150519 as1668 part 1 presentation
TRANSCRIPT
REVISION TO AS 1668 PART 1 – DON’T BE CAUGHT OUT
AS 1668 PART 1 - 2015
PROPOSED CHANGES AND FEEDBACK OPPORTUNITY
Speakers: Simon Hill, Brett Fairweather & Ross Warner
Tonight’s Program
• Introduction to Presenters
• Revising a Standard – The Process
• Why revise AS1668.1?
• What are the Key Changes?
• Section by Section Overview
• Q&A Session
TH
EP
AN
EL
•Chairman Main Committee ME-062
•Member AS 1668.1 sub-committee
•30 Years Experience in the Mechanical Building Services Industry
•Director Engineered Environments
•Connoisseur of classic cars
•Member AS 1668.1 sub-committee (CIBSE Representative)
•17 Years Experience in the Mechanical Building Services Industry
•Associate with WSP | Parsons Brinkerhoff’s mechanical building services team
Ross Warner
•Chairman AS 1668.1 sub-committee
•Over 40 Years Experience in the Mechanical Building Services Industry
•Life Member of the Australian Institute of Air-Conditioning Refrigeration & Heating (AIRAH)
•Member AIRAH NSW Division Committee
•Principal of Professional Engineering Solutions
Simon Hill
Brett Fairweather
3
REVISING A STANDARD – THE PROCESS
BUT, WHY DO WE NEED STANDARDS?
• To add red tape to building regulations?
• To protect an already over-protected society?
• So I can make an income training the HVAC industry?
• Ours is a multi-disciplinary industry needing varied
engineering skills, applied to vastly different projects
• These skills are often only used once or twice a year
• Re-inventing the wheel on every job is not efficient
PERHAPS BECAUSE
THE IDEAL STANDARD
Standards provide knowledge distilled from the whole
industry, to guide, not stifle, individual practitioner’s
ideas, so the community’s expectations are met in the
most time & cost-efficient manner
USE PUBLIC COMMENT TO ADD YOUR EXPERTISE
During a building fire, use dedicated HVAC equipment
or, where possible, existing equipment to protect
building occupants and fire fighters, by preventing the
spread of smoke and keeping escape paths smoke-free
RELIABLY
THE IDEAL AS 1668.1
WHY REVISE THE STANDARD?
Black holes between NCC & 1998 edition:
• Non-sprinklered car park. What activates car park
ventilation in fire mode?
• Do car park exhausts need fire dampers?
• Is essential services power supply required for car
park fans?
• How do you test stair pressurisation in buildings
without Smoke Control systems?
• How many stair doors must be open in a car park?
WHY REVISE THE STANDARD?
Many different (legal?) interpretations:
• The NCC requires “Zone Smoke Control” but the
Standard only specifies Zone Pressurization?
• Do zone pressure differentials apply between all
parts of a multi-classification building, or only the
Class 5 parts?
• In buildings under 25 metres, does NCC require
compliance with AS 1668.1 Sections 2 & 3?
• Electrical authorities (sometimes) require fire rated
enclosures for essential switchboards, wiring &
vari-drives in fire-rated plantrooms?
WHY REVISE THE STANDARD?
General updating of a 17 year old Standard:
• To remove arguments between fire & mechanical
designers/contractors
• Why not put ALL the HVAC-based fire & smoke
control methods into one Standard?
• To allow for the soon-to-be-updated FD standard
• Specify “baseline data” requirements for AS 1851
• Can we use the BMS for fire & smoke control?
• To eliminate questionable alternative solutions by
explaining what sub-ducts are for
• To remove typographical errors
KEY CHANGES TO THE STANDARD
• Detection, Control & Indication now removed from
AS 1668.1 and put in AS 1670.1
• Included relevant parts of AS 1668.3 in AS 1668.1
• Includes reference to earthquake resistance
• Added “baseline data” requirements for AS 1851
• After liaison with EL 001, clarifies requirements for
fire rated wiring & switchboards in plantrooms
• Car park ventilation not a smoke control system,
but MUST run on fire alarm
• No fire dampers in fire pump ventilation systems
• Kitchen exhausts MUST run in fire alarm
SECTION 1
GENERAL
• Revised Scope & Objectives. Now includes multi-
compartment & large, single-compartment buildings
• Broader Objectives includes protection of openings
• Many new definitions:
• Air Damper – Neither a fire nor smoke damper
• Baseline data – For ongoing building management
• Fire detection, control & indicating equipment
(FDCIE) What we used to call the FIP & FFCP
• Smoke control zone – Defined to suit single
compartment & multi-compartment buildings
• Zone Smoke Control means Zone Pressurization
SECTION 2
AIR HANDLING SYSTEMS
• Reinforces Clause B1.2 of NCC by requiring smoke
control supports & mounts to resist earthquakes.
• Specifies Fire Dampers, Smoke Dampers & Air
Dampers must comply with AS 1682 Parts 1 & 2
• Permits delayed fan starts to avoid excessive loads
on damper motors (Might be extended to Smoke
Curtains & Proscenium Curtains?)
• Specifies safe & convenient access for filter
maintenance
• Notes that metal-faced sandwich construction does
not include foil faced insulation (Sisalation)
SECTION 3
FIRE PROTECTION OF OPENINGS
• Clarifies requirements for FRL insulation, when
protecting openings (Fire Dampers) in floors & walls
• Grille-to-grille fire dampers (FDs) in walls MUST
have FRL insulation
• Allows omission of FDs at some duct penetrations,
but shafts can’t be part of multiple compartments
• FDs must NOT be used at some duct penetrations:
• Diesel fire pump room ventilation
• Some fume cupboard exhaust systems
• Guidelines given for Alternative Solutions using
motorised dampers in lieu of subducts
SECTION 4
SMOKE CONTROL SYSTEMS
• Automatic Smoke Detection � AS1670.1
• Activation via sprinklers & MCP’s � AS1670.1
SECTION 4
SMOKE CONTROL SYSTEMS
SECTION 4
SMOKE CONTROL SYSTEMS
+ Fire-isolated exits
+ Smoke exhaust fans
+ Supply air fans
+ Minor exhausts
+ Major exhausts
+ Minor supply
+ Major supply
+ Carparks
+ Kitchen hood exhausts
+ Lift shaft pressurisation
+ Air control dampers
+ Smoke control dampers
SECTION 4
SMOKE CONTROL SYSTEMS
Documentation
• Design documentation requirements
• Baseline Data requirements
• As-built requirements
• Concise operating instructions
• Clear & concise schematic
• To be readily available at the site
SECTION 4
SMOKE CONTROL SYSTEMS
• “Smoke Spill” � “Smoke Exhaust”
• FFCP in (or adjacent to) FDCIE (formerly “FIP”)
• Wiring protection exemptions
• when enclosed entirely in fire-isolated plantroom
• where loss of voltage has no adverse effects
• Wiring clarifications – protection of isolation switches
• Performance validation – repeatable throughout life
• BMS clarification – AS1670.1 says no.
SECTION 5
MISCELLANEOUS SYSTEMS
• “Small systems” � “Single enclosures”
• Clarifications for multiple minor system openings
• Carparks:
• Dedicated main switch
• Jet fan requirements (not in series & shutdown)
• Fire isolation (use of fire dampers)
• Operation in fire mode clarified
• Fire separated exit pressurisation relief
SECTION 6
KITCHEN EXHAUST HOOD SYSTEMS
• Clarification for common systems
• Operation in fire mode – “shall not be shut down”
• Fan switch labelling
• Flame & spark arrestance
SECTION 7
SHUTDOWN SYSTEMS
• Generally only minor tweaks & clarifications
SECTION 8
ZONE PRESSURIZATION SYSTEMS
• Largely unchanged
• Upper limit reduced to 80 Pa
• Single fan permitted for multiple compartments
SECTION 9
HOT LAYER SMOKE CONTROL SYSTEMS
• The hot layer exhaust concept is new to AS1668.1
• These new requirements are a merge between
AS1668.3, NCC Specifications E2.2b and G3.8
(Atrium provisions)
• Removed the “Fire Engineering” from AS1668.3
• “Less helpful” parts of Spec. E2.2b have been made
more helpful and clarified. (“Plug-holing” is no longer
a hidden requirement, it is a detailed requirement with
a method of compliance included – Appendix A)
• Common items with rest of AS1668.1 (such as wiring,
fan construction, etc) now all in same document
SECTION 10
PROTECTION OF FIRE-ISOLATED EXITS
• Most significant change “s” is now “z”. Yes stair
pressurisation is now stair pressurization.
(presumably pronounced with an American accent?)
• A “black hole” in the 1998 edition has disappeared
over the event horizon. Air velocity test criteria for
doorways is now defined for all types of smoke control
• Mechanical relief from carparks must be designed as
a “Smoke Exhaust” system ONLY when the carpark
ventilation system serves multiple fire compartments
(by installation of fire dampers in fire resistant
walls/floors) and there is a likelihood that there will be
no relief for the stair pressurization system
• Otherwise mostly editorial changes.
SECTION 11
AIR PURGE SYSTEMS
• This is the easy one!
• There is essentially no change to the requirements
of this section from those in the 1998 edition.
• Why is it still there?
• Not currently referenced by the NCC.
• Could be useful as a reference for an alternative
solution for Fire Engineers or other users.
SECTION 12
LIFT SHAFT PRESSURIZATION
• This is another easy one!
• There is essentially no change to the requirements
of this section from those in the 1998 edition.
• Why is it still there?
• Not currently referenced by the NCC.
• Could be useful as a reference for an alternative
solution for Fire Engineers or other users.
Specifically, Lift Pressurization is being considered
by regulators as an aid to providing disabled egress
using the fireman’s lift.
Q & A
SAVE THE DATE:
TUESDAY 2ND JUNE
2015
‘SHEDDING SOME
LIGHT ON
ILLUMINATION
CHALLENGES’