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High temperature FBE coating disbondment in Mlulti-Layer PP insulation coatings

机译：高温FBE涂层拆制在散膜PP绝缘涂层中

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Multi-layer polypropylene (MLPP) insulation coating has been widely used for thermal insulation of subsea pipelines. Where these MLPP systems have used well proven and correctly applied fusion bonded epoxy (FBE), they have generally functioned as intended. However, in recent years with wellhead temperatures 110°C and above, high temperature (HT) FBEs have been used. The performance of these newly formulated HT-FBEs in terms of maintaining adequate adhesion during long term storage and resistance to FBE disbondment before installation is not well understood. The international codes provide some guidance with regards to qualification testing requirements for the FBE layer and the overall MLPP system but do not provide sufficient detail to assure that the FBE anti-corrosion layer will retain its integrity for a prolonged storage period. This paper describes the author's field and laboratory/ full scale testing experience with the MLPP systems over the last 20 years. It offers some insight into the MLPP insulation system and its design, FBE material selection, FBE and MLPP pre-qualification testing protocol and recommended measures to minimise the potential for FBE disbondment during coated pipe storage.
机译：多层聚丙烯（MLPP）绝缘涂层已广泛用于海底管道的隔热。如果这些MLPP系统使用得很好并正确施加融合粘合环氧树脂（FBE），它们通常按预期运作。然而，近年来在井口温度110°C及更高的情况下，已经使用了高温（HT）FBE。这些新配制的HT-FBES的性能在长期储存期间保持足够的粘附性和在安装之前对FBE抵消进行了抗性而不是很好地理解。国际代码对FBE层和整体MLPP系统的资格测试要求提供了一些指导，但不提供足够的细节以确保FBE防腐层将保持其长期储存期的完整性。本文介绍了过去20年来与MLPP系统的现场和实验室/全面规模测试经验。它对MLPP绝缘系统及其设计，FBE材料选择，FBE和MLPP预验证测试协议提供了一些洞察力，并推荐措施，以最大限度地减少涂层管道储存期间FBE不配合的可能性。

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