AS/NZS 4645.3:2018
Gas distribution networks - Part 3: Plastics pipe systems
Provides for the protection of the general public, gas distribution network operating personnel and the environment, and to ensure safe and reliable operation of gas distribution networks that reticulate gas to consumers. This Standard covers plastics pipe systems within gas distribution networks in accordance with AS/NZS 4645.1 for operating pressures up to 1050 kPa. Committee AG-008 acknowledges that the gas industry will continue to seek to implement technical developments that enable safe, reliable and efficient gas distribution networks. This may include the use of plastics for applications beyond the pressure limits set out in this Standard.
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AS/NZS 4645.3:2018 GAS DISTRIBUTION NETWORKS - PLASTICS PIPE SYSTEMS
PREFACE
CONTENTS
FOREWORD
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 EXCLUSIONS
1.3 NORMATIVE REFERENCES
1.4 RECORDS
1.5 DEFINITIONS
1.6 ABBREVIATIONS
SECTION 2 MATERIALS AND COMPONENTS
2.1 NEW MATERIALS AND NEW COMPONENTS
2.2 MATERIALS AND COMPONENTS IDENTIFICATION
2.3 VALVES, FITTINGS AND ACCESSORIES
2.3.1 General
2.3.2 Flanges and flanged fittings
2.3.3 Gaskets and ring joints
2.3.4 Glues, solvent adhesives and cleaning or priming
2.3.5 Valves
SECTION 3 DESIGN
3.1 GENERAL
3.2 MAXIMUM ALLOWABLE OPERATING PRESSURE (MAOP)
3.3 POLYETHYLENE MAINS AND SERVICES
3.3.1 Design factor (C)
3.3.2 Minimum required strength (MRS)
3.3.3 Maximum allowable operating pressure (MAOP)
3.4 POLYVINYL CHLORIDE (PVC) MAINS AND SERVICES
3.5 POLYAMIDE (PA) MAINS AND SERVICES
3.6 BENDS
3.7 DESIGN FOR HIGH DENSITY COMMUNITY USE
3.8 WARNING MARKERS FOR MAINS AND SERVICES
3.9 OFFSET DISTANCES
3.10 DEPTH OF COVER
3.11 SEPARATION FROM OTHER UTILITY ASSETS
SECTION 4 JOINTING
4.1 SCOPE OF SECTION
4.2 POLYETHYLENE PIPE AND FITTINGS
4.2.1 General
4.2.2 Butt fusion
4.2.3 Electrofusion jointing of PE
4.2.4 Heated tool jointing of PE
4.3 POLYVINYL CHLORIDE (PVC) MAIN, SERVICE AND FITTINGS
4.4 POLYAMIDE MAIN, SERVICE AND FITTINGS
4.4.2 Non-destructive testing of solvent glued joints
4.4.3 Destructive testing of solvent glued joints
SECTION 5 CONSTRUCTION AND INSTALLATION
5.1 HANDLING AND STORAGE
5.1.1 General
5.1.2 Handling
5.1.3 Storage
5.1.4 Coils
5.2 PROTECTION
5.2.1 Covering ends
5.2.2 Cleaning internally
5.2.3 Surface condition of pipe for mains or services
5.3 BURIAL
5.3.1 Alignment
5.3.2 Stresses induced during laying
5.3.3 Width of trenches
5.3.4 Grading
5.3.5 Padding
5.3.6 Backfilling
5.3.7 Protection of main or service from shear loading
5.3.8 Reinstatement
5.4 TRENCHLESS INSTALLATION
5.4.1 General
5.4.2 Trenchless procedures
5.4.3 Insertion
5.5 THERMAL EXPANSION AND FLEXIBILITY
5.6 STATIC ELECTRICITY
5.7 POSITIONING OF PIPES AND VALVES
5.7.1 Valves
5.7.2 Pipe markings
5.8 INTERFERENCE WITH CATHODIC PROTECTION SYSTEMS
SECTION 6 PRESSURE TESTING
6.1 GENERAL
6.2 SAFETY
6.3 TESTING PROGRAM
6.4 STRENGTH TESTING
6.4.1 General
6.4.2 Minimum test pressure
6.4.3 Testing at operating pressure
6.4.4 Pneumatic strength testing
6.4.5 Acceptance criteria
6.5 LEAK TESTING
6.5.1 General
6.5.2 Duration
6.5.3 Acceptance criteria
6.5.4 Considerations for pneumatic tests
6.6 ASSESSMENT OF RESULTS FROM PRESSURE TEST
6.7 REPORTS AND RECORDS
SECTION 7 COMMISSIONING
7.1 GENERAL
7.2 PLANNING
7.3 PURGING (INTRODUCTION OF COMBUSTIBLE GAS)
7.4 POST COMMISSIONING TESTING
SECTION 8 MAINTENANCE
8.1 GENERAL
8.2 STOPPING THE GAS FLOW
8.2.1 General
8.2.2 Bagging-off
8.2.3 Squeezing-off
8.2.4 Plugging off
8.2.5 Bending back
APPENDIX A - TYPICAL JOINTING EQUIPMENT FOR POLETHYLENE
A1 BUTT WELDING
A2 HEATED TOOL SADDLE FUSION
A3 HEATED TOOL SOCKET FUSION
A4 ELECTROFUSION
APPENDIX B - PRESSURE TEST SAFETY
B1 GENERAL
B2 TEST EQUIPMENT
B2.1 General
B2.2 Pressure
B2.3 Temperature
B2.4 Cleaning and dewatering
B2.5 Valves and flanges
B2.6 Flexible hoses
B3 PHYSICAL PROTECTIVE MEASURES FOR PNEUMATIC TESTING
B4 PNEUMATIC TESTING EXCLUSION ZONES
B4.1 General
B4.2 Pneumatic testing exclusion zone dimensions
B5 DE-PRESSURIZATION
B5.1 Pneumatic test
B5.2 Hydraulic test
APPENDIX C - PRESSURE TEST METHODS
C1 GENERAL
C2 VOLUMETRIC DISPLACEMENT METHODS
C2.1 Metering method
C2.2 Bubble leak detector method
C3 PRESSURE LOSS METHODS
C3.1 Direct method
C3.2 Differential method
C4 PRESSURE TEST RECORD
APPENDIX D - DIRECT PURGING METHODS
D1 GENERAL
D2 DIRECT PURGING
D2.1 Overview
D2.2 Staged approach
D2.3 Gradual approach-Constant orifice pressure method
D2.4 Branch purging-Gradual approach-Constant pressure method
D3 ORIFICE SIZING CALCULATIONS
D3.1 General
D3.2 Calculation assumptions
D4 ALTERNATIVE METHOD-GRADUAL APPROACH-VARYING PRESSURE METHOD
APPENDIX E - SPECIALIZED TOOLING FOR PE PIPE INSTALLATIONS
APPENDIX F - ACCEPTABLE BEAD SIZES FOR BUTT FUSION
BIBLIOGRAPHY
Previous versions
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References
Solvent cements and priming fluids for PVC (PVC-U and PVC-M) and ABS and ASA pipes and fittings
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AS/NZS 4645.3:2018 GAS DISTRIBUTION NETWORKS - PLASTICS PIPE SYSTEMS
PREFACE
CONTENTS
FOREWORD
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 EXCLUSIONS
1.3 NORMATIVE REFERENCES
1.4 RECORDS
1.5 DEFINITIONS
1.6 ABBREVIATIONS
SECTION 2 MATERIALS AND COMPONENTS
2.1 NEW MATERIALS AND NEW COMPONENTS
2.2 MATERIALS AND COMPONENTS IDENTIFICATION
2.3 VALVES, FITTINGS AND ACCESSORIES
2.3.1 General
2.3.2 Flanges and flanged fittings
2.3.3 Gaskets and ring joints
2.3.4 Glues, solvent adhesives and cleaning or priming
2.3.5 Valves
SECTION 3 DESIGN
3.1 GENERAL
3.2 MAXIMUM ALLOWABLE OPERATING PRESSURE (MAOP)
3.3 POLYETHYLENE MAINS AND SERVICES
3.3.1 Design factor (C)
3.3.2 Minimum required strength (MRS)
3.3.3 Maximum allowable operating pressure (MAOP)
3.4 POLYVINYL CHLORIDE (PVC) MAINS AND SERVICES
3.5 POLYAMIDE (PA) MAINS AND SERVICES
3.6 BENDS
3.7 DESIGN FOR HIGH DENSITY COMMUNITY USE
3.8 WARNING MARKERS FOR MAINS AND SERVICES
3.9 OFFSET DISTANCES
3.10 DEPTH OF COVER
3.11 SEPARATION FROM OTHER UTILITY ASSETS
SECTION 4 JOINTING
4.1 SCOPE OF SECTION
4.2 POLYETHYLENE PIPE AND FITTINGS
4.2.1 General
4.2.2 Butt fusion
4.2.3 Electrofusion jointing of PE
4.2.4 Heated tool jointing of PE
4.3 POLYVINYL CHLORIDE (PVC) MAIN, SERVICE AND FITTINGS
4.4 POLYAMIDE MAIN, SERVICE AND FITTINGS
4.4.2 Non-destructive testing of solvent glued joints
4.4.3 Destructive testing of solvent glued joints
SECTION 5 CONSTRUCTION AND INSTALLATION
5.1 HANDLING AND STORAGE
5.1.1 General
5.1.2 Handling
5.1.3 Storage
5.1.4 Coils
5.2 PROTECTION
5.2.1 Covering ends
5.2.2 Cleaning internally
5.2.3 Surface condition of pipe for mains or services
5.3 BURIAL
5.3.1 Alignment
5.3.2 Stresses induced during laying
5.3.3 Width of trenches
5.3.4 Grading
5.3.5 Padding
5.3.6 Backfilling
5.3.7 Protection of main or service from shear loading
5.3.8 Reinstatement
5.4 TRENCHLESS INSTALLATION
5.4.1 General
5.4.2 Trenchless procedures
5.4.3 Insertion
5.5 THERMAL EXPANSION AND FLEXIBILITY
5.6 STATIC ELECTRICITY
5.7 POSITIONING OF PIPES AND VALVES
5.7.1 Valves
5.7.2 Pipe markings
5.8 INTERFERENCE WITH CATHODIC PROTECTION SYSTEMS
SECTION 6 PRESSURE TESTING
6.1 GENERAL
6.2 SAFETY
6.3 TESTING PROGRAM
6.4 STRENGTH TESTING
6.4.1 General
6.4.2 Minimum test pressure
6.4.3 Testing at operating pressure
6.4.4 Pneumatic strength testing
6.4.5 Acceptance criteria
6.5 LEAK TESTING
6.5.1 General
6.5.2 Duration
6.5.3 Acceptance criteria
6.5.4 Considerations for pneumatic tests
6.6 ASSESSMENT OF RESULTS FROM PRESSURE TEST
6.7 REPORTS AND RECORDS
SECTION 7 COMMISSIONING
7.1 GENERAL
7.2 PLANNING
7.3 PURGING (INTRODUCTION OF COMBUSTIBLE GAS)
7.4 POST COMMISSIONING TESTING
SECTION 8 MAINTENANCE
8.1 GENERAL
8.2 STOPPING THE GAS FLOW
8.2.1 General
8.2.2 Bagging-off
8.2.3 Squeezing-off
8.2.4 Plugging off
8.2.5 Bending back
APPENDIX A - TYPICAL JOINTING EQUIPMENT FOR POLETHYLENE
A1 BUTT WELDING
A2 HEATED TOOL SADDLE FUSION
A3 HEATED TOOL SOCKET FUSION
A4 ELECTROFUSION
APPENDIX B - PRESSURE TEST SAFETY
B1 GENERAL
B2 TEST EQUIPMENT
B2.1 General
B2.2 Pressure
B2.3 Temperature
B2.4 Cleaning and dewatering
B2.5 Valves and flanges
B2.6 Flexible hoses
B3 PHYSICAL PROTECTIVE MEASURES FOR PNEUMATIC TESTING
B4 PNEUMATIC TESTING EXCLUSION ZONES
B4.1 General
B4.2 Pneumatic testing exclusion zone dimensions
B5 DE-PRESSURIZATION
B5.1 Pneumatic test
B5.2 Hydraulic test
APPENDIX C - PRESSURE TEST METHODS
C1 GENERAL
C2 VOLUMETRIC DISPLACEMENT METHODS
C2.1 Metering method
C2.2 Bubble leak detector method
C3 PRESSURE LOSS METHODS
C3.1 Direct method
C3.2 Differential method
C4 PRESSURE TEST RECORD
APPENDIX D - DIRECT PURGING METHODS
D1 GENERAL
D2 DIRECT PURGING
D2.1 Overview
D2.2 Staged approach
D2.3 Gradual approach-Constant orifice pressure method
D2.4 Branch purging-Gradual approach-Constant pressure method
D3 ORIFICE SIZING CALCULATIONS
D3.1 General
D3.2 Calculation assumptions
D4 ALTERNATIVE METHOD-GRADUAL APPROACH-VARYING PRESSURE METHOD
APPENDIX E - SPECIALIZED TOOLING FOR PE PIPE INSTALLATIONS
APPENDIX F - ACCEPTABLE BEAD SIZES FOR BUTT FUSION
BIBLIOGRAPHY
Previous versions
AS/NZS 4645.3:2018
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.