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Title: Suggested Criteria For Cathodic Protection In Gas Distribution Systems
Author: John H. Fitzgerald
Source: American Gas Association 1973
Year Published: 1973
Abstract: The U.S. Department of Transportation Minimum Federal Standards for Transportation of Natural and Other Ga.s by Pipeline (Part 192-Title 49-Dockct No. OPS-5). commonly called Ihe DOT Code, lists several criteria for cathodic protection. In essence. these are: Steel, cast or ductile iron structures- 1. 0.85 volt to copper-copper sulfate half cell, 2. Negative voltage shift of at least 300 millivolts, 3. Minimum negative polarization shift of 100 millivolts. 4. A voltage at least as negative as that originally established at the beginning of Ihe Tafel segment of the E Log 1 Curve. 5. A net protective current as measured bv an earth current meter.

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