March 2011, Vol. 238 No. 3


Long-term Durability Of Clock Spring Repairs - Recent Removals And Examinations

The Clock Spring repair system was the subject of a rigorous research and development program conducted under the management of the Gas Research Institute (GRI, now known as GTI). The program extended over a decade and considered long-term degradation. Special sections of the program specifically investigated the cathodic disbondment and cathodic shielding effects, as these were considered to be potentially deleterious to the integrity of the repair and, by extension, to pipeline safety. An extensive field validation program was required by the U.S. Department of Transportation. This requirement was added to verify the laboratory experimental results and to provide real-world

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