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AS/NZS 5601.1:2010

[Available Superseded]

Gas installations, Part 1: General installations

Specifies requirements and means of compliance for the design, installation and commissioning of gas installations that are associated with use or intended use of fuel gases such as natural gas, LP Gas, biogas or manufactured gas.
Published: 23/12/2010
Inclusive of GST
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope and application
1.2 Exclusions
1.3 Compliance
1.4 Occupational health and safety
1.5 Interpretation
1.6 Definitions
2 Performance based design and other essential requirements
2.1 General
2.2 General work and safety requirements
2.2.1 Verification of gas supply
2.2.2 Work on a gas installation
2.2.3 Sealing of open ends
2.2.4 Testing of consumer piping
2.2.5 Testing of gas installations
2.2.6 Safe practices and OHS
2.2.7 Increasing pressure of gas installations
2.2.8 Commissioning and recommissioning
2.2.9 Decommissioning
2.3 Materials, fittings and components
2.3.1 Materials
2.3.2 Proprietary systems
2.3.3 Jointing
2.4 Consumer piping
2.4.1 General
2.4.2 Design
2.4.3 Prevention of reverse flow
2.4.4 Location
2.4.5 Support of consumer piping
2.4.6 Corrosion control
2.4.7 Provision for clearing condensate
2.4.8 Gas pressure regulators
2.4.9 Over-pressure protection
2.4.10 Pressure test points
2.4.11 Gas venting
2.4.12 Gas pressure raising devices
2.5 Flues
2.5.1 General
2.5.2 Design
2.5.3 Materials
2.5.4 Installation
2.5.5 Location
2.5.6 Dampers
2.5.7 Flue terminals
2.5.8 Common flues
2.5.9 Power flues
2.5.10 Use of existing flues or chimneys
2.6 Installing gas appliances
2.6.1 Pre-installation
2.6.2 General installation requirements
2.6.3 Gas appliance location
2.6.4 Limitations on installation of an appliance
2.6.5 Ventilation of the gas appliance space and air supply to gas appliances
2.6.6 Valve trains
2.6.7 Gas appliance connection
2.6.8 Commissioning
3 Means of compliance — General requirements and safe work practices
3.1 Gas supply
3.2 Gas demand
3.3 Safe work practices
3.3.1 General
3.3.2 Isolating gas supply
3.3.3 Purging after completion of work
3.4 Sealing of open pipe ends
3.4.1 Removal of debris
3.4.2 Open ends to be sealed while work is in progress
3.4.3 Outlet provided for future connection to be sealed
3.5 Testing of piping
3.5.1 Testing a new gas installation
3.5.2 Testing consumer piping after alteration, repair or extension
3.6 Acceptable substances for testing
3.7 Hot-tapping of branch fitting to consumer piping
3.8 Increasing the operating pressure of existing consumer piping
3.9 Dealing with dangerous gas installations
3.10 Methods of locating gas leaks
3.11 Safety requirements in the vicinity of gas leaks or suspected gas leaks
3.12 Safe discharge of static electricity
3.13 Electrical safety bonding or bridging
3.14 Clearing a blockage in consumer piping
4 Materials, fittings and components
4.1 General
4.1.1 Suitability for use
4.1.2 Reuse of materials and components
4.1.3 Mating parts
4.2 Materials for consumer piping
4.3 Consumer piping restrictions
4.4 Prohibited types of joints and fittings
4.5 Proprietary systems
4.5.1 Suitability for intended use
4.5.2 Installation of proprietary systems
4.5.3 Substitution of components
4.5.4 Identification of proprietary piping systems
4.6 Material between LP Gas cylinder valve and inlet to first regulator
4.7 Other materials
4.7.1 Fire resistant material
4.7.2 Gasket material
4.7.3 Jointing compounds and materials
4.7.4 Vent line material
4.7.5 Flue material
4.8 Components
4.8.1 Miscellaneous components
4.8.2 Manual shut-off valves
4.8.3 Hose assemblies
4.8.4 Swivel joints and couplings
5 Installing consumer piping
5.1 General
5.1.1 Condition of pipe and pipe fittings
5.1.2 Prohibition of earthing through consumer piping
5.1.3 Protection from other materials
5.1.4 Storage and handling of pipe
5.1.5 Condition of pipe during installation
5.1.6 Restriction on repair of defective pipe or pipe fitting
5.1.7 Jointing
5.1.8 Restriction on use of thread sealant
5.1.9 Bending pipe
5.1.10 Re-making a flanged joint
5.1.11 Pipe installation not to reduce building strength or fire resistance
5.1.12 Identification of pipework
5.2 Design of consumer piping
5.2.1 Pressure rating of piping and components
5.2.2 Appliance pressure rating
5.2.3 Requirements where pressurized air, oxygen or a stand by gas is to be used in conjunction with the fuel gas
5.2.4 Consumer piping size
5.2.5 Pipe size for consumer piping supplying a domestic type gas appliance
5.2.6 Flexibility of piping
5.2.7 Pipe alignment at expansion joint
5.2.8 Means of disconnection
5.2.9 Occupancy isolation
5.2.10 Building isolation
5.2.11 Isolation for specific installations
5.2.12 Provision of emergency valve (Steam boilers and hot water boilers)
5.2.13 Proprietary multilayer piping
5.3 Location of consumer piping
5.3.1 Prohibited locations
5.3.2 Piping in an air duct, plenum ceiling, air handling plenum or ventilating duct
5.3.3 Piping not to be subject to physical damage
5.3.4 Separation from above-ground electrical equipment
5.3.5 Piping not to support an electrical conductor
5.3.6 Piping not to be exposed to liquid discharge
5.3.7 Above-ground piping not to touch the ground
5.3.8 Piping in a concealed location other than underground or embedded in concrete
5.3.9 Piping passing through a building’s exterior wall
5.3.10 Piping passing through walls and floors
5.3.11 Piping beneath a building and in the ground
5.3.12 Ventilation of concealed piping
5.3.13 Piping embedded in concrete
5.3.14 Piping in wooden joists
5.3.15 Piping in wooden plates and studs
5.3.16 Piping in steel framed buildings
5.3.17 Protection of multilayer piping
5.4 Installation of consumer piping underground
5.4.1 General
5.4.2 Bedding and support of pipe in the ground
5.4.3 Depth of cover
5.4.4 Quality of bedding and backfill
5.4.5 Consolidation of bedding and backfill material
5.4.6 Marker tape
5.4.7 Termination of plastic pipe and metallic continuation
5.4.8 Securing a riser
5.4.9 Separation from underground electrical cable
5.4.10 Separation from underground electrical earthing electrode
5.4.11 Separation from underground communication cable
5.4.12 Separation from underground services
5.4.13 Crossing other underground services
5.5 Corrosion control
5.5.1 Corrosion protection of bare steel
5.5.2 Corrosion protection of above-ground pipework
5.5.3 Joining of electrochemically incompatible materials
5.5.4 Requirement where coated steel pipe emerges from the ground
5.5.5 Requirement where consumer piping is to include cathodic protection
5.5.6 Proving effectiveness of pipe protection
5.6 Water and dust clearing provision in consumer piping
5.6.1 Provision of tailpipe
5.6.2 Design and location of a tailpipe
5.6.3 Marking of tailpipes
5.6.4 Tailpipes that terminate below ground level
5.6.5 Provision for dust clearing
5.7 Consumer piping for a high-rise building
5.7.1 General
5.7.2 Prohibition on flexible hoses
5.7.3 Plan of consumer piping to be displayed on site
5.7.4 Manual shut-off valve in riser and lateral
5.7.5 Support and flexibility of riser
5.7.6 Minimizing strain at a lateral
5.8 Support of consumer piping
5.8.1 Consumer piping support system requirements
5.8.2 Spacing of supporting devices
5.8.3 Diameter of rod hangers
5.9 Use of hose assemblies
5.9.1 Hose assembly requirements
5.9.2 Prohibited location of hose assembly connection point
5.9.3 Location of connection point for hose assembly
5.9.4 Hose assembly—Prohibited installation methods
5.9.5 Hose assembly—Operating conditions
5.9.6 Hose assembly connecting an appliance
5.9.7 Hose assembly connecting a portable or mobile appliance
5.10 Quick-connect devices
5.10.1 Quick-connect device installed outside above ground
5.10.2 Quick-connect device socket installation method where subjected to water or dust
5.10.3 Quick-connect devices installed outdoors below ground
5.11 Installing gas equipment
5.11.1 Consumer piping gas pressure regulators Requirements for a consumer piping gas pressure regulator Consumer piping gas pressure regulator installation requirements Prohibited locations for a consumer piping regulator Where a consumer piping gas pressure regulator is required Where a gas appliance regulator is not required Consumer piping regulator outlet operating pressure notice
5.11.2 Over-pressure protection Over-pressure protection and its performance Requirements where over-pressure protection system shuts off the gas supply
5.11.3 Protection of gas supply system from low pressure where a gas pressure-raising device or a gas engine is installed
5.11.4 Pressure test points
5.11.5 Venting Performance of vent line Vent line terminating outside a building Limitation on interconnection of vent lines Size of a common vent line Size of vent line for a consumer piping gas pressure regulator breather vent or relief device Size of vent line for a vented safety shut-off system Discharge from breather vents Restriction of breather vent Vent terminal location Vent terminal construction Vent line to be readily removable
5.11.6 Sub-meters Requirements for sub-meters Prohibited locations of a sub-meter Sub-meter location and identification Sub-meter in a recess or meter box in a cavity wall Ventilation requirements where in an enclosure Provision of manual shut-off valve Connection of the sub-meter
5.12 Gas pressure-raising devices
5.12.1 Protection against pulsation
5.12.2 Connection requirements
5.12.3 Required controls
5.12.4 Requirements of downstream pipe and equipment
5.13 Ventilation of gas equipment
5.13.1 General
5.13.2 Natural ventilation to outside Enclosures containing meters or regulators Enclosures containing pressure-raising devices
5.13.3 Natural ventilation via adjacent room
5.13.4 Mechanical ventilation
5.13.5 Location of openings
5.13.6 Ventilation of an enclosure containing a meter or regulator and a gas pressure-raising device
5.13.7 Ventilation of an enclosure containing gas equipment and a gas appliance
6 Installing gas appliances
6.1 Requirements for gas appliances
6.1.1 New Zealand requirements
6.1.2 Australian requirements
6.1.3 Appliance conversion
6.2 General installation requirements
6.2.1 Determination of adequate gas supply
6.2.2 Manufacturer’s installation instructions
6.2.3 Restriction on flueless gas appliances
6.2.4 Restriction on appliance location
6.2.5 Temperature limitation on nearby combustible surface
6.2.6 Gas appliances using pressurized air or oxygen or having a standby gas connected
6.2.7 Automatic control to fail safe
6.2.8 Electrical requirements
6.2.9 Restoration of electricity supply
6.2.10 Gas appliance support
6.2.11 Earthquake restraint
6.2.12 Flexible connections for the prevention of vibration
6.2.13 Connection of gas appliance designed to move on castors, rollers or wheels
6.2.14 Gas appliance restraint where a hose assembly is used
6.2.15 Push-on connectors limited to connecting laboratory bunsen burners
6.3 Gas appliance location
6.3.1 Adverse effect of air movement systems
6.3.2 Protection from physical damage
6.3.3 Accessibility
6.3.4 Hazards to buildings or persons
6.3.5 Proximity of flammable goods or chemicals
6.3.6 Presence of water
6.3.7 Installation above a source of cooking vapour, steam or grease
6.3.8 Installation in a cupboard
6.3.9 Installation in a bedroom
6.3.10 Installation in a garage
6.3.11 Appliance in a roof space
6.3.12 Location of appliances in residential premises
6.3.13 Appliance on roof, wall or elevated structure in locations other than single residential premises
6.3.14 Appliance under a floor
6.3.15 Domestic gas barbeques and radiant gas heaters
6.4 Air supply to gas appliances
6.4.1 Adequacy of air supply
6.4.2 Quality of air supply
6.4.3 Installation where atmosphere is contaminated
6.4.4 Air requirements for gas appliances General Natural ventilation Natural ventilation via adjacent room Location of ventilation openings Mechanical ventilation Interlock for mechanical air supply to gas appliance Air heating gas appliance in a confined space Combustion and dilution air for a gas appliance with an open flue Appliance in a residential garage Special requirements for flueless gas appliances
6.5 Gas shut-off when automatic fire equipment operates
6.5.1 Interlock of automatic fire-extinguishing equipment with gas supply
6.5.2 Interlock of automatic fire damper and gas supply
6.5.3 Gas shut-off controls interfaced with fire alarm systems
6.6 Gas appliance connection
6.6.1 Restriction on appliance connection
6.6.2 Pipe connection
6.6.3 Means of isolation
6.6.4 Means of disconnection
6.7 Flue design
6.7.1 Provision of a flue
6.7.2 Effect on building strength or fire resistance
6.7.3 Material
6.7.4 Design requirements
6.7.5 Flue gases not to cause a nuisance
6.7.6 Common or combined flues
6.7.7 Draught diverters
6.7.8 Power flues
6.7.9 Flue cowls
6.7.10 Condensate drains
6.7.11 Use of existing flue or chimney
6.8 Flue installation
6.8.1 Provision for removal of gas appliance
6.8.2 Support independent of gas appliance
6.8.3 Soft-soldered flue joints
6.8.4 Flue joints
6.8.5 Weatherproofing through a roof or wall
6.8.6 Brick and masonry flues
6.8.7 Clearance around a draught diverter
6.8.8 Prohibited locations for flues
6.8.9 Concealed metal flues
6.8.10 Application of twin wall flues
6.8.11 Clearance between a single wall flue and a combustible surface
6.8.12 Protection of combustible surfaces
6.8.13 Protection of adjacent non-combustible materials from heat of flue
6.8.14 Clearance from wiring and other services
6.9 Flue terminals
6.9.1 Terminating an open flue—Location
6.9.2 Terminating a flue above a roof
6.9.3 Location of flue terminal of balanced flue appliance, room-sealed appliance, fan-assisted appliance or outdoor appliance
6.9.4 Termination of a flue under a covered area or in a recess
6.9.5 Terminating a flue in a roof space
6.10 Additional requirements for installation of specific gas appliances
6.10.1 Domestic gas cooking appliances Clearance around a gas cooking appliance Protection of a combustible surface near a gas cooking appliance Multiple cooker installations in domestic science classrooms Clearance above a high level griller Clearance from oven flue of elevated gas cooking appliance Connecting an elevated cooking appliance Indoor open grid barbecues in residential premises Installation of LP Gas cooktops Connecting a freestanding cooking appliance using a hose assembly—High level connection Under cooker connection Stabilization of a freestanding cooking appliance Inbuilt oven Single boiling burners
6.10.2 Commercial catering equipment Combination cooking ranges Clearances to a grease filter Clearances around commercial catering equipment Commercial catering equipment on a combustible surface
6.10.3 Instantaneous water heaters Prohibited locations Flueless instantaneous water heater
6.10.4 Storage water heaters
6.10.5 Pool heaters (including those for swimming, spa and therapeutic pools) Prohibited locations Supporting base Control systems Requirement for pool heater where flow and return water pipes are of plastic Non-return valve required Restriction on fitting of a valve in water flow line
6.10.6 Space heaters Limitation on installation Open flued appliance with rear register Restrictions on installation of flueless space heater Installation of space heater in an institution
6.10.7 Overhead radiant heaters Overhead radiant heaters installed indoors Overhead radiant heaters installed outdoors or in quasi-outdoor situations
6.10.8 Patio heaters Limitation on installation Pole mounted Suspended other than by pole mounting
6.10.9 Decorative flame effect fires (not flame effect gas space heaters) Prohibited installation Requirements for fireplace and chimney Damper not permitted in chimney or flue Flue cowl requirements Ventilation requirements
6.10.10 Ducted air heaters Location Interaction of heating air and air for combustion Ductwork not to prevent lighting or servicing
6.10.11 Air curtains
6.10.12 Direct fired air heaters Prohibited locations Restriction on air supply
6.10.13 Overhead radiant tube heaters Requirements for installation Requirements for an installation where atmosphere is contaminated Clearances required around the heater
6.10.14 Laundry dryers Laundry dryer with exhaust fan Exhaust duct required Exhaust duct requirements Ventilation requirements Exhausting into a room or enclosure Dryers for community use—Operating instructions to be displayed
6.10.15 Gas lights
6.10.16 Incinerators Required clearances to combustible surfaces Flueing of an incinerator Operating instructions to be displayed
6.10.17 Pottery kiln Support to be non-combustible and of adequate strength Flame safeguard system required Clearances between a hood or canopy and combustible material Flueing of a pottery kiln Flue dampers
6.10.18 Refrigerator Prohibited locations Required clearances Requirements where refrigerator is to be in a sealed recess. Requirement for annealed copper tube connection
6.11 Commissioning requirements
6.11.1 Australian requirements
6.11.2 New Zealand requirements
6.11.3 Commissioning of appliance
6.11.4 Commissioning requirements
Appendix A
Appendix B
Appendix C
C1 Introduction
C2 Specification for fire resistant material
C3 Examples to determine required thickness of fire resistant material
C4 Acceptable methods of protection
Appendix D
D1 Introduction
D2 Precautions before purging commences
D3 Purging a sub-meter
D4 Purging a small volume installation with gas to remove air
D4.1 Pipe length in a small volume installation
D4.2 Commencing the purge
D4.3 Purging through an appliance fitted with an open burner
D4.4 Purging through an appliance fitted with a flame safeguard device
D4.4.1 General
D4.4.2 Electronic flame safeguard device fitted
D4.4.3 Thermoelectric device fitted
D5 Purging a large volume gas installation
D6 Purging consumer piping to remove gas
Appendix E
E1 Introduction
E2 Limitation of tests
E3 Leakage testing of installations
E3.1 New installations
E3.2 Additions and alterations to installations
E4 Pipework test procedure
E5 Installation test procedure
E6 Leakage test for existing installations
E7 Testing a connection made after a test procedure
E8 Additional tests for LP Gas systems
E8.1 Testing LP Gas piping upstream of first stage regulator
E9 Additional tests for systems with a pressure relief device
E10 Selecting the test instrument
Appendix F
F1 Introduction
F1.1 General
F1.2 Pipe conditions
F1.3 Fitting allowance
F1.4 Equations used
F1.5 Excessive gas velocity
F2 Information required
F3 Design procedure using pipe sizing graphs
F3.1 Introduction
F3.2 Worked example
F3.2.1 Introduction
F3.2.2 Sketch the layout
F3.2.3 Tabulate the pipe runs
F3.2.4 Determine the length of the longest pipe run
F3.2.5 Determine the allowable pressure drop per metre
F3.2.6 Determine the required pipe size for the pipe sizing graphs
F4 Pipe sizing graphs
F5 Design procedure using pipe sizing tables
F5.1 Introduction
F5.2 Worked example
F5.2.1 Introduction
F5.2.2 Sketch the piping layout
F5.2.3 Determine the main run
F5.2.4 Select the piping material
F5.2.5 Select the pipe sizing table
F5.2.6 Tabulate the pipe runs
F5.2.7 Selecting the pipe size
F6 Pipe sizing tables
Appendix G
G1 Introduction
G2 Using the nomograms
G3 Example using a nomogram
Appendix H
H1 Flue design for appliances with atmospheric burners
H1.1 Introduction
H1.2 Factors influencing flue design
H1.2.1 Heat loss
H1.2.2 Resistance to flow of flue gases
H1.3 Designing individual appliance flues
H1.3.1 Design procedure
H1.3.2 Example of flue design for individual appliance flue
H1.4 Common flues (combined and multiple flues)
H1.4.1 Design principles
H1.4.2 Performance of common flue
H1.4.3 Flue connector—Change of direction
H1.4.4 Resistance to flow of flue gases—Manifolds and laterals
H1.4.5 Design of common flue—Appliances at different levels
H1.4.5.1 Design factors
H1.4.5.2 Example of flue design for appliances at different levels
H1.4.5.3 Alternative method using oversize common flue
H1.4.6 Design of common flue—Appliances at same level
H1.4.6.1 Total flue height
H1.4.6.2 Example of flue design for appliances at same level
H2 Power flue design
H2.1 Power flue applications
H2.2 Design requirements
H2.2.1 Air supply
H2.2.1.1 General
H2.2.1.2 Provision for plant room air
H2.2.1.3 Flue design requirements
H2.2.2 Requirement for a damper
H2.2.3 Sizing of the fan
H2.2.4 Fan requirements
H2.2.5 Fan failure sensing devices
H2.2.6 Noise and vibration reduction requirements
H2.2.7 Commissioning the power flue
Appendix I
I1 Diagramatic representation of outdoor areas
I2 Domestic gas barbecues and radiant gas heaters
Appendix J
J1 General
J2 Cylinder requirements
J3 Location of cylinders
J3.1 General
J3.2 Prohibited locations
J3.3 Cylinders on a verandah
J3.4 Cylinders in an enclosure or recess
J3.5 Cylinders under buildings
J3.6 Cylinders in public locations
J4 Installation
J4.1 Installing cylinders
J4.2 Cylinder connection
J5 Clearances around cylinders
J6 Cylinder regulators
J7 LP Gas cylinder capacity
J8 Vaporization capacity for cylinders and tanks
Appendix K
K1 Introduction
K2 Gas supply
K3 Consumer piping
K4 Pipe riser shafts
K5 Consumer pipe location
K6 Components to be accessible
K7 Pipe support systems
K7.1 Components to be considered
K7.2 Pipe anchor
K7.3 Pipe riser clamp
K7.4 Pipe guides
K7.5 Spring clip
K8 Expansion and contraction of consumer piping and buildings
K8.1 Thermal expansion
K8.1.1 Selecting a design temperature differential
K8.1.2 Calculating the thermal expansion
K8.2 Building shrinkage
K8.3 Design for expansion/contraction
K9 Branches (off takes)
K10 Valves
K10.1 Pipe riser isolation valves
K10.2 Off take isolation valves
K10.3 Apartment isolation valves
K11 Plan of pipe
K12 Boosters
Appendix L
1.0 Explanation
2.0 Housing
2.0.2 Detached Dwellings
2.0.3 Multi-unit Dwelling
2.0.4 Group Dwelling
3.0 Communal residential
3.0.2 Community Service
3.0.4 Community Care
4.0 Communal non-residential
4.0.2 Assembly Service
4.0.3 Assembly Care
5.0 Commercial
6.0 Industrial
7.0 Outbuildings
8.0 Ancillary
Appendix M
M1 For New Zealand
M1.1 General
M1.2 Exclusion areas and hazardous zones
M1.2.1 General
M1.2.2 Electrical equipment
M1.2.3 Natural gas
M1.2.4 LP Gas
M2 For Australia
M2.1 Meter location
M2.2 Multiple meters
M2.3 Subsequent work
Appendix N
N1 Introduction
N2 Technical Regulators
N3 Details of special local requirements
N3.1 Quick-connect devices
N3.2 Restriction on installation of a flueless space heater
N3.3 Restriction on installation of an instantaneous hot water unit within a roof space
N3.4 Replacement of flueless space heaters
Amendment control sheet
Cited references in this standard
Malleable cast iron threaded pipe fittings
NZS 3501
Specification for copper tubes for water, gas and sanitation
Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels, Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels, Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa) (ISO 6993-1:2006, MOD)
Pipe threads where pressure-tight joints are made on the threads, Part 1: Dimensions, tolerances and designation
Content history
[Available Superseded]
[Available Superseded]
NZS 5261:2003
DR 08157