6 June 2014
Document Status
REVISION
STATUS
DATE
REV 0
Initial release to industry.
This Revision expired on 16 Sep. 2013
REV 1
Draft submission to ESDD
16 Sep 2013
REV 2
Draft resubmission to ESDD
29 Jan 2014
REV 3
Draft resubmission to ESDD
5 Mar 2014
REV A
Draft resubmission to ESDD
17 Mar 2014
REV B
Draft resubmission to ESDD
14 Apr 2014
REV C
For ESDD final approval for public release
16 Apr 2014
REV D
Approved by ESDD
6 June 2014
6 Sep 2013
ActewAGL Gas Service and Installation Rules
Table of Contents
1.
1.1
Scope ...................................................................................................................................................... 4
1.2
Gas Network boundary............................................................................................................................ 4
1.3
What the GS&I Rules cover ..................................................................................................................... 4
1.4
What the GS&I Rules do not cover ........................................................................................................... 4
1.5
Definitions ............................................................................................................................................... 5
1.6
Disclaimer ............................................................................................................................................... 9
1.7
Contact.................................................................................................................................................... 9
2.1
Scope .................................................................................................................................................... 10
2.2
Responsibilities of an ActewAGL authorised person............................................................................... 10
2.3
Meter Upgrades and Maintenance ........................................................................................................ 11
2.4
Delivery Pressure ................................................................................................................................... 11
2.5
Gas Connection labeling ........................................................................................................................ 11
3.1
ActewAGL’s Authority under the Act regarding customer connections .................................................. 12
3.2
Securing the gas connection .................................................................................................................. 12
3.2.1
Infrastructure location ...................................................................................................................... 12
3.2.2
By-pass .............................................................................................................................................. 12
3.2.3
Number of gas connections provided to a customer ........................................................................ 13
3.2.4
ActewAGL approval to connect to existing gas infrastructure .......................................................... 13
3.3
Locations for gas meter set installations ................................................................................................ 13
3.3.1
Domestic Meters .............................................................................................................................. 13
3.3.2
New industrial, commercial gas meter sets and high rise residential installations.......................... 13
3.3.3
Prohibited meter set locations ......................................................................................................... 13
3.4
Metering Equipment Enclosure Design .................................................................................................. 14
3.4.1
Type 1 enclosure ............................................................................................................................... 15
3.4.2
Type 2 enclosure ............................................................................................................................... 16
4.1
Appendix A: Scope of Gas Work............................................................................................................. 27
4.2
Appendix B - Domestic Gas Meter Location Reference Drawings ........................................................... 30
4.3
Appendix D- Scope of AS/NZS 4645.1 in Natural Gas Supply Chain ........................................................ 31
4.4
Appendix E – Signage ............................................................................................................................. 32
4.5.1 Type 1 Enclosures: Flammable Gas ...................................................................................................... 32
4.6 Zone 2 Hazardous Area ............................................................................................................................ 33
4.6.1 Type 2 Enclosures: Natural Ventilation.................................................................................................... 33
4.7
Zone 1 Hazardous Area .......................................................................................................................... 34
4.7.1 Type 2 Enclosures: Mechanical Ventilation .............................................................................. 34
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ActewAGL Gas Service and Installation Rules
These GS&I Rules are divided into three parts:
1. PRELIMINARY
2. ActewAGL OBLIGATIONS
3. CUSTOMER OBLIGATIONS
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ActewAGL Gas Service and Installation Rules
1 PRELIMINARY
1.1 Scope
These GS&I Rules are issued by ActewAGL under the requirements of the Gas
Service and Installation Rules Code, which was created on the 2-July 2013, under
the Utilities Act (ACT) 2000 (the Act). Section 25 (2) (a) (iv) of the Act requires a
licensed utility to comply with technical codes and standards.
Applicable standards for the installation of gas metering equipment include:

AS/NZS 4645

AS/NZS 5601

AS/NZS 60079
as published from time to time.
These GS&I Rules apply from the date of approval (as shown on front page of these
GS&I Rules).
1.2 Gas network boundary
The boundary between a Gas Distribution Network and a customer’s premises is at
the point of supply. The Gas Network Boundary Code (2013) removed the option of
the network boundary being at a different location to the point of supply from 28th
May 2013 and the network boundary is at the point of supply.
For existing gas meter set installations inside the customer’s building:
1) only a gas meter can be replaced in the existing location;
2) any alteration to the configuration of existing gas meter set installation, other
than the gas meter, will require the relocation of the gas meter set installation
to an external location in accordance with Clause 6.7 (1); and
3) No new gas meter set equipment shall be installed into an existing internal
gas meter set installation.
1.3 What the GS&I Rules cover
These GS&I Rules set out the requirements for the safe, reliable and efficient
connection, by all persons, of a gas connection service from a gas distribution
pipeline to a customer’s premise.
1.4 What the GS&I Rules do not cover
All work associated with the consumer piping downstream of the point of supply.
This is governed by legislation, codes or standards. The requirements for this work
can be found in the Gas Safety Act 2000 (ACT) and AS/NZS 5601.1 Gas
Installations.
The following items are performed by ActewAGL on its gas infrastructure in
accordance with its specifications and are not within the scope of these GS&I Rules:
(1)
Installation or modification of distribution pipelines
(2)
Installation or adjustment of regulator sets
(3)
Hot water meters for the purposes of water metering.
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ActewAGL Gas Service and Installation Rules
1.5 Definitions
The following definitions apply within this document:
the Act
The Utilities Act 2000 (ACT)
ActewAGL
ActewAGL Distribution (ABN 76 670 568 688), being the gas
distributor in the Australian Capital Territory. For the purpose of
these GS&I Rules, this definition includes ActewAGL’s approved
representative: Jemena Asset Management Pty Ltd
(ABN 53 086 013 461).
AS/NZS
When followed by numbers or letters AS/NZS means a standard
published by Standards Australia as current at the time, e.g.
AS/NZS 4645.1 Gas Distribution Networks.
breather vent
A breather vent as defined in AS/NZS 4645 (which calls up
AS/NZS 5601.1 Gas Installations)
builder
A person who provides, has provided or intends to provide (is
responsible for) the erection, alteration or demolition of a building.
BCA
Building Code of Australia
consumer piping
consumer piping is as defined within AS/NZS 5601.1 Gas
Installations
customer

customer contract

a person to whom the service is provided under a
customer contract; or
a person who has applied, orally or in writing, to the relevant utility
for the service to be provided under a customer contract.

a standard customer contract, made under the Act;

a negotiated customer contract, made under the Act; or

a customer connection contract, made under the National
Energy Retail Law.
distribution pipeline
Pipes used in the gas distributor’s gas reticulation
network to transport gas
enclosure
Any cage/structure/room where meter sets/regulator sets are
housed
gas connection
gas connection means a physical link between a distribution
pipeline and a point of supply to allow the flow of natural gas.
gas distributor

a utility licensed for the distribution of gas through a gas network;
or

in relation to a gas connection service for premises— a
utility licensed to provide the service for the premises.
ActewAGL is the gas distributor in the Australian Capital Territory.
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ActewAGL Gas Service and Installation Rules
gas retailer
An entity whose primary activity is the sale of gas to customers.
Gas Service and
Installation Rules
Code
The Gas Service and Installation Rules Code, which was created on
the 2-July 2013, under the Act.
GS&I Rules
The Gas Service and Installation Rules issued by ActewAGL under
the requirements of the Gas Service and Installation Rules Code.
gas work
Work on ActewAGL’s gas infrastructure
gasfitter
An entity that may be licensed to do gasfitting work under the
Gas Safety Act 2000 (ACT), i.e., Licensed gasfitter and an
Advanced Licensed gasfitter.
gasfitting work
Work as defined in the Gas Safety Act 2000 (ACT) as follows:

Work on consumer piping, or proposed consumer piping,
including the connection or disconnection of a gas appliance
(other than a gas appliance designed to be portable by users) to
or from the consumer piping; or

the inspection or testing of consumer piping; and

The installation, the connection or reconnection of the
consumer piping to the point of supply.
hazardous area
In accordance with AS/NZS 60079 a hazardous area is defined as
an area in which an explosive gas atmosphere is present, or may
be expected to be present, in quantities such as to require special
precautions in the design, construction, installation and use of
apparatus.
infrastructure
infrastructure as defined in the Utilities Act 2000 (ACT) (the
Act) means pipelines, meters, or any equipment (including
pressure control devices, excess flow valves, control valves,
actuators, electrical equipment, telemetry equipment, cathodic
protection installations, compounds, pits, buildings, signs and
fences).
This excludes pipework downstream of an agreed network
boundary, agreed to prior to the 28th May 2013, in accordance
with the regulations applying at the time of agreement.
kPag
kilopascals (gauge pressure)
legislation
The Acts, Regulations and all subordinate legislative instruments
pertaining to gas safety in the Australian Capital Territory as in
force from time to time.
MAOP
Maximum Allowable Operating Pressure
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meter control valve
A manually operated ball valve which is located on the end of a
service riser and which allows gas supply to a meter set/regulator
set to be shut off.
meter
A device or other apparatus used for measuring and recording the
consumption of gas.
meter set
meter set means a gas meter, and other ancillary equipment used
for measuring and regulating the gas pressure; or
installed metering equipment that may be kit-based or
prefabricated. Kit-based sets are installed on a meter bar whereas
prefabricated sets are mounted on an independent support frame.
metering
equipment
metering equipment means equipment necessary for
measuring and recording the consumption of gas. Metering
equipment encompassed in a meter set may include:

meter – a device or other apparatus used for measuring
and recording the consumption of gas

valves to isolate gas supply

pipework – including a combination of pipes, flanges, tees,
elbows and other pipe connecting equipment designed to convey
gas

fittings – including a combination of smaller instruments
and pressure sensing tubing and tube fittings, instrument
valves and associated equipment

filters – devices designed to trap and remove foreign
matter from gas streams

regulators to reduce and control gas pressure

over-pressure protection devices to protect downstream
equipment from exposure to excessive pressure (overpressure) in the event of upstream equipment failure

non-return valves to ensure gas flow travels in one direction
and to prevent reverse flow

mechanical indexes to indicate raw metered gas consumption

meter bar/support equipment designed to support the meter
and associated equipment,

electrical connections and wiring to convey electrical signals
for meters, flow correctors, alarms and metering
communications equipment

flow correction devices or software to enable (actual)
uncorrected metering data to be adjusted for effects of
temperature and/or pressure and/or gas quality and referenced
to standard pressure and temperature conditions

temperature and pressure correction devices or software to
enable raw (actual) uncorrected metering data to be adjusted
for effects of temperature and pressure

heating value analysis equipment and devices to
analyse and calculate the heating value of the gas
stream such as gas chromatographs or calorimeters.
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network boundary
The boundary between a gas distribution network and a
customer’s premises is at the point of supply, unless prior to 28
May 2013, an alternative boundary has been agreed to in
accordance with the regulations applicable at the time of
installation.
person
Person includes a natural person, a firm, an unincorporated
association or a body corporate;
point of supply
point of supply means the outlet of the meter set.
property boundary
The front boundary of the boundaries of a block as defined in the
deposited plan lodged with the Australian Capital Territory RegistrarGeneral’s office. This is usually the property line which divides the
customer’s private property from public areas, such as streets,
roads and lanes.
path valve
A valve situated approximately 225 mm outside the property
boundary at the inlet of the gas connection. It is usually below
ground in a path box for easy access, and is used to isolate the flow
of gas into the gas connection.
regulator set
Installed metering equipment, as defined under meter set but
does not include a meter.
secondary regulator
set
A regulator set supplied from ActewAGL’s secondary
distribution network (MAOP 1050 kPag)
secondary gas
connection
A gas connection supplied from ActewAGL’s
secondary distribution network (MAOP 1050 kPag)
secondary meter set
A meter set supplied from ActewAGL’s secondary
distribution network (MAOP 1050 kPag)
service riser
A vertical section of the gas connection which protrudes from the
floor of an enclosure or the ground
technical inspector
A technical inspector is appointed under section 67 of
the Utilities Act 2000 (ACT) and applies the
requirements of technical codes.
Technical Regulator
The Director-General of the Environment and Sustainable
Development Directorate (ESDD) or a delegated officer
Type 1 enclosure
External enclosure positioned outside the confines of a
building. The enclosure is typically constructed of wire
fencing, brick or concrete and is not covered by a solid roof
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Type 2 enclosure
Internal enclosure inside a building. The enclosure must be
externally accessible with no access to the remainder of the
building, and be covered by a solid roof.
utility service

the transmission of gas through a gas transmission network;
or

the distribution of gas through a gas distribution network; or

a gas connection service.
vented
The action achieved by a vent line.
vent line
A pipe connected to a pressure regulator breather vent, or relief
valve discharge, which conveys gas to a safe location.
ventilation
The process of an air change. In the case of metering equipment
in an enclosure, this corresponds to a flow of air displacing the
potential concentration build-up of gas.
1.6 Disclaimer
These GS&I Rules apply to ActewAGL’s infrastructure. ActewAGL accepts no
responsibility for any other use of these GS&I Rules.
1.7 Contact
Gas Customer Services can be accessed by ringing 1300 405 727.
There are then the following options:
1
For gas emergencies
2
Billing or account enquiries
3
Assistance in identifying Network components or DBYD enquiries
4
Move Network components including meters
5
New Connections
6
Licensed plumbers requiring technical advice
7
Other – Customer service.
W eb: www.actewagl.com.au
Web: www.environment.act.gov.au/energy
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ActewAGL Gas Service and Installation Rules
2 ActewAGL OBLIGATIONS
2.1 Scope
This Section outlines the obligations of ActewAGL for connection of customers to
ActewAGL’s infrastructure in accordance with the scope specified in Section 1.1 of
these GS&I Rules.
For works performed on ActewAGL’s gas infrastructure:
(1)
ActewAGL is responsible and liable under the Act for the outsourcing of
works to third parties regarding construction and maintenance of gas
connection services and gas connection equipment.
(2)
Any authorised persons engaged to perform works on ActewAGL’s gas
network must be trained and/or deemed competent by ActewAGL to
conduct the works. ActewAGL will maintain a list of authorised persons.
(3)
The competencies of these authorised persons must be
documented by ActewAGL, be current and be available for
inspection by a technical inspector under section 67 of the Act.
(4)
ActewAGL must take immediate action to rectify gas connection work,
at no cost to the customer or third party, if ActewAGL is in breach of its
GS&I Rules, industry and technical codes or the relevant Australian
Standards at the time of installation, and a customer or third party
suffers or may potentially suffer a loss.
2.2 Responsibilities of an ActewAGL authorised person
ActewAGL are responsible and liable under the Act for all work performed on the gas
network. ActewAGL may authorise/approve a person to perform work on their
infrastructure.
ActewAGL must ensure the authorised person meets the following requirements:
(1)
Supply sufficient information to ActewAGL so that ActewAGL can
authorise the work, and provide suitable equipment;
(2)
obtain authorisation for any gas work;
(3)
once authorisation is obtained, performing and / or supervise the gas
work;
(4)
ensuring all gas work, notifications and certificates are performed in
accordance with the Utilities Act 2000 and its Regulation;
(5)
confirm with ActewAGL that a gas distribution pipeline is
available with adequate gas supply and pressure before starting
work;
(6)
planning and performing the gas work;
(7)
perform the gas work to an acceptable level of competency and to
the satisfaction of ActewAGL;
(8)
correct all defects promptly when advised by ActewAGL;
(9)
take corrective action where an installation has been found to be
unsafe and ensuring the customer and ActewAGL are advised
immediately of the defect and the corrective action taken;
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(10) manage direct or indirect claims arising from damages to persons or
property through work performed by the authorised person, under the
person’s supervision and/or by the person’s employee’s;
(11) ensure that a gas connection is designed and installed so that all gas
conveyed through the installation is measured through the gas
distributor’s meter;
(12) An authorised person may decline to perform gas connection work
on behalf of ActewAGL should they believe that the instructions
and/or materials supplied by ActewAGL are insufficient to
successfully complete the gas connection works or should they
believe the work is beyond their level of training or competency’s.
2.3 Meter Upgrades and Maintenance
For existing gas meter set installations inside the customer’s building
(1)
only a gas meter can be replaced in the current locations; and
(2)
any alteration to the configuration of existing gas meter set
installations, other than the gas meter, will require the relocation of the
gas meter set installations to an external location as in section 3.3;
and
(3)
No new gas meter set equipment shall be installed into an
existing internal gas meter set installations.
Note: The replacement meter must be the same as the installed meter in design specifications.
2.4 Delivery Pressure
Depending upon connected gas load (appliances) and available supply pressure,
meter sets are issued with the following delivery pressures:
(1)
2.75 kPag +/- 0.05 kPa
(2)
5 kPag +/- 0.2 kPa
(3)
35 kPag +/- 1 kPa.
Regulator sets are issued with the following delivery pressure:
(1)
5 kPag +/- 0.2 kPa.
Other regulator set settings may be chosen by ActewAGL in specific cases.
During installation of a meter set or regulator set the delivery pressure into the
customer piping must be confirmed.
2.5 Gas Connection labeling
If the premises have sub-tenancies with separate gas connections given to separate
customers, ActewAGL will be required to mark and identify each gas connection.
The identification shall be placed on the gas connection equipment.
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ActewAGL Gas Service and Installation Rules
3 CUSTOMER OBLIGATIONS
This Section outlines the obligations of customers for connection to ActewAGL’s gas
infrastructure in accordance with the scope specified in Section 1.1 of these GS&I
Rules.
3.1 ActewAGL’s Authority under the Act regarding customer
connections
(1)
ActewAGL may refuse gas supply or resupply to a customer or may
disconnect the gas supply to the gas connection where compliance to
the gas distributor’s GS&I Rules has not been met.
(2)
ActewAGL may refuse to provide gas supply to a customer where the
customer piping installation has not been certified in accordance with
the Gas Safety Act 2000 (ACT).
(3)
Under these GS&I Rules, the customer is prohibited from upgrading,
modifying or relocating ActewAGL’s infrastructure up to the point of
supply. Such gas work must be performed by ActewAGL, or their
approved person authorised in accordance with ActewAGL’s
specifications in Section 2.2. However, all gas works performed by
persons on the gas connection service, from the existing gas
distribution pipeline to the outlet of the meter set, must have prior
approval by ActewAGL and must be deemed as acceptable by
ActewAGL upon completion.
(4)
All meter sets/regulator sets have their outlet pressure adjustments
sealed to prevent unauthorised adjustment. The regulator set and
settings must not be altered without prior approval from ActewAGL.
3.2 Securing the gas connection
3.2.1 Infrastructure location
The customer may be required to provide and maintain, on the customer’s premises
and at the customer’s expense, a location within the customer’s premises to
accommodate gas connection equipment for the benefit of gas supply.
The customer may be required to take the necessary measures for accommodating
the gas distributor's infrastructure if the gas distributor considers it necessary:
(1)
To prevent obstruction or diversion of the gas supply;
(2)
To avoid interference with the gas supply to other customers;
(3)
To secure the metering equipment for the purposes of gas supply.
3.2.2 By-pass
If an uninterrupted supply of gas is essential for customer operation, the gas
retailer must be notified at the time of requesting gas supply to enable ActewAGL
to determine the suitability of a meter set fitted with a permanent by-pass. Bypasses are usually installed for special requirements such as continuously operated
industrial or commercial processes, essential services, and public and large private
hospitals.
By-pass valves are sealed in the closed position and must not be operated.
ActewAGL authorisation must be obtained to operate an unmetered by-pass on a
meter set.
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3.2.3 Number of gas connections provided to a customer
ActewAGL may limit the number of gas connection services to one gas
connection for one building, or one group of buildings on the same parcel of land.
ActewAGL may consider it necessary to provide more than one gas connection
service to a large parcel of land with multiple connections, or where ActewAGL
agrees to a customer’s request to provide an additional gas connection to the
customer’s premises.
3.2.4 ActewAGL approval to connect to existing gas infrastructure
ActewAGL approval shall be obtained for connection to its existing gas
infrastructure. ActewAGL’s approval or disapproval will be in respect to
ensuring minimum gas supply to original or existing gas customers supplied
from a gas connection.
3.3 Locations for gas meter set installations
3.3.1 Domestic Meters
Domestic gas meters shall be installed externally and in accordance with the
approved locations identified in Appendix B - Domestic Gas Meter Location
Reference Drawings so that meters are safely accessible for maintenance and
reading.
3.3.2 New industrial, commercial gas meter sets and high rise residential
installations
(1)
ActewAGL’s gas meter set installations, which were installed after the
Gas Service & Installation Rules Code was introduced, must be
placed external to a customer’s building; and
(2)
An enclosure to house the gas meter set may be secured into the face of
the customer’s building; and
(3)
The enclosure must meet the relevant Australian Standards and
only be accessed via the external face of the customer’s building.
3.3.3 Prohibited meter set locations
In accordance to AS/NZS 4645.1 but subject to additional requirements of Section 3.4
of these GS&I Rules, meter sets/ regulator sets must not be installed in the
following locations:
(1)
a lift shaft or lift motor room; or
(2)
a room specifically intended for electrical switchgear; or
(3)
a fire-isolated stairway or passage; or
(4)
a fire hydrant duct or hose reel cabinet; or
(5)
a sprinkler or hydrant pump room; or
(6)
near a source of ignition; or
(7)
in a position that would obstruct egress from a building.
(8)
In a position where the meter set would be subject to physical damage
unless adequately protected. Specifically, physical protection for the
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metering equipment (including meters, regulators, filters, valves, meter
bars, exposed inlet piping and vent line) must be installed where the
meter set location is within one (1) metre of roads, driveways, car
parking areas, garages, loading docks etc., or other areas where there
is mobile plant, equipment or vehicles moving within one (1) metre of
the meter location.
(9)
In an area where excessive temperatures or sudden excessive changes
in temperature may occur.
(10) In an area of excessive vibration.
(11) In the foundation area under a building.
(12) In a cavity wall, unless installed in a ventilated enclosure with external
access and the cavity is sealed (see Figure 1(e) & Figure 1(f)).
(13) In a position where access for meter reading or maintenance is restricted.
(14) In an unventilated position.
(15) On the ground, or on a floor which is frequently wetted, or on a
floor which contains material which may corrode the meter.
(16) Where a service riser is not separated from an earth electrode by
500 mm.
3.4 Metering Equipment Enclosure Design
This section details the requirements for the design of any enclosure intended to
house metering equipment. When directed by ActewAGL, enclosures must be
installed to prevent unauthorised access or damage to meter sets/regulator sets.
Two enclosure types are listed below in order of preference for industrial and
commercial installations. The building owner or representative shall provide
justification to ActewAGL at the building design stage for requesting an enclosure.
(1)
Type 1 enclosure - external enclosure positioned outside the confines
of a building. The enclosure is typically constructed of wire fencing, brick
or concrete and is not covered by a solid roof.
(2)
Type 2 enclosure - internal enclosure inside a building. The room
must be externally accessible with no access to the remainder of the
building, and be covered by a solid roof.
Schematic drawings of such enclosures are shown in Figure 1(c) to Figure 1(g).
No other equipment (e.g. water meters, pumps, compressors, fire hydrants) can be
placed within an enclosure unless authorised to do so in writing from ActewAGL.
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3.4.1 Type 1 enclosure
External Type 1 enclosures must comply with the following requirements, as
indicated in Figure 1(a) to Figure 1(d):
(1)
The location of the Type 1 enclosure must be approved by ActewAGL
at the site design stage.
(2)
Type 1 enclosure dimensions must be as indicated in the Figures,
or on ActewAGL supplied meter set/ regulator set site layout
drawings, whichever is the greater.
(3)
Type 1 enclosure clearance dimensions from piping must be as
indicated in the Figures or ActewAGL-supplied meter set/regulator set
site layout drawings, whichever is the greater.
(4)
The Type 1 enclosure must have two entry points located at different sides
of the enclosure as demonstrated in the Figures.
(5)
The Type 1 enclosure must (or as otherwise approved by ActewAGL)
be fitted with signage as in Appendix E - Signage. The design must
comply with AS/NZS 1319.
(6)
The Type 1 enclosure floor must be constructed of concrete and be
level, as demonstrated in the Figures.
(7)
Appropriate permanent safety barriers (e.g. Armco railing) must be
installed between a Type 1 enclosure adjacent to a vehicular traffic
path (see Figure 2 - examples of appropriate permanent safety
barriers).
(8)
The design and construction of the Type 1 enclosure must not restrict
natural ventilation such that any gas can freely escape.
(9)
The Type 1 enclosure must be fitted with an ActewAGL
supplied gas distribution padlock.
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3.4.2 Type 2 enclosure
Type 2 enclosures must comply with the following requirements as indicated in
Figures 1(e) to 1(g):
(1)
The location of the Type 2 enclosure must be approved by
ActewAGL at the building/site design stage.
(2)
The Type 2 enclosure must be situated by the external wall of a
building closest to where the gas connection enters the building,
unless specifically approved by ActewAGL.
(3)
The Type 2 enclosure to house the meter set/regulator set may be
secured into the face of the customer’s building.
(4)
The Type 2 enclosure must meet the relevant Australian Standards and
only be accessed via the external face of the customer’s building.
(5)
The Type 2 enclosure may be fitted with a single entry door where
maintenance activities can be undertaken on metering equipment
without the metering equipment impeding access to the Type 2
enclosure entry door. Examples of such Type 2 enclosures are shown
in the Figures. This requirement may be varied subject to specific
approval from ActewAGL.
(6)
The Type 2 enclosure must have adequate clearance for maintenance
work to be performed. Clearance dimensions in the Figures should be
used. This requirement may be varied subject to specific approval from
ActewAGL.
(7)
The Type 2 enclosure floor must be constructed of concrete and be level.
(8)
The Type 2 enclosure door(s) must (or as otherwise approved by
ActewAGL) be fitted with signage as in Appendix E - Signage as
classified in the Figures. The design must comply with AS/NZS 1319.
(9)
The Type 2 enclosure walls and door(s) must have the appropriate
Building Code Australia (BCA) fire rating.
(10) The meter set/regulator set must not be installed in a Type 2
enclosure containing an unsealed grease trap.
(11) All meter set/regulator set breathers/relief vents must be vented
outside the Type 2 enclosure according to the requirements in
AS/NZS 4645.1. This may require penetrations through the external
face of the customer’s building for vent line installation.
(12) Regulator breather/relief vent line terminal points should be
positioned such that gas discharge can be detected. The vent line
terminal points must be protected from rainwater and vermin ingress.
(13) The Type 2 enclosure’s ventilation must comply with AS/NZS 4645.1.
(14) Natural ventilation construction must not be of a type that restricts the
flow of natural gas to the outside of the Type 2 enclosure. The design
must take into account that natural gas is lighter than air to avoid gas
entrapment within the enclosure.
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(15) For Type 2 enclosures the following criteria applies:
a) The building owner or authorised representative must undertake a
hazardous area assessment in accordance with Figures 1(e) and 1(f).
ActewAGL reserves the right to withhold gas supply to an installation
where the hazardous area assessment has not been performed.
b) In accordance with AS/NZS 60079.10.1, the building owner or
authorised representative must obtain a hazardous area dossier, for
the Type 2 enclosure. Prior to gas supply, ActewAGL must sight the
hazardous area dossier for the Type 2 enclosure. ActewAGL
reserves the right to withhold gas supply to an installation where the
hazardous area dossier cannot be sighted.
c) Figure 1(e) classifies the default hazardous area generated by a
meter set/regulator set installed in a Type 2 enclosure which is
naturally ventilated. The building owner or authorised representative
must obtain certification from a design engineer that the Type 2
enclosure has undergone a ventilation assessment in accordance
with AS/NZS 60079.10.1, deeming the Type 2 enclosure to have
adequate natural ventilation utilising Figure 1(e) classification.
Downgrading of Figure 1(e) classification to non-hazardous is
permitted as long as the ventilation assessment confirms the
downgrade is justifiable, and certification is provided. Certification shall
form part of the hazardous area dossier.
d) Figure 1(f) classifies the default hazardous area generated by a
typical meter set/regulator set installed in a Type 2 enclosure fitted
with mechanical ventilation. Classifications shown in Figure 1(f)
assume a medium degree of ventilation. The building owner or
authorised representative must obtain certification from a design
engineer to downgrade this classification. Certification shall be a
ventilation assessment in accordance with AS/NZS 60079.10.1. Any
certification, if undertaken, shall form part of the hazardous area
dossier.
(16) Ventilation by mechanical means must service the meter set/regulator set
Type 2 enclosure only and not ventilate any other area of the building.
(17) Fan motors shall be remote from the exhaust duct (indirect drive) or be
rated to operate in a Zone 1 hazardous area.
(18) Ventilation ducts from the Type 2 enclosure that pass through a wall
must be fitted with an appropriate fire damper.
(19) The meter set/regulator set may be installed in a plant room where the
plant room must meet the relevant Australian Standards and all Type 2
enclosures clauses in this section (3.4.2) of the GS&I Rules;
(20) Where required by BCA, the Type 2 enclosure will be fitted with a fire
sprinkler.
(21) Where required by BCA, the Type 2 enclosure will be fitted with a
smoke detector.
(22) The building owner or authorised representative shall be responsible for
the maintenance and upkeep of fire protection systems, gas detection
systems, hazardous area rated equipment, ventilation equipment and
integrity of any vent lines.
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ActewAGL Gas Service and Installation Rules
(23) The building owner or authorised representative shall maintain maintenance
records of the fire protection system, gas detection system, hazardous
area dossier, hazardous area rated equipment, ventilation equipment and
vent lines for review by ActewAGL at any time.
(24) The building owner or authorised representative shall be responsible for
ensuring no obstructions are placed on either side of the Type 2
enclosure door(s).
(25) The Type 2 enclosure door(s) must be fitted with a lock that an
ActewAGL gas distribution key can open.
ActewAGL GS&I Rules – REV D
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ActewAGL Gas Service and Installation Rules
Figure 1(a). Minimum clearances for meter set maintenance access
(Available from the ActewAGL website)
Available from ActewAGL website
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ActewAGL Gas Service and Installation Rules
Figure 1 (b). Clearances for domestic meter installations
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 1(c). Type 1 enclosure - Free Standing
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 1(d). Type 1 enclosure - Adjacent to Wall
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 1(e). Type 2 enclosure – Natural Ventilation
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 1(f). Type 2 enclosure – Mechanical Ventilation
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 1(g). Meter set installation design for a Type 1 enclosure or Type 2 enclosure
ActewAGL GS&I Rules – REV D
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
Figure 2. Examples of appropriate permanent safety barriers
Enclosures not shown
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ActewAGL Gas Service and Installation Rules
4 APPENDICES
4.1 Appendix A: Scope of Gas Work
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4.2 Appendix B - Domestic Gas Meter Location Reference Drawings
(Available from ActewAGL website)
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ActewAGL Gas Service and Installation Rules
4.3 Appendix D- Scope of AS/NZS 4645.1 in Natural Gas Supply
Chain
Reproduced from AS/NZS 4645.1: 2008
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ActewAGL Gas Service and Installation Rules
4.4 Appendix E – Signage
4.5.1 Type 1 Enclosures: Flammable Gas
Use for Figure 1(c) & Figure 1(d) Type 1 enclosures
300 x 200 mm
300 x 250 mm
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ActewAGL Gas Service and Installation Rules
4.6 Zone 2 Hazardous Area
4.6.1 Type 2 Enclosures: Natural Ventilation
Use for Figure 1(e) Type 2 enclosure
300 x 200 mm
300 x 250 mm
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ActewAGL Gas Service and Installation Rules
4.7
Zone 1 Hazardous Area
4.7.1 Type 2 Enclosures: Mechanical Ventilation
Use for Figure (f) Type 2 enclosure
300 x 200 mm
300 x 250 mm
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