AS 3862 pdf download.External fusion-bonded epoxy coating for steel pipes
This Standard specifies requirements and methods of test for external fusion-bonded epoxy (FBE) coating of steel pipes for protection against corrosion. This Standard covers both single-layer and multi-layer coating systems. NOTE 1 Guidelines to purchasers on information that should be supplied by the purchaser and those variables that should or may be agreed upon at the time of inquiry or order are given in Appendix A. NOTE 2 Line pipe manufactured in accordance with API 5LW may not be suitable for application of FBE coating without requiring additional surface preparation. Surface imperfections in the form of steel slivers, burrs and laminations can cause excessive holidays, resulting in the need for extra surface cleaning, grinding or filing. NOTE 3 Line pipe manufactured in accordance with API 5LW may require a more stringent straightness specification to allow coating in accordance with this Standard. NOTE 4 Consideration should be given to strain ageing when specifying line-pipe for FBE coating. Guidance is given in Clause 3.1.3. Methods for demonstrating conformance with this Standard are given in Appendix B.
1.3 Terms and definitions
For the purpose of this document, the definitions below apply. 1.3.1 abrasion resistant overcoat ARO two-layer FBE with an anti-corrosion coating and an abrasion-resistant overcoat 1.3.2 anti-slip overcoat rough textured outer surface FBE layer applied over a corrosion resistant FBE layer for a variety of service applications, such as a corrosion resistant underlayer for concrete coated pipe, offshore laying, or other handling applications requiring a higher friction coefficient 1.3.3 batch (FBE powder) quantity of epoxy powder produced using the same formulation and raw materials of the same source during a continuous production run of not more than 24 hours 1.3.4 bolster support for coated pipes during transport and storage 1.3.5 coating defect deleterious imperfection in the coating including disbonded areas, areas of low film thickness and holidays Note 1 to entry: Surface anomalies commonly referred to as “blowholes”, “fish-eyes”, “volcanoes” or “craters” are deleterious to the performance of the FBE coating only if they provide a pathway for water through the coating or significantly reduce the coating thickness. These anomalies should not be considered coating defects if they pass the holiday test and are constrained to the top layer of a multi-layer system. Solid lumps/drops, typically from gun tips, are not considered deleterious. 1.3.6 coupon sample of steel pipe coated with fusion bonded epoxy and used for laboratory tests 1.3.7 drop non-homogeneous or partially cured lump of powder deposited on the surface of the coating 1.3.8 holiday discontinuity of protective coating that exposes the steel to the outside environment 1.3.9 multi-layer FBE system consisting of a base layer of anti-corrosion FBE with an additional layer or layers of specifically formulated FBE Note 1 to entry: The additional layers are selected to provide additional specific properties to the coating system e.g. improved mechanical protection, resistance to UV and chalking, improved hot-wet resistance and anti-slip (generally for offshore pipe-laying or concrete application). 1.3.10 pinhole small discontinuity on the surface of the FBE coating which may or may not extend to the steel surface 1.3.11 pipe diameter length length of pipe equating to the diameter of the pipe 1.3.12 run sag visible flow of the coating under gravity to produce a significant local variation in film thickness 1.3.13 rust blooming visual detectable colour change on the surface of the pipe due to oxidation, other than as a result of pre-treatment 1.3.14 shelf life characteristic of each material formulation, which is related to storage time, temperature and humidity, which may make it unsuitable for use 1.3.15 substrate steel pipe surface to which the coating is to be applied 1.3.16 surface crater localized surface depression produced during coating application, detectable by normal vision 1.3.17 test panel sample of steel plate coated with fusion-bonded epoxy for laboratory tests