AS 1518-1979

1 - AS 1518-1979 EXTRUDED HIGH-DENSITY POLYETHYLENE PROTECTIVE COATING FOR PIPES
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND DEFINITIONS
6 - 1.1 SCOPE.
6 - 1.2 DEFINITIONS.
6 - 1.2.1 Coating
6 - 1.2.2 Sealant
6 - 1.2.3 Weather exposure
6 - 1.2.4 Surface preparation
6 - SECTION 2. MATERIALS AND QUALIFYING PROPERTIES
6 - 2.1 GENERAL.
6 - 2.2 SEALANT.
6 - 2.2.1 General.
6 - 2.2.2 Softening Point.
6 - 2.2.3 Plasticity.
6 - 2.2.4 Coarse Particle Contaminants.
6 - 2.3 POLYETHYLENE EXTRUSION COMPOUND.
6 - 2.3.1 Composition.
6 - 2.3.2 Dispersion of Ingredients.
6 - 2.3.3 Melt Flow Index.
6 - 2.3.4 Density.
6 - 2.3.5 Environmental Stress-Cracking.
7 - SECTION 3. SURFACE PREPARATION AND APPLICATION OF COATING SYSTEM
7 - 3.1 PREPARATION OF PIPE SURFACE.
7 - 3.2 APPLICATION OF SEALANT.
7 - 3.3 APPLICATION OF POLYETHYLENE EXTRUSION COMPOUND
7 - 3.4 THICKNESS OF EXTRUDED POLYETHYLENE COMPOUND
7 - 3.5 DOUBLE COATING.
7 - 3.6 DETECTION AND REPAIR OF FLAWS.
7 - 3.6.1 Electric Flaw Detection Test.
7 - 3.6.2 Repairs.
7 - 3.7 CLEANING OF PIPE ENDS.
8 - SECTION 4. REQUIREMENTS OF COATING SYSTEM
8 - 4.1 GENERAL.
8 - 4.2 MELT FLOW INDEX.
8 - 4.3 TENSILE YIELD STRENGTH AND ELONGATION.
8 - 4.3.1 Single Specimen Test.
8 - 4.3.2 Confirmatory Tests.
8 - 4.4 COARSE PARTICLE CONTAMINANTS.
8 - 4.5 ELECTRIC FLAW DETECTION.
8 - 4. 6 CATHODIC DISBONDING.
8 - 4.7 WEATHERABILITY.
8 - 4.7.1 General.
8 - 4.7.2 Weatherability Test.
9 - SECTION 5. FREQUENCY OF TESTING
9 - 5.1 FREQUENCY.
10 - SECTION 6. STORAGE, HANDLING AND TRANSPORT
10 - 6.1 EXPOSURE PERIOD.
10 - 6.2 HANDLING AND STORAGE OF COATED PIPES.
10 - 6.3 TRANSPORT OF COATED PIPES.
10 - SECTION 7. MARKING
10 - 7.1 MARKING.
11 - APPENDIX A - GUIDELINES FOR THE PURCHASE OF COATED PIPES
11 - A1 GENERAL.
11 - A2 STORAGE PERIOD.
11 - A3 INFORMATION TO BE SUPPLIED BY THE PURCHASER.
11 - A4 SELECTION AND PREPARATION OF TEST SPECIMENS.
11 - A5 TEST CERTIFICATE.
11 - A5.1 General.
12 - A5.2 Certificate of Compliance (Materials).
12 - A5.3 Certificate of Compliance (Coating System).
13 - APPENDIX B - SEALANT TESTS
13 - B1 SCOPE.
13 - B2 BEND TEST PROCEDURE.
13 - B2.1 Specimen Preparation.
13 - B2.2 Temperature Conditioning.
13 - B2.3 Bending Procedure.
13 - B2.4 Bend Test Acceptance Level.
13 - B3 COARSE PARTICLES CONTAMINANTS TEST.
13 - B3.1 Apparatus.
13 - B3.2 Test Specimen.
13 - B3.3 Procedure.
13 - B3.4 Acceptance Level.
14 - APPENDIX C - ELECTRIC FLAW DETECTION TEST
14 - C1 SCOPE.
14 - C2 APPARATUS.
14 - C3 TECHNICAl REQUIREMENTS.
14 - C4 OPERATING VOLTAGE ADJUSTMENT.
14 - C5 METHOD OF TESTING.

Applies to a coating in which a sealant is interposed between the pipe and the polyethylene extrudate. It is intended for use where not subject to weather exposure, although provision is made for six months' exposure during storage prior to installation. Pipeline operating temperature limits are -40 degrees Celsius to +60 degrees Celsius.

This standard specifies the requirements and test methods for extruded high-density polyethylene coating of pipes for protection against corrosion, whereby a sealant is interposed between the pipe and the polyethylene extrudate. The coating is intended for use in applications where it is not subject to weather exposure, although a safe period of not greater than 6 months of weather exposure is allowed for to cover the storage period prior toinstallation. Polyethylene materials complying with this standard are intended for application to pipes where the pipeline operating temperatures are not normally more than + 60C nor less than - 40C.NOTE: Guide lines to purchasers of coated pipes on requirements that must be specified by t he purchaser and those that must or may be agreed upon at the time of enquiry or order are given in Appendix A.

Under Revision see DR 00185 CP