall be able to dilute combustion exhaust gases to an

acceptable level. Note 1: Simple measurements of gas consumption indicate that a Bunsen burner typically uses

2 litres of methane per minute. A litre of methane, if burnt with an adequate supply of oxygen, produces a litre of CO2.

Note 2: In ten minutes a Bunsen burner will generate 2 x 10 x 10-3 m3 = 0.02 m3 of CO2.

Therefore, 15 Bunsen burners will produce 0.3 m3 of CO2.

12.4.2 In most laboratories and preparation rooms, some form of mechanical

ventilation should be required at least some of the time to deal with pollutant

loads, the heat gain and water vapour produced by Bunsen burners as well as

other equipment and solar gains.

System design to deal with pollutants generated by science experiments

conducted in the open laboratory should assume a room volume of 200 m3 and

at a minimum exhaust flow rate of 4 l/s/m2 for a typical science laboratory.

However, if the ceiling height is lower than 2.7 m, a higher ventilation rate

should be required to achieve the same air change rate.

The design should wherever possible use the heat gains from occupancy and

equipment to warm the incoming air. Note 1: Hybrid mechanical/natural ventilation systems, rather than full mechanical ventilation

systems will probably be the most economical solution. Note 2: Risk assessments by CLEAPSS and the DfE have resulted in the minimum exhaust rates

given in BB 101 for science rooms. The rates depend on the floor area and the type of room.

12.4.3 Where ducted fume cupboards are used, there shall be an adequate supply of

incoming air to compensate for the extraction when the cupboard is in use. All

fume cupboards should be installed and used in accordance with the DfE BB101,

CLEAPSS Guide G9 and BS EN 14175 Part 2 guidelines.

12.4.4 For existing installations in science laboratories, where the ventilation

requirements for new installations cannot be met, CO2 monitoring shall be fitted.

It shall provide an alarm condition at not more than 2800 ppm to warn the

teaching staff to increase ventilation and where practicable, an automatic

shutdown of the gas supply at 5000 ppm.


41

Where CO2 monitors are employed as part of the ventilation control or alarm

strategy; the monitors shall be placed in an area that reflects the general CO2

levels within the laboratory. They should not be located in high velocity air

streams such as close to or adjacent to an air supply or extract position.


42

SECTION 13 : ELECTRICAL SUPPLIES AND WIRING

13.1 The electrical wiring installation to appliances shall comply with BS 7671 and

any specific requirements of the equipment manufacturer. See requirements to

satisfy DSEAR (see clauses 3.7 and 14.8). Note: Guidance can be found in IGEM/UP/16.

13.2 Any gas appliance and associated electrical components in the gas supply shall

be suitable for use with the supply voltage and have an adequate power rating

for the application.

13.3 Overload and fault protection systems shall have the correct rating for the

application.

13.4 Suitable methods of electrical isolation shall be provided in readily accessible

locations away from exposure to, damp surfaces, hot surfaces or combustion

products.

13.5 Appliances that need to be moved for cleaning shall be connected with plugs

and sockets.


43

SECTION 14 : TESTING, COMMISSIONING AND MAINTENANCE

14.1 Any person employed for testing, commissioning or maintenance must be

competent to carry out the work (see Section 4).

14.2 Gas installation pipework shall be tested, purged, and commissioned in

accordance with IGE/UP/1, IGE/UP/1A, IGEM/UP/1B, and BS 5482-1, as

appropriate.

14.3 Any domestic sized gas appliance shall be tested, commissioned and maintained

in accordance with the manufacturer’s instructions and the relevant Standard

(see clause 11.5 and Table 1).

14.4 Any non-domestic plant shall be tested, commissioned and maintained in

accordance with IGEM/UP/4, IGEM/UP/10 and the manufacturer’s instructions.

14.5 Maintenance shall be performed at any time that teaching or maintenance staff

consider it to be necessary. Tests shall be performed on a planned basis to

verify that the desired levels of CO2 are being achieved e.g. by using a simple

hand held instrument.

14.6 All gas appliances, pipework, single ventilation and flue systems shall be

maintained on a regular basis (see GS(I&U)R and PUWER) and the period

between such maintenance shall be no greater than one year unless specifically

stated otherwise in the manufacturer’s instructions.

During appliance maintenance, the correct operation of all controls and safety

devices shall be verified. It shall also be ensured that the appliance is in a safe

condition for use within a teaching establishment.

At least once a year, all portable equipment shall be subject to a more detailed

safety inspection to ensure no gas leakage. Note: Reference needs to be made to the manufacturer’s instructions.

The correct operation of all mechanical ventilation (supply and extract) systems,

ducted filter systems, interlocks and safety systems shall be verified during

maintenance. Interlock and safety systems shall be maintained at periods not

greater than those specified by the manufacturer, and shall be undertaken at

least annually.

14.7 Exhaust systems (other than flues within chimneys) shall be subject to regular

detailed inspection and service (typically annually and at least every 14 months)

to ensure no gas leakage and the system is working correctly.

14.8 The risk assessment shall be prepared to meet the requirements of DSEAR, this

will require inspection of joints on gas pipework and controls systems. Typically,

this will require an annual inspection of pipework using combustible gas leakage

detector or leak detection fluid. The application of regular pressure (tightness)

testing on an annual basis is not normally necessary and five yearly checks

should be adequate.

14.9 When testing ambient air concentrations, a suitably certified and calibrated gas

analyser shall be used. Reference should also be made to BS 7967-5 (in course

of preparation). Note 1: DSEAR is retrospective and requires every occupier of every commercial premises to

perform a risk assessment to demonstrate which if any parts of the system require the installation and use of equipment suitable for a hazardous area, normally referred to as Zone 1 or Zone 2.

Note 2: The requirements for maintenance of pipework systems can be found in IGEM/UP/2.


44

SECTION 15 : ADVICE TO BE GIVEN TO THE USER

15.1 The correct operation of any appliance and associated safety system shall be

demonstrated by the installer/commissioning engineer to a person having

responsibility for the safe operation of the equipment within the educational

establishment. Note: Detailed advice for the user is given in IGEM/UP/1101.

15.2 All user, installation and maintenance instructions provided by the manufacturer

shall be given to the responsible person and left on site. These shall form the

basis of any training and written start up, shut down and emergency procedures

and maintenance.

All instructions should be kept in a site manual/file.

15.3 Comprehensive written instructions, outlining the correct start up and shut down

procedures as well as those for the safe operation of any appliance (including

emergency procedures) and maintenance, should be clearly displayed in a

prominent position next to the appliance together with a list of those persons

responsible for it.

The “User Instructions” shall advise that persons who operate equipment shall

be trained to do so, or this shall be included in the displayed instructions as

above.


45

SECTION 16 : EMERGENCIES

16.1 Each teaching establishment shall prepare an Emergency Procedure to deal with

gas incidents in order to comply with health and safety Legislation.

16.2 Means shall be provided for the gas supply to a teaching area to be quickly

isolated in an emergency, either by an emergency stop facility or by closure of a

manual gas valve. Relevant staff shall be made aware of the location of all such

valves and how to operate them.

Note: Detailed advice for the user is given in IGEM/UP/1101.

16.3 Staff shall be made aware that any smell of gas shall be acted upon immediately

by system isolation, opening windows and doors and by NOT operating any

electrical switch/device. Staff shall be made aware that any continuing smell of

gas must be immediately reported to the gas emergency services e.g. 0800 111

999 for NG.

For potential escapes of LPG contact the supplier, this information typically is

provided on the vessel or adjacent to a storage vessel or recorded in the

emergency plan.

16.4 Where LPG is used, emergency procedures shall provide guidance on preventing

and dealing with liquid leakages, fire/explosion and cold burns.


46

APPENDIX 1 : GLOSSARY, ACRONYMS, ABBREVIATIONS AND UNITS

A1.1 GLOSSARY

All definitions are given in IGEM/G/4 which is freely available by downloading a printable

version from IGEM’s website www.igem.org.uk.

Recommended and legacy gas metering arrangements are given in IGEM/G/1 which is freely

available by downloading a printable version from IGEM’s website www.igem.org.uk.

A1.2 ACRONYMS AND ABBREVIATIONS

ACOP Approved Code of Practice

AECV additional emergency control valve

AIV automatic isolation valve

CDM Construction (Design and Management) Regulations

CE European Community

CLEAPSS Consortium of Local Education Authorities for the Provision of Science Services

CO carbon monoxide

CO2 carbon dioxide

CoP Code of Practice

COSHH

CSST

Control of Substances Hazardous to Health Regulations

corrugated stainless steel tube

DfEE

DSEAR

Department of Education and Employment

Dangerous Substances and Explosive Atmospheres Regulations

ECV emergency control valve

ESP emergency service provider

FSD

GB

flame safeguard device

Great Britain

GS(I&U)R Gas Safety (Installation and Use) Regulations

GS(M)R Gas Safety (Management) Regulations

GT gas transporter

HMSO Her Majesty's Stationary Office

HSE Health and Safety Executive

HSWA

HVCA

Health and Safety at Work etc. Act

Heating and Ventilating Contractors Association

IGEM Institution of Gas Engineers and Managers

LPG liquefied petroleum gas

MAM meter asset manager

MHSWR Management of Health and Safety at Work Regulations

MIP maximum incidental pressure

MOP maximum operating pressure

NG Natural Gas

NRV non-return valve

OP operating pressure

PE

PFI

PSSR

polyethylene

Private Finance Initiatives

Pressure Systems Safety Regulations

PUWER Provision and Use of Work Equipment Regulations

RIDDOR Reporting of Injuries, Diseases and Dangerous Occurrences Regulations

SP set point

SSOV safety shut-off valve

STP strength test pressure

UK United Kingdom

UKLPG UKLPG.

http://www.igem.org.uk/

http://www.igem.org.uk/


47

A1.3 UNITS

l/s/m2 litres per second per square metre

cm2

dB

kW

L

square centimetre

decibel

kilowatt

litre

L s-1 litre per second

mm

m

m3

m3 h-1

mbar

mol

mol m3 h-1

m s-1

MJ m-3

millimetre

metre

cubic metre

cubic metre per hour

millibar

mole

mole cubic metre per hour

metre per second

megajoule per cubic metre

Pa Pascal

ppm part per million

v/v volume per volume

A1.3 SYMBOLS

oC o

degree Celsius

degree

% percentage


48

APPENDIX 2 : REFERENCES

This Standard is set out against a background of Legislation in force in GB at the time of

publication. Similar considerations are likely to apply in other countries and reference to the

appropriate national Legislation will be necessary.

This Appendix lists all Legislation, standards, Codes of Practice and related recommendations

referenced in this Standard, as well as other items of Legislation that may be applicable.

A2.1 STATUTORY INSTRUMENTS

Consumer Protection Act 1987

Gas Act 1995

Health and Safety at Work etc. Act 1974

Asbestos (Prohibition) Regulations 1992

Building Regulations for England and Wales 2002

Building Standards (Scotland) Regulations 1990

Building (Amendment) Regulations (Northern Ireland) 2006

Confined Spaces Regulations 1997

Construction (Design and Management) Regulations 2015

Control of Asbestos Regulations 2006

Control of Substances Hazardous to Health Regulations 1994

Dangerous Substances and Explosive Atmospheres Regulations 2002

Electricity at Work Regulations 1989

Gas Appliances (Safety) Regulations 1995

Gas Cooking Appliances (Safety) Regulations 1995

Gas Safety (Installation and Use) Regulations 1998

Gas Safety (Management) Regulations 1996

Heating Appliances (Fireguards) Regulations 1991

Management of Health and Safety at Work Regulations 1992

Pressure Equipment Regulations 1999

Pressure Systems Safety Regulations 2000

Provision and Use of Work Equipment Regulations 1992

Reporting of Injuries, Diseases and Dangerous Occurrences Regulations

2013

School Premises Regulations 2012

The Education (Independent School Standards) England Regulations 2003

Water Supply (Water Fittings) Regulations 1999

Workplace (Health, Safety and Welfare) Regulations 1992.

A2.2 HSE APPROVED CODES OF PRACTICE AND GUIDANCE

CAIS10 Ventilation of kitchens in catering establishments

HSR25 Electricity at Work Regulations. Guidance

HSG48 Reducing error and influencing behaviour

HSG227 A comprehensive guide to managing asbestos in premises

HSG258 Controlling Airborne Contaminates at Work

L21 Management of Health and Safety at Work. ACOP and

Guidance

L22 Safe Use of Work Equipment. ACOP and Guidance


49

L56 Safety in the Installation and Use of Gas Systems and

Appliances. ACOP and Guidance

L64 The Health and Safety (Safety Signs and Signals)

Regulations 1996. Guidance

L73 Reporting of injuries, Diseases and Dangerous Occurrences

Regulations. Guidance

L80 Gas Safety (Management) Regulations. Guidance

L101 Safe work in confined spaces

L122 Safety in pressure Systems. Pressure Systems Safety

Regulations 2000. ACOP

L127 The management of asbestos in non-domestic premises.

ACOP

L138 Dangerous Substances and Explosive Atmospheres

Regulations 2002. ACOP and Guidance

L143 Working with materials containing asbestos. ACOP and

guidance

L153 Construction (Design and Management) Regulations 2015.

Guidance.

INDG178 Written Schemes of Examination

INDG229 Using Work Equipment Safely

INDG258 Controlling airborne contaminants at work

INDG261 Pressure Systems - safety and you

INDG291 Simple guide to the Provision and Use of Work Equipment

Regulations

INDG370 Fire and explosion; How safe is your workplace? A short

guide to the Dangerous Substances and Explosive

Atmospheres Regulations 2002

PM5 Automatically Controlled Steam and Hot Water Boilers.

A2.3 BRITISH STANDARDS (abbreviated titles)

BS 669-1 Flexible hoses, end fittings and sockets. Specification

metallic flexible hoses for domestic appliances

BS 699-2 Flexible hoses, end fittings and sockets. Specification for

corrugated metallic hoses for catering appliances

BS 1552 Taper plug valves

BS 4163 Health and Safety for Design and Technology in Schools

and Similar Establishments - Code of Practice

BS 4250 Commercial butane and commercial propane

BS 4800 Specification for paint colours for building purposes

BS 5440 Flues and ventilation

Part 1: Flues

Part 2: Ventilation

BS 5482 Butane and propane gas burning installations

BS 5546 Installation of hot water supplies for domestic purposes

BS 5864 Installation and maintenance of gas-fired ducted air

heaters

BS 5871 Installation and maintenance of gas fires

BS 6172 Installation of gas cookers

BS 6173 Installation of catering appliances

BS 6400 Domestic gas meter installations


50

BS 6501 Strip-wound hoses and assemblies

BS 6644 Installation of gas fired hot water boilers between 70 kW

and 1.8 MW net heat input

BS 6798 Installation of gas fired boilers not exceeding 70 kW

BS 6891 Installation of low pressure gas pipework of up to 35 mm

diameter

BS 6896 Installation of gas fired overhead radiant heaters

BS 7624 Installation of tumble dryers

BS 7671 IEE Wiring Regulations

BS 7967-5 Measurement of carbon monoxide and carbon dioxide and

the performance of gas fired equipment

BS EN 161 Automatic shut-off valves

BS EN 416-1 Single burner gas-fired overhead radiant tube heaters for

non-domestic use

BS EN 437 Test gases, test pressure, appliance categories

BS EN 676 Automatic forced draught burners

BS EN 13792 Colour coding of taps and valves for use in laboratories

BS EN 14800 Corrugated safety metal hose assemblies for domestic

appliances

BS EN 15069 Safety gas connection valves for metal hose assemblies for

domestic appliances.

A2.4 IGEM

IGE/UP/1 Strength and tightness testing and direct purging of

Edition 2 industrial and commercial gas installations

IGE/UP/1A Strength and tightness testing and direct purging of small

Edition 2 low pressure industrial and commercial Natural Gas

installations

IGEM/UP/1B Tightness testing and purging of domestic sized Natural

Edition 2 Gas installations

IGEM/UP/2 Gas installation pipework, boosters and compressors on

Edition 3 industrial and commercial premises

IGEM/UP/4 Commissioning of gas fired plant on industrial and

Edition 3 commercial premises

IGEM/UP/10 Installation of gas appliances in industrial and commercial

Edition 4 premises

IGEM/UP/1101 Guidance on gas installations for the management and

staff within educational establishments

IGEM/UP/12 Application of burners and controls to gas fired process

plant

IGEM/UP/19 Design and application of interlock devices and associated

systems used with gas appliance installations in

commercial catering establishments

IGEM/GM/6 Specification for LP diaphragm and RD meter installations

with capacities exceeding 6 m3 h-1 but not exceeding

1076 m3 h-1

IGE/GM/8 Non-domestic meter installations, capacity exceeding

Part 1 6 m3 h-1 and inlet pressures not exceeding 38 bar

IGEM/GM/8 Non-domestic meter installations. Locations, housing and

Part 2 compounds. Edition 2


51

IGEM/GM/8 Non-domestic meter installations. Fabrication, installation,

Part 3 testing and commissioning. Edition 2

IGEM/GM/8 Non-domestic meter installations. Operation and

Part 4 maintenance. Edition 2

IGEM/GM/8 Non-domestic meter installations. Notices and labels.

Part 5 Edition 2

IGE/SR/25 Hazardous area classification of Natural Gas installations

IGEM/SR/29 Dealing with gas escapes

IGEM/TD/13 Pressure regulating installations

IGEM/G/4 Definitions for the gas industry

IGEM/IG/1 Standards of training in gas work.

A2.5 UKLPG note that text uses Cop not CoP

UKLPG CoP 1 Design installation and operation of vessels located above

ground

UKLPG CoP 7 Storage of full and empty LPG cylinders and cartridges

UKLPG CoP 22 LPG Piping system design and installation

UKLPG CoP 24 Use of LPG cylinders

UKLPG CoP 25 LPG Storage and distribution systems

UKLPG TM 62 Checking LPG pipework (withdrawn).

A2.6 DEPARTMENT FOR EDUCATION ENGLAND

Building Bulletin 80 Science Accommodation in Secondary Schools. A

Design Guide, School Building and Design Group,

DfES

Building Bulletin 81 Design and Technology Accommodation in

Secondary Schools, DfES

Building Bulletin 100 Design for Fire Safety in Schools, School Building

and Design Group, DfES

Building Bulletin 101 Guidelines on ventilation, thermal comfort and

indoor air quality in schools Ventilation of School

Buildings

CLEAPPS Guide G225 Local exhaust ventilation in Design & Technology

CLEAPPS Guide G9 Fume cupboards in Schools, School Building and

Design Group, DfES. Note: These bulletins are available at http://www.cleapss.org.uk

A2.7 OTHERS

Health and Safety: Responsibilities and Powers. DfES

Compliance monitoring in Local Authority Premises, Federation of Property

Societies.

http://www.cleapss.org.uk/secfr.htm


52

APPENDIX 3 : DIVERSITY

IGEM/UP/2 permits pipework designers to apply diversity when sizing pipework systems. It

does however retain the caveat that the design needs to be such as to ensure the safe

operation of all appliances. Diversity is an issue for multi-appliance systems and is widely used

by Distribution companies when designing gas mains systems to housing estates.

In teaching establishments, diversity may be an issue with regards pipe sizing in supplies to

laboratories and domestic cooking areas where not all gas appliances will operate at any one

time and even then they will not operate at full load. There are no definitive rules for

designing with diversity. In a teaching area, account will need to be taken of the maximum

number of students present as well as the numbers of points of use.

It has to be remembered that the difference in installed cost between a 40 and a 50 mm pipe

are small in which case diversity may not lead to any real savings.


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