255.455 External corrosion control: buried or submerged pipelines installed after July 31, 1971...

(a)Except as provided in subdivisions (b), (c), (f), and (g) of this section, each buried or submerged pipeline installed after July 31, 1971, must be protected against external corrosion.#

(1)It must have an external protective coating meeting the requirements of section 255.461 of this Part.#

(2)It must have a cathodic protection system designed to protect the pipeline in its entirety, installed and placed in operation within one year after completion of construction.#

(b)An operator need not comply with subdivision (a) of this section, if the operator can demonstrate by tests, investigation, or experience in the area of application, including, as a minimum, soil resistivity measurements and tests for corrosion accelerating bacteria, that a corrosive environment does not exist.#

(1)However, within six months after an installation made pursuant to the preceding sentence, the operator shall conduct tests, including pipe-to-soil potential measurements with respect to either a continuous reference electrode or an electrode using close spacing, not to exceed 20 feet (6.1 meters), and soil resistivity measurement at all potential profile peak locations, to adequately evaluate the potential profile along the entire pipeline.#

(2)If the tests made indicate that a corrosive condition exists, the pipeline must be cathodically protected in accordance with paragraph (a)(2) of this section.#

(c)An operator need not comply with subdivision (a) of this section, if the operator can demonstrate by tests, investigation or experience that:#

(1)for a copper pipeline, a corrosive environment does not exist; or#

(2)for a temporary pipeline with an operating period of service not to exceed five years beyond installation, corrosion during the five-year period of service of the pipeline will not be detrimental to public safety.#

(d)Notwithstanding the provisions of subdivision (b) or (c) of this section, if a pipeline is externally coated, it must be cathodically protected in accordance with paragraph (a)(2) of this section.#

(e)Aluminum may not be installed in a buried or submerged pipeline if that aluminum is exposed to an environment with a natural pH in excess of eight. For lower values of pH aluminum may not be installed unless tests or experience indicate its suitability in the particular environment involved.#

(f)This section does not apply to electrically isolated, metal alloy fittings in plastic pipelines, if;#

(1)for the size fitting to be used, an operator can show by tests, investigation, or experience in the area of application that adequate corrosion control is provided by alloyage; and#

(2)the fitting is designed to prevent leakage caused by localized corrosion pitting.#

(g)Electrically isolated metal alloy fittings installed after January 22, 2019, that do not meet the requirements of subdivision (f) of this section must be cathodically protected, and must be maintained in accordance with the operator's integrity management plan.#