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This paper describes the relevant characteristics of available joint coating types and examines different testing protocols to explore these characteristics. The objective is to assist in the selection of appropriate, practical, cost effective girth weld protective coatings. that will provide good long-term corrosion protection.
This paper describes the relevant characteristics of available joint coating types and examines different testing protocols to explore these characteristics. The objective is to assist in the selection of appropriate, practical, cost effective girth weld protective coatings that will provide good long-term corrosion protection. Application procedures and performance characteristics are the two main components that play vital roles in the selection of the coating system and both components must be tested. Appropriate testing programs for each coating type can vary and this is illustrated through examples. Using examples it is shown that laboratory testing can examine not only differences related to the coating type but also differences related to the degree of steel surface preparation.
Keywords: pipeline coatings, coating testing, coating selection, girth weld, coating application.
This paper begins with a brief discussion of essential properties of all pipeline coatings, and a listing of multi-layer systems designed to meet specific needs. It then focuses on special considerations regarding application parameters for multi-layer systems that use fusionbonded epoxy as the primer.
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Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
Two large scale problems with three layer polyolefin (3LPO) coatings are discussed here and possible reasons for the failures. Lessons learned and recommendations for future usage of such coatings are provided.