THE EVOLUTION OF COATINGS

摘要

Jim Banach, Consultant to SPC, Canada, illustrates the evolution of girth weld coatings over time, from tapes and coal tar wraps to urethane and liquid epoxy. In the early 1980s. 100% solids urethane was first used in North America to coat pipeline girth welds. Urethane supplanted fusion bonded epoxy (FBE) used for coating girth welds where the mainline was coated with FBE. Liquid urethane had the advantage of lower cost and improved performance. At that time, newly constructed pipelines were mainly coated with FBE. The use of tapes and coal tar wraps declined sharply for mainline and girth weld coating.