After construction of large pipeline networks in the past 50 years, rehabilitation of these pipelines now becomes a major topic. Materials to be refurbished are bituminous and coaltar coatings, PVC and PE- two-ply tapes. Collapse of these systems are both material properties and intrinsic system-built up drawbacks as well as application faults. This paper introduces some state of the art tape systems and polyurethane coatings which guarantee powerful and economical solutions for a variety of project requirements and includes a rehabilitation job site experience and long-term investigations of a major European operator. It pays off to choose the appropriate system for the unique project requirements of every rehabilitation site. It has to be taken into consideration that the percentage of each coating system is around 0,03 % - 1 % of the total project costs only, but due to low quality materials, not suited for the requirements on site or incorrect application, field joint coatings are a major source of defects which originates indirect losses and high consequential damages. Every chain is only as strong as its weakest part. Therefore it is negligent to disdain the value for a coating protection. For nearly all requirements on site there are high-quality long-lasting solutions available worldwide, one only have to choose the appropriate system. For standard temperatures up to +50 deg C state-of-the art three-ply tapes systems offer the widest range to meet the diverse and many conditions on sites and can be applied at ambient temperatures from -35 deg C to +60 deg C. At exceeded temperature ranges or requested raised mechanical resistance, thermosetting compounds based on polyurethane or epoxy will probably be the best choice.
Rehabilitation of corrosion protective coatings on buried steel pipelines
Sanierung von Korrosionsschutzüberzügen an unterirdischen Stahlrohrleitungen
2009
15 Seiten, 20 Bilder, 6 Tabellen, 19 Quellen
Conference paper
English
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