AS/NZS 4158:2003 (R2015) pdf free.Thermal-bonded polymeric coatings on valves and fittings for water industry purposes.
1.1 SCOPE
This Standard specifies the requirements for factory-applied thermal-bonded polymeric corrosion protective coatings(barrier coatings)。 For the purposes of this Standard, the term polymeric coating is intended to encompass both thermoplastic and thermosetting coating materials. which are used to coat both the internal and external surfaces of valves and fittings.
This Standard covers the following service application areas:
(a) Factory-applied coatings and associated coatings used for repair.
(b )Ductile iron, grey cast iron, malleable iron, steel and copper alloy based substrates.
(c) Valves, fittings and their components and associated equipment
(d)Contact with water, and wastewater up to 50°C.
(e)Above and below ground exposure.
NOTES:
I Some coatings may not be suitable for all wastewaters. Compatibility should be checked with the manufacture
2 Guidelines on requirements to be specified by the purchaser are given in Appendix A.
Means of demonstrating compliance with this Standard are given in Appendix B.
1.2 REFERENCED DOCUMENTS
The documents referred to in this Standard are listed in Appendix C.
1.3 DEFINITIONS
For the purpose of this Standard, the definitions given in AS/NZS 3500.0 and those below apply.
1.3.1 Coating
A material, applied to a surface at a specified film thickness, that is intended to protect the surface from corrosive elements or conditions such as moisture, gases, and abrasion b windblown or waterborne particles.
1. 3.2 Coated product
A valve or fitting or part thereof that has a coating applied to it.
2.1 SCOPE OF SECTION
This Section specifies coating system type tests that have to be met prior to using the coating system on valves and fittings. It also includes coating specification and coating material supply requirements.
2.2 COATING SYSTEM SPECIFICATON
The coating system shall be specified in accordance with Appendix D.
2.3 TYPE TESTS
2.3.1 General
Coated test pieces, applied in accordance with the system specification(see Appendix D) shall meet the type test requirements specified in Clauses 2.3.1 to 2.3.10(summarized in Table 2. 1 ) These tests shall be undertaken on the coating system, in order to demonstrate the suitability of the coating for service. Hot water immersion and repair coating material testing shall be undertaken to qualify each nominated substrate material. The remainin tests shall be undertaken using either steel, cast iron or copper alloy as the substrate.
Type testing shall be performed on samples with an average coating thickness within 100 um of the specified minimum coating thickness.