APPENDIX E (continued)
(f) Any pipe that is found to be generally corroded so that the
remaining wall thickness is less than the minimum thickness required by the
pipe specification tolerances must either be replaced with coated pipe that
meets the requirements of the part or, if the area is small, must be repaired.
However, the operator need not replace generally corroded pipe if the
operating pressure is reduced to be commensurate with the limits on operating
pressure specified in this subpart, based on the actual remaining wall
(g) If localized corrosion pitting is found to exist to a degree where
leakage might result, the pipe must be replaced or repaired, or the operating
pressure must be reduced commensurate with the strength of the pipe based on
the actual remaining wall thickness in the pits.
(h) Each operator shall clean, coat with material suitable for the pre-
vention of atmospheric corrosion, and, maintain this protection for, each
component in its pipeline system that is exposed to the atmosphere.
[Amdt. 195-22, 46 FR 38360, July 27, 1981, as amended by Amdt, 195-24, 47 FR
46852, Oct. 21, 1982; Amdt. 195-31, 49 FR 36384, Sept. 17, 1984]
(a) No operator may transport any hazardous liquid that would corrode
the pipe or other components of its pipeline system, unless it has
investigated the corrosive effect of the hazardous liquid on the system and
has taken adequate steps to mitigate corrosion.
(b) If corrosion inhibitors are used to mitigate internal corrosion the
operator shall use inhibitors in sufficient quantity to protect the entire
part of the system that the inhibitors are designed to protect and shall also
use coupons or other monitoring equipment to determine their effectiveness.
(c) The operator shall, at intervals not exceeding 7-1/2 months, but at
least twice each calendar year, examine coupons or other types of monitoring
equipment to determine the effectiveness of the inhibitors or the extent of
(d) Whenever any pipe is removed from the pipeline for any reason, the
operator must inspect the internal surface for evidence of corrosion. If the
pipe is generally corroded such that the remaining wall thickness is less than
the minimum thickness required by the pipe specification tolerances, the
operator shall investigate adjacent pipe to determine the extent of the
corrosion. The corroded pipe must be replaced with pipe that meets the
requirements of this part or, based on the actual remaining wall thickness,
the operating pressure must be reduced to be commensurate with the limits on
operating pressure specified in the subpart.
[Amdt. 195-22, 46 FR 38360, July 27, 1981, as amended by Amdt. 195-20B, 46 FR
38922. July 30, 1981; Amdt. 195-24, 47 FR 46852, Oct. 21, 1982]