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Analytical methods for verification of assumed performance metrics, in terms of sizing are presented in this paper. The application of methods and criteria described in API 1163 for rejection and acceptance of assumed tool tolerance are discussed.
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External corrosion in uninsulated pipelines is normally able to be prevented by cathodic protection (CP). Generally, external corrosion on buried pipelines cannot occur if CP current is getting onto the pipe. CP is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode (pipe) in the same cell. For instance, to make a pipeline a cathode, an anode is attached to it.
On July 8th, 1986, an 8-inch pipeline transporting gasoline ruptured in Mounds View, Minnesota. Vaporized gasoline combined with air and liquid gasoline flowed along neighborhood streets. Approximately 30 minutes later, a vehicle entered the area igniting the gasoline vapor.
This paper discusses the revision of SSPC-PA 9, “Measurement of Dry Coating Thickness Using Ultrasonic Gages.” This standard describes procedures to measure the thickness of dry, homogeneous coatings applied to concrete, wood, wallboard, plastic, fiber and composite material using commercially available ultrasonic coating thickness gages.