NZS 5261:2003
Gas installation
Legislative changes in 1992 removed the responsibility for inspection and certification of gas installations from the gas suppliers and instituted a regime of gas certification by a person authorized under the Plumbers, Gasfitters and Drainlayers Act. This Standard in Part 1 details the various aspects of a gas installation that contribute to its safety, stating performance criteria that shall be achieved to ensure that the legislative requirements for safety of gas installations are met. Part 2 gives the gasfitter more detailed information as a means of compliance with these performance criteria for small installations, and Part 3 gives references for use in the design and specification of larger installations. The means of compliance in Parts 2 and 3 are not the only means of compliance with the performance criteria in Part 1. Gas installations should be undertaken by persons authorized under the Plumber Gasfitters and Drainlayers Act 1976.
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
COPYRIGHT
AMENDMENTS
CONTENTS
RELATED DOCUMENTS
New Zealand Legislation
LATEST REVISIONS
FOREWORD
REVIEW OF STANDARDS
PART 1 PERFORMANCE BASED DESIGN AND INSTALLATION CRITERIA
1.1 Scope and general information
1.2 General work and safety requirements
1.3 Materials and fittings
1.4 Gas pipework
1.5 Flues
1.6 Installing gas appliances
PART 2 INSTALLATION OF APPLIANCES AND EQUIPMENT GENERALLY BELOW 250 MJ/H RATED INPUT
2.1 Scope and general
2.2 General work and safety requirements
2.3 Materials and components
2.4 Installing consumer piping
2.5 Installing gas equipment
2.6 Installing gas appliances
2.7 Installation of specific gas appliances
2.8 Installation commissioning
PART 3 INSTALLATION OF GAS APPLIANCES AND EQUIPMENT GENERALLY ABOVE 250 MJ/H RATED INPUT AND ONE-OFF DESIGNS
3.1 Scope and general
3.2 Reference list of Standards
APPENDIX
A CONVERSION FACTORS
B SAFE WORKING PRACTICES
C PURGING
D PRESSURE TESTING A GAS INSTALLATION
E PIPE SIZING
F FLUE DESIGN
G LPG CYLINDER LOCATIONS
H GUIDELINES FOR GAS APPLIANCE COMMISSIONING
I LARGE INSTALLATION COMMISSIONING
J GAS APPLIANCE MAINTENANCE
K LARGE INSTALLATION MAINTENANCE
L SYMBOLS USED IN GAS CONTROL SYSTEM DIAGRAMS
M FIRE RESISTANT MATERIAL
N TYPICAL CLEARANCE DISTANCES FOR A SMALL GMS
O GAS INSTALLATION CHECKLIST (FOR INSTALLATIONS BELOW 250 MJ/h RATED OUTPUT)
STANDARDS COUNCIL APPROVAL
Table
1 – Wobbe Index
2 – Piping materials
3 – Flue materials
4 – Minimum thickness of mild steel for flues
5 – Miscellaneous components
6 – Domestic type gas appliance – minimum inlet pressure
7 – Piping in a concealed location
8 – Ventilation for concealed piping
9 – Spacing of supporting devices
10 – Depth of cover for consumer piping
11 – Vent pipe size for vented safety shut-off systems
12 – Ventilation of gas equipment – mechanical ventilation
13 – Ventilation
14 – Appliance isolation requirements
15 – Required clearance between a single wall metal or fibre cement flue and a combustible surface
16 – Minimum clearances required for flue terminals shown in figure 3
16(a) – Minimum clearances required for flue terminals from gas measurement systems shown in figure 3
16(b) – Protection of combustible materials used as cooker splashbacks
17 – Cooking surface area minimum clearances
18 – Clearances to grease filters
19 – Minimum clearances for cooking surface area
20 – Clearance to combustible material above overhead radiant heaters
21 – Minimum access for ventilation of refrigerators
22 – General work and safety requirements
23 – Materials and fittings
24 – Gas pipework
25 – Flues
26 – Installing appliances
A1 – Conversion factors
C1 – Approximate pipe length (m) for a volume of 0.03 m3
C2 – Pipe length above which an inert gas purge is required
D1 – Approximate pipe length for a volume of 0.03 m3
D2 – Acceptable pressure drops in existing installations
D3 – Test instruments
E1 – Gas properties
E2 – Information required
E3 – Installation details
E4 – Installation details
F1 – Flue sizes
F2 – Chimney sizes
K1 – Large installation maintenance
Figure
1 – Vent terminal exclusion zone
2 – Methods of protecting a combustible surface
3 – Minimum clearances for balanced flue terminals, etc.
4 – Required clearances around domestic gas cooking appliances
E1 – Example of consumer piping layout
E2 – Example of pipe sizing for natural gas in copper pipe
E3 – Pipe sizing for natural gas in steel pipe
E4 – Pipe sizing for natural gas in copper pipe
E5 – Pipe sizing for natural gas in polyethylene pipe
E6 – Pipe sizing for LPG (propane) in steel pipe
E7 – Pipe sizing for LPG (propane) in copper pipe
F1 – Flue design chart
G1 – Cylinder under a building
G2 – Minimum clearance to ignition sources
G3 – Minimum clearance to a drain or openings into a building
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References
Code of practice for gas distribution
Installation and use of LPG for non-propulsive purposes in caravans and boats
Related Information
Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 2(2A)
Citation context:'NZS 5261' means the New Zealand Standard known as NZS 5261:2003 (Gas installation)
Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 12(1)
Citation context:Every person who installs a gas installation or a part of a gas installation must install that gas installation or part in accordance with Part 1 of NZS 5261.
Building Code Compliance Document SH
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS1
Citation context:Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 12(3)
Citation context:Every person is deemed to have complied with subclause (1), in relation to an installation to which this subclause applies, if the person has complied with Part 2 of NZS 5261.
Approved Code Of Practice For The Design, Safe Operation, Maintenance And Servicing Of Boilers, 2000 Edition Incorporating Amendment 1:2004
Ministry: WorkSafe New Zealand
Section: 1.10.4
Citation context:Approved Code Of Practice For The Design, Safe Operation, Maintenance And Servicing Of Boilers, 2000 Edition Incorporating Amendment 1:2004
Ministry: WorkSafe New Zealand
Section: Appendix A1
Citation context:NZS 5261 Gas Installation.
Building Code Compliance Document SH
Ministry: Ministry of Business, Innovation, and Employment - Building Systems Performance (BSP)
Section: AS1
Citation context:Refers to 5261:2003(NZS)A1.
Gas Regulations 1993 (Revoked)
Ministry: Ministry of Economic Development
Section: 12(5)
Citation context:Every person is deemed to have complied with subclause (1), in relation to the application of a particular performance requirement of Part 1 of NZS 5261 to an installation to which this subclause applies, if--- that particular performance requirement is f
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
COPYRIGHT
AMENDMENTS
CONTENTS
RELATED DOCUMENTS
New Zealand Legislation
LATEST REVISIONS
FOREWORD
REVIEW OF STANDARDS
PART 1 PERFORMANCE BASED DESIGN AND INSTALLATION CRITERIA
1.1 Scope and general information
1.2 General work and safety requirements
1.3 Materials and fittings
1.4 Gas pipework
1.5 Flues
1.6 Installing gas appliances
PART 2 INSTALLATION OF APPLIANCES AND EQUIPMENT GENERALLY BELOW 250 MJ/H RATED INPUT
2.1 Scope and general
2.2 General work and safety requirements
2.3 Materials and components
2.4 Installing consumer piping
2.5 Installing gas equipment
2.6 Installing gas appliances
2.7 Installation of specific gas appliances
2.8 Installation commissioning
PART 3 INSTALLATION OF GAS APPLIANCES AND EQUIPMENT GENERALLY ABOVE 250 MJ/H RATED INPUT AND ONE-OFF DESIGNS
3.1 Scope and general
3.2 Reference list of Standards
APPENDIX
A CONVERSION FACTORS
B SAFE WORKING PRACTICES
C PURGING
D PRESSURE TESTING A GAS INSTALLATION
E PIPE SIZING
F FLUE DESIGN
G LPG CYLINDER LOCATIONS
H GUIDELINES FOR GAS APPLIANCE COMMISSIONING
I LARGE INSTALLATION COMMISSIONING
J GAS APPLIANCE MAINTENANCE
K LARGE INSTALLATION MAINTENANCE
L SYMBOLS USED IN GAS CONTROL SYSTEM DIAGRAMS
M FIRE RESISTANT MATERIAL
N TYPICAL CLEARANCE DISTANCES FOR A SMALL GMS
O GAS INSTALLATION CHECKLIST (FOR INSTALLATIONS BELOW 250 MJ/h RATED OUTPUT)
STANDARDS COUNCIL APPROVAL
Table
1 – Wobbe Index
2 – Piping materials
3 – Flue materials
4 – Minimum thickness of mild steel for flues
5 – Miscellaneous components
6 – Domestic type gas appliance – minimum inlet pressure
7 – Piping in a concealed location
8 – Ventilation for concealed piping
9 – Spacing of supporting devices
10 – Depth of cover for consumer piping
11 – Vent pipe size for vented safety shut-off systems
12 – Ventilation of gas equipment – mechanical ventilation
13 – Ventilation
14 – Appliance isolation requirements
15 – Required clearance between a single wall metal or fibre cement flue and a combustible surface
16 – Minimum clearances required for flue terminals shown in figure 3
16(a) – Minimum clearances required for flue terminals from gas measurement systems shown in figure 3
16(b) – Protection of combustible materials used as cooker splashbacks
17 – Cooking surface area minimum clearances
18 – Clearances to grease filters
19 – Minimum clearances for cooking surface area
20 – Clearance to combustible material above overhead radiant heaters
21 – Minimum access for ventilation of refrigerators
22 – General work and safety requirements
23 – Materials and fittings
24 – Gas pipework
25 – Flues
26 – Installing appliances
A1 – Conversion factors
C1 – Approximate pipe length (m) for a volume of 0.03 m3
C2 – Pipe length above which an inert gas purge is required
D1 – Approximate pipe length for a volume of 0.03 m3
D2 – Acceptable pressure drops in existing installations
D3 – Test instruments
E1 – Gas properties
E2 – Information required
E3 – Installation details
E4 – Installation details
F1 – Flue sizes
F2 – Chimney sizes
K1 – Large installation maintenance
Figure
1 – Vent terminal exclusion zone
2 – Methods of protecting a combustible surface
3 – Minimum clearances for balanced flue terminals, etc.
4 – Required clearances around domestic gas cooking appliances
E1 – Example of consumer piping layout
E2 – Example of pipe sizing for natural gas in copper pipe
E3 – Pipe sizing for natural gas in steel pipe
E4 – Pipe sizing for natural gas in copper pipe
E5 – Pipe sizing for natural gas in polyethylene pipe
E6 – Pipe sizing for LPG (propane) in steel pipe
E7 – Pipe sizing for LPG (propane) in copper pipe
F1 – Flue design chart
G1 – Cylinder under a building
G2 – Minimum clearance to ignition sources
G3 – Minimum clearance to a drain or openings into a building
Previous versions
NZS 5261:2003
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.