Stockpiled FBE-coated line pipe can be subject to UV degradation

Studies undertaken for the 3,700-km Alliance Pipeline to quantify the effects of sunlight on fusion-bonded epoxy (FBE) coating on stockpiled line pipe indicated that the coating under full sunlight exposure showed a reduction in thickness and flexibility and a loss of gloss with chalking as a result of degradation by ultra-violet (UV) radiation.There were no significant differences, however, in cathodic disbondment, adhesion, and impact properties in the samples. Sections of production pipe stockpiled in Alberta and North Dakota for the project were selected for testing. The program was to evaluate the coating properties at periodic exposure intervals of nearly 2 years. The coating was t...

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