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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.
Advancing technologies for pipeline construction techniques and increasingly severe operating parameters present challenges for pipeline coatings. Multi-layer coatings have evolved to increase the mechanical toughness of the system, to provide corrosion protection at elevated temperatures, to provide specific surface textures, to provide a foundation for insulation systems, and to accept the rigors of specific construction techniques. Qualification test methods must give assurance that the basic system has the ability to survive the operating conditions after construction. Quality control (QC) testing must provide assurance that acceptable performance is consistently achieved throughout the course of mill and field application activities. Proper selection of test methods and proper interpretation of test results are essential components of comprehensive pipe coating and construction projects. 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. These parameters determine long-term performance. A new interpretation of the simple water soak test can be a valuable tool in quality control testing. Keywords: fusion-bonded epoxy, polyethylene, polypropylene, centrifugal blast, disbondment, insulation
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.
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In this paper the approach of an Oil Company is demonstrated from the initial choice between different primers: inorganic zinc and organic (epoxy) zinc., to all the preliminary pre-qualification tests, the subsequently field test performed, and the procedures adopted, costs included.
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.