AS 3723-1989

1 - AS 3723-1989 INSTALLATION AND MAINTENANCE OF PLASTICS PIPE SYSTEMS FOR GAS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 REFERENCED DOCUMENTS.
6 - 1.3 DEFINITIONS.
6 - 1.3.1 Approved and approval
6 - 1.3.2 Authority, Operating
6 - 1.3.3 Authority, Statutory
6 - 1.3.4 Backfill
6 - 1.3.5 Bedding material
6 - 1.3.6 Electrofusion fittings
7 - 1.3.7 Gas
7 - 1.3.8 Hot tap
7 - 1.3.9 Insertion
7 - 1.3.10 Main
7 - 1.3.11 Pressure.
7 - 1.3.12 Purging
7 - 1.3.13 Service
7 - 1.4 MATERIALS.
7 - 1.4.1 Pipe and fittings.
7 - 1.4.2 Rubber rings.
7 - 1.4.3 Lubricants for rubber ring and expansion joints.
7 - 1.4.4 Adhesives and cleaning or priming fluids.
8 - SECTION 2. GENERAL REQUIREMENTS FOR THE SELECTION AND USE OF PLASTICS PIPES AND GAS
8 - 2.1 SCOPE OF SECTION.
8 - 2.2 HANDLING AND STORAGE.
8 - 2.2.1 General.
8 - 2.2.2 Handling.
8 - 2.2.3 Storage.
8 - 2.2.4 Coils.
8 - 2.2.5 Pipe stacking.
8 - 2.3 SAFETY
8 - 2.4 THERMALEXPANSION.
10 - SECTION 3. JOINTING METHODS
10 - 3.1 SCOPE OF SECTION.
10 - 3.2 POLYAMIDE PIPE AND FITTINGS.
10 - 3.2.1 General.
10 - 3.2.2 Adhesive joints.
10 - 3.2.3 Mechanical joints.
11 - 3.3 POLYETHYLENE PIPE AND FITTINGS.
11 - 3.3.1 Fusion joints.
11 - 3.3.2 Butt fusion.
11 - 3.3.3 Socket fusion.
12 - 3.3.4 Saddle fusion.
14 - 3.3.5 Electrofusion jointing of PE.
14 - 3.3.6 Mechanical joints.
15 - 3.4 UPVC PIPE AND FITTINGS.
15 - 3.4.1 General.
15 - 3.4.2 Solvent joints.
15 - 3.4.3 Mechanical joints.
17 - SECTION 4. STOPPING THE GAS FLOW
17 - 4.1 GENERAL METHODS.
17 - 4.2 BAGGING-OFF.
17 - 4.3 SQUEEZING-OFF.
17 - 4.3.1 General.
17 - 4.3.2 Preliminary assessment.
17 - 4.3.3 Return to service.
17 - 4.4 BENDING-BACK.
17 - 4.5 CAPPING.
17 - 4.6 SAFETY.
20 - SECTION 5. INSTALLATION OF PLASTICS PIPES FOR GAS
20 - 5.1 INSTALLATION OF GAS PIPING.
20 - 5.1.1 Excavation and bedding.
20 - 5.1.2 Boring and conduits
20 - 5.1.3 Ploughing-in.
20 - 5.1.4 Installing pipe.
21 - 5.1.5 Tie-ins.
21 - 5.1.6 Marker tape and tracer wire.
21 - 5.1.7 Insertion.
21 - 5.1.8 Purging.
22 - SECTION 6. TESTING AFTER INSTALLATION
22 - 6.1 GENERAL.
22 - 6.2 PRESSURE TESTING.
22 - 6.3 TEST PROGRAM.
22 - 6.4 PREPARATION OF THE TESTING EQUIPMENT.
22 - 6.5 PREPARATION OF THE TEST SECTION.
22 - 6.6 PRESSURIZATION.
22 - 6.7 TEST PROCEDURE.
23 - 6.8 ASSESSMENT OF THE TEST.
23 - 6.9 DISPOSAL OF TEST FLUID.
23 - 6.10 COMMISSIONING OF TEST SECTION.
24 - SECTION 7. MAINTENANCE OF PLASTICS PIPING
24 - 7.1 GENERAL.
24 - 7.2 MAINS.
24 - 7.3 SERVICES.

Provides installation and jointing procedures for below-ground plastics pressure systems in gas service. Precautions in the selection and handling of plastics pipes are given, and recommended procedures for isolation and maintenance of plastics pipes are covered.

This Standard sets out methods of installing polyamide, polyethylene and unplasticizedPVC (hereinafter referred to as PA, PE, UPVC respectively) gas pipelines below ground for pressure applications. Requirements for the selection, storage and handling of plastics pipe, and procedures for the jointing of plastics materials are specified. Alternative isolation procedures and piping maintenance methods are given.This Standard is primarily intended for use in association with pipe and fittings complying with AS 1464, Parts 1 and 2, AS 1667, Parts 1 and 2, AS 2718, Parts 1 and 2, and AS 2944, Parts 1 and 2.