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Title: Pipeline Casings-Electrical Characteristic Interpretations
Author: Robert A. Moody
Source: American Gas Association 1986
Year Published: 1986
Abstract: A 1979, A.G.A. Pipeline Research Committee project concluded that it is possible for a carrier pipe 10 be cathodically protected within a shorted casing if an annular electrolyte is present and if the metallic contact resistance (if any) is greater than approximately 5 ohms. The conclusion was reached because of the ability to meet or exceed presently established caihodic protection criteria by taking pipe-toelectrolyte measurements through ports built into the casing wall. Combinations of electrolyte resistivity, metallic contact resistance values, carrier coaling condition, and casing coating condition were studied. The predominant factors influencing cathodic protection were found to be the value of the metallic resistance rather than product temperature, the coating conditions of the carrier pipe or casing, end seal integrity, electrolyte resistance or physical parameters, such as casing length, diameter, etc.

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