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Title: Pipeline River Crossings Inspection
Author: P. Paul Guy
Source: American Gas Association 1999
Year Published: 1999
Abstract: Construction and operation of river crossing pipelines is tremendously expensive. The consequences of a corrosion failure can cost even more than construction. For these reasons, cathodic protection and coatings have become a universally applied technique for mitigating corrosion on marine pipelines. For the corrosion protection system to be effective, a properly planned program of monitoring, inspection and maintenance is essential. The most widely accepted method of evaluating corrosion protection on pipelines is using potential measurements. Potential measurements on river pipelines have traditionally been recorded only at readily accessible locations such as risers, and test stations located near shore. Monitoring of pipeline corrosion protection only at shore installations provide limited information. It is possible that serious corrosion can be occurring along pipeline even when potentials at a riser or test station satisfy the criteria for cathodic protection. Divers can be used to take potential measurements and inspect the coatings on unburied pipelines, but this procedure is expensive and relies on the divers visually locating the pipeline. In some bays and rivers, using a diver is not practical.

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