Standard
Track updates
AS/NZS 4645.3:2018
[Current]Specifies materials, design, construction, installation, testing and maintenance requirements for below ground plastics gas distribution networks to be used in conjunction with AS/NZS 4645.1, for the distribution of fuel gas suitable for domestic, commercial or industrial uses.
Published: 28/02/2018
Pages: 61
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope and general
1.1 Scope
1.2 Exclusions
1.3 Normative references
1.4 Records
1.5 Definitions
1.6 Abbreviations
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
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
4 Jointing
4.1 Scope of section
4.2 Polyethylene pipe and fittings
4.2.1 General
4.2.2 Butt fusion
4.2.2.1 General
4.2.2.2 Non-destructive testing of butt fusion joints
4.2.2.3 Destructive testing of butt fusion joints
4.2.3 Electrofusion jointing of PE
4.2.3.1 General
4.2.3.2 Non-destructive testing of electrofusion joints
4.2.3.3 Destructive testing of electrofusion joints
4.2.4 Heated tool jointing of PE
4.2.4.1 General
4.2.4.2 Heated tool saddle fusion
4.2.4.3 Heated tool socket fusion
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
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
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
7 Commissioning
7.1 General
7.2 Planning
7.3 Purging (introduction of combustible gas)
7.4 Post commissioning testing
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
A1 Butt welding
A2 Heated tool saddle fusion
A3 Heated tool socket fusion
A4 Electrofusion
Appendix B
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
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
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
Appendix F
Bibliography
Cited references in this standard
[Current]
High-strength steel fastener assemblies for structural engineering - Bolts, nuts and washers, Part 1: Technical requirements
[Current]
ISO metric hexagon nuts, Part 4: Chamfered thin nuts — Product grades A and B
Content history
[Superseded]
[Superseded]
[Superseded]
DR AS/NZS 4645.3:2017
One-time Purchase
Access via web browser on any device
One-time purchase
Single publication
Offline access via PDF^
$242.18 AUD
Inclusive of GSTFormat *
Web Reader
Licenses *
1 License (for yourself - not shareable)
Total$242.18 AUD
IMPORTANT