Adhesion and Delamination Mechanisms of Multilayer Organic Field Joint Coatings on Carbon Steel
01.09.2012 - 01.09.2015
Carbon steel pipelines to transport hydrocarbons installed in the sea need to be coated for corrosion protection on the one hand and for insulation to maintain the temperature of the pipe contents on the other hand. At first, this polymer coating is factory applied to the whole length of the pipe, but afterwards cut back (ca. 40 cm) at the ends of each section (12 m) to allow the offshore welding of two sections together. After welding, a field joint coating (FJC) is applied in situ to re-establish the polymer coating to the pipeline. The specific nature of this offshore FJC application makes it difficult to ensure optimal application conditions for the FJC and simultaneously to meet all requirements.