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HAZARD U AREACLASSIFICATIONDS/EN 60079-10-1 & UK

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BACKGROUND – DS/EN 60079-10-1

–

• rec ve ore o e rec ve o s ore

• Danish Regulations (BEK 1480 + Guideline to that)

• Norway: PSA Facilities Regulation (Guideline) points towards IEC

61872-7 – which points towards IEC/EN 60079-10-1-

•

• Classify for flammable gasses, vapours and mists

• Flammability: Dependent on flash point and design/service

temperature

Probability for fire/explosion:

P(Release) x P(Ignition)

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AREA CLASSIFICATION – ZONING

EN 60079-10-1 / IP 15

Zone 0: The part of a hazardous area in which aflammable atmosphere is continuously present orpresent for long periods

Zone 1: That part of a hazardous area in which aflammable atmosphere is likely to occur in normal

Zone 2: That part of a hazardous area in which aflammable atmos here is not likel to occur in normaloperation, and if it occurs, it will only exist for a shortperiod

Non-hazardous: areas that do not fall into any ofthe above (IS NOT ‘SAFE AREA’)

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Definitions – EN 60079-10-1

• Source of Release: A point of location from which a gas, vapour,

mist or liquid may be released into the atmosphere so that an

explosive gas atmosphere could be formed.

• Grades of release: There are three basic grades of release, as

explosive gas atmosphere being present:

• Continous grade

• Primary Grade

• Secondary Grade

• Degree of ventilation (natural / artificial):

• Hi h ventilation VH

• Medium ventilation (VM)

•

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HAZARDOUS AREA CLASSIFICATION –

GRADE OF RELEASE – IP 15 DEFINITIONS

Continuous gra e re ease: A re ease t at is continuous or near y so, orthat occurs frequently and for short periods

If it is likel to be resent for more than 1000 hours er ear.

Primary grade release: a release that is likely to occur periodically oroccasionally in normal operations, i.e. a release which, in operating

procedures is anticipated to occurIf it is likely to be present for between 10 to 1000 hours per year.

Secondary grade release: A release that is unlikely to occur innormal operation and, in any event, will do so only infrequently and

. .anticipated to occur. Such release may be of unknown size e.g.fracture of a drain or unknown size e.g. corrosion hole.

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ZONE – VENTILATION – GRADE OF RELEASE

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Hazardous Area Classification Data Sheets

Part I: Flammable Material List and data

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Hazardous Area Classification Data Sheets

Part II: List of sources of release

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Hazardous Area Classification Drawings

EN 60079-10-1, SEC 7.2

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WHY COMBINE EN 60079-10-1 WITH IP15

• For continous & primary grades of release, the leak size is

typically known.

• We need some advise regarding size and types of leak sources for

secondary grade of release – EN 60079-10-1 is very open on the.

• e . to - - , . cope:

For detailed recommendations regarding the extent of thehazardous areas in specific industries or applications, reference

may be made to national or industry codes relating to thoseapplications.

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HAZARDOUS AREA CLASSIFICATION – IP 15

Risk Target is 10-5 year

For most offshore plants, where there is control of ignition sources

outside the hazardous areas, IP 15’s LEVEL I is applied

Does not concern major releases (spread of flamables morethan 30 m). These shall be minimised by design and operation

.

IP 15, sec. 5.4.5.1: “ As a guide, when there are more than 10 leak. .

overlap), the area should be classified as zone 2”

deg. C to the handling/ambient temperature in the area.

Followin : O en field naturall ventilated wind s eed 0.5 – 2.0 m s

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POINT SOURCE

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FLUID CATEGORY / CLASS

Fluid

Category

Description

A A flammable liquid that, on release, would vaporise rapidly and

substantially.

B A flammable liquid, not in Category A, but at a temperature

sufficient for boiling to occur on release.

C A flammable liquid, not in Categories A or B, but which can, onrelease be at a tem erature above its flash oint or form a

flammable mist or spray.

G(i) A typical methane-rich natural gas.

G(ii) Refinery hydrogen.

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FLUID CATEGORY - EXAMPLES

Fluid Category

Condensate / LPG: A

Crude / unstabilized: BCrude / stabilized: C

Wet/dry gas: G(i)

Diesel: C

Helifuel: C

Hydraulic oil: C

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RELATIONSHIP – CLASS & CATEGORY

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IP 15 PROCEDURE – SECONDARY GRADE

RELEASE

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IP 15 – LEVEL I, II & III – FLANGES & VALVES

For offshore oil/gas installations, where there is a strong control of

,

selected.

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CLASSIFICATION AT SPECIFIC EQUIPMENT

Fig 1A. Pump mounted on plated deck – high integrity pump (typically double mechanical seals)

HOLEDIA

FLUIDCAT.

PRESSUREBARG

RADIUSR1 R2

2 B 10

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Fig. 1B, Pump mounted on grated deck – high integrity pump (typically double mechanical seals)

HOLE FLUID PRESSURE RADIUSDIA CAT. BARG R1 R2

2 B P

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Fi . 2A Flan e valve installed over rated deck

HOLE

DIA

FLUID

CAT.

PRESSURE

BARG

RADIUS

R1 R2

1 A / C P

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Control valves, often used block valves and valves not well maintained: A zone 1=

A specific evaluation shall be made to decide if there is a further zone 2 around thezone 1.

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EN 1127-1, ANNEX BDefines equipment which are ”durably technically tight”,

• Canned motor pumps

examples:

• Magnetic coupled sealless pumps

• Ton ue roove flan es EN 1092-1 T e C & D

• If rarely detached: NPT connections (up to DN 50)

Should normally not cause classified areas.

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Seal Sealing Arrangement DescriptionMax. Release Flow Rate

(kg/s)

Hazard Radius R1/R2

(m)

John Crane recommendations for mechanical seal Maximum release flowrates for pumps in all fluid categories and process pressuresITA / Appendix 5:

Single

Single seal ( without fixed throttle

bushing, in a pump with no wear

rings). This may be a component or

cartridge, general-purpose seal

Use IP-15 calculation ( Hole

size. 0,23xshaft dia.)*See IP-15

Single

Single seal with a fixed throttle

bushing or a single seal in an API

610 pump. This may be acomponent or cartridge, general-

0,0003

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HAZARDOUS AREA DOSSIER

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ENCLOSED AREAS

• Minimum 12 ACH (IP 15), no stagnant zones to ensure area

classification will correspond to grade of release.

• Pressurisation to safe a room adjacent to classified area: Min. 5

mm WG overpressure (IP 15)

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