External corrosion control: buried or submerged components.

(a)Each buried or submerged component that is subject to external corrosive attack must be protected from external corrosion by—#

(1)Material that has been designed and selected to resist the corrosive environment involved; or#

(2)The following means:#

(i)An external protective coating designed and installed to prevent corrosion attack and to meet the requirements of § 192.461 of this chapter; and#

(ii)A cathodic protection system designed to protect components in their entirety in accordance with the requirements of § 192.463 of this chapter and placed in operation before October 23, 1981, or within 1 year after the component is constructed or installed, whichever is later.#

(b)Where cathodic protection is applied, components that are electrically interconnected must be protected as a unit.#