Internal corrosion control

MIL-HDBK-1004/10

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

thickness.

(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]

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N 195.418

Internal corrosion control.

(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

any corrosion.

(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]

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