The following is a discussion of test results and application techniques for high temperature pipe line coatings of polypropylene over fusion bonded epoxy. Recent tests to internal temperatures of 150°C (300°F) indicate these coatings, when applied properly, will perform well at these temperatures. Test results from several different tests are included.
Repairs, field joints and bend coating with these type coatings are discussed. Problems during and after application are summarized. Use of well written specifications and experienced, dedicated inspectors add to the quality of the coating process. As industry moves to hotter and hotter production, these factors become even more critical in the pipeline coating process.