255.463 External corrosion control: cathodic protection.

(a)Each cathodic protection system required by this Part must provide a level of cathodic protection that complies with one or more of the applicable criteria contained in Appendix 14-D of this Title. If none of these criteria are applicable, the cathodic protection system must provide a level of cathodic protection at least equal to that provided by compliance with one or more of these criteria.#

(b)If amphoteric metals are included in a buried or submerged pipeline containing a metal of different anodic potential:#

(1)the amphoteric metals must be electrically isolated from the remainder of the pipeline and be cathodically protected; or#

(2)the entire buried or submerged pipeline must be cathodically protected at a cathodic potential that meets the requirements of Appendix 14-D of this Title for amphoteric metals.#

(c)The amount of cathodic protection must be controlled so as not to damage the protective coating or the pipe.#