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Title: Road Casing Electrical Contact Characterization
Author: Virgil L. Johnston
Source: American Gas Association 1983
Year Published: 1983
Abstract: This discussion explores the reason that corrosion on pipe installed within a road casing may be less severe than that on the pipe adjacent to the crossing. Terms relating to the status of road casing insulation are explained and discussed. The methods available to determine the electrical status of casing insulation, including their advantages and disadvantages, are presented. The most universally accepted method of corrosion control for the external surface of a buried steel pipeline is to coat the pipe with a dielectric material. Supplementary Cathodic Protection (CP) is then added to protect the exposed steel at coating imperfections (holidays).

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