Evaluation of FBE Coatings for High Temperature Pipeline Applications

摘要

In oilfields from Colombia, the surface operating temperatures of pipelines are around 120°C. Actually, Canadian and ASTM standard tests set the conditions for Cathodic Disbonding Testing to maximum temperature of 95 °C, while our scope for coating evaluation is between 95 to 150 °C. To select for higher performance coatings systems, we have developed a testing protocol to be applied at the factory, in the laboratory and in the field to assess the performance of coatings for operating conditions between 95 to 150°C. The protocol involved the following tests: dry film thickness, porosity, mechanical, abrasion resistance test, impact and elongation, adhesion, wet adhesion, immersion in chemical solution, cathodic disbonding and electrochemical impedance. The results in the laboratory can be correlated between the glass transition temperature and the electrochemical response. To clarify damage level found in the coatings evaluated. As a result of this work was found a reliable methodology for evaluating coatings at temperatures above 95°C. A good correlation was found in the results of electrochemical impedance tests and cathodic disbondment evaluated to 150°C.