MIL-HDBK-1004/10
APPENDIX E (continued)
(2) It must have a cathodic protection system designed to
protect the pipeline in its entirety in accordance with this subpart,
installed and placed in operation within one year after completion of
construction.
(b) An operator need not comply with paragraph (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. However, within 6 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, and soil
resistivity measurments at potential profile peak locations, to adequately
evaluate the potential profile along the entire pipeline. 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 paragraph (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 5 years beyond installation, corrosion during the 5-year
period of service of the pipeline will not be detrimental to public safety.
(d) Notwithstanding the provisions of paragraph (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
8, 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, and operator can show by
tests, investigation, or experience in the area of application that adequate
corrosion control provided by alloyage; and
(2) The fitting is designed to prevent leakage caused by localized
corrosion pitting.
[Amdt. 192-4, 36 FR 12302, June 30, 1971, as amended at Amdt. 192-28, 42 FR
35654, July 11, 1977; Amdt. 192-39, 47 FR 9844, Mar. 8, 1982]
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