The role of coatings in the development of corrosion and stress corrosion cracking on gas transmission pipelines.

摘要

In order to protect pipelines against corrosion and stress corrosion cracking NOVA Gas Transmission (NGT) has employed a dual system involving the application of an insulating coating and effective cathodic protection to all pipelines. Since the installation of pipelines in the 1950's the coatings of choice have changed with time. Construction in the 1950's and 1960's employed asphalt products which were hot applied over the ditch. Subsequently in the 1960's and 1970's polyethylene tape coatings were used extensively. Today the coatings of choice on the NGT system are fusion bond epoxies and extruded polyethylene systems.