External corrosion of line pipe -- A summary of research activities
- Novacor Research and Technology Corp., Calgary, Alberta (Canada)
- Nova Gas Transmission Ltd., Calgary, Alberta (Canada)
External corrosion and cracking are major threats for buried pipelines in sparsely settled, geologically benign areas. External corrosion is the main deterioration mechanism that can reduce the structural integrity of buried gas transmission pipelines on the Nova Gas Transmission pipeline system. To protect against externally induced corrosion and cracking, this pipeline system uses a number of different coating materials including asphalts, polyolefin tapes, and fusion-bonded epoxies. Line pipe is further protected by an impressed current cathodic protection (CP) system with a minimum specified potential of {minus}950 mV (Cu/CuSO{sub 4}). Unfortunately, corrosion problems still can occur on the system under certain conditions. The company has been involved in pipeline integrity research focused on the kinetics and mechanisms of the corrosion and cracking phenomena that threaten gas transmission systems. This article reviews some key findings of that work regarding coating failure, CP under failed coatings, corrosion scenarios, and environmentally induced cracking.
- OSTI ID:
- 205544
- Journal Information:
- Materials Performance, Journal Name: Materials Performance Journal Issue: 3 Vol. 35; ISSN MTPFBI; ISSN 0094-1492
- Country of Publication:
- United States
- Language:
- English
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