General

This standard presents recommended practices for the cathodic protection (CP) of internal surfaces of oil-treating vessels, heat exchangers, or the water side of process vessels.

The provisions of this standard should be applied under the direction of a corrosion engineer. The term "corrosion engineer," as used in this standard, refers to a person who, by reason of knowledge of the physical sciences and the principles of engineering and mathematics, acquired by professional education and related practical experience, is qualified to engage in the practice of corrosion control in oil-treating vessels.

Effective performance of the CP system requires operation within the limits of the design, monitoring of the system, and maintenance to replace damaged and consumed parts.

CP is not effective when applied to steel surfaces in the oil or gas phase because of the absence of an electrolyte. Coatings or chemical inhibitors should be used to control corrosion on the steel surfaces in the oil and gas phase.

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