New developments in joint coating and field repair technology

摘要

This article describes the development of new joint coating and field repair systems on gas and oil transmission lines. Historically, the major problems associated with field-applied coatings were directly related to the sensitivity to prevailingenvironmental conditions, such as substrate cleanliness and preparation, and application technique. In lab and field trials, a new generation of heat shrinkable systems has been proven to perform as well as the mainline coating. The emphasis in these newdevelopments, in addi9tion to the "in service" performance, has been the search for systems that stress ease of application and tolerance to environmental conditions.