Internal corrosion control: General

MIL-HDBK-1004/10

APPENDIX E (continued)

N 192.473

External corrosion control: Interference currents.

(a) Each operator whose pipeline system is subjected to stray

currents shall have in effect continuing program to minimize the detrimental

effects of such currents.

(b) Each impressed current type cathodic protection system or

galvanic anode system must be designed and installed so as the minimize any

adverse effects on existing adjacent underground metallic structures.

[Amdt. 192-4, 36 FR 12302, June 30, 1971, as amended by Amdt. 192-33, 43 FR

39390, Sept. 5, 1978]

N 192.475 Internal corrosion control: General.

(a) Corrosive gas may not be transported by pipeline, unless the

corrosive effect of the gas on the pipeline has been investigated and steps

have been taken to minimize internal corrosion.

(b) Whenever any pipe is removed from a pipeline for any reason,

the internal surface must be inspected for evidence of corrosion. If internal

corrosion is found.-

(1) The adjacent pipe must be investigated to determine the

extent of internal corrosion:

(2) Replacement must be made to the extent required by the

applicable paragraphs of NN 192.485, 192.487, or 192.489; and

(3)

Steps must be taken to minimize the internal corrosion.

(c) Gas containing more than 0.1 grain of hydrogen sulfide per 100

standard cubic feet may not be stored in pipe-type or bottle-type holders.

[Amdt. 192-4, 36 FR 12302, June 30, 1971, as amended by Amdt. 192-33, 43 FR

39390, Sept. 5, 1978]

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N 192.477

Internal corrosion control: Monitoring.

If corrosive gas is being transported, coupons or other suitable

means must be used to determine the effectiveness of the steps taken to

minimize internal corrosion. Each coupon or other means of monitoring

internal corrosion must be checked two times each calendar year, but with

intervals not exceeding 7-1/2 months.

[Amdt. 192-33, 43 FR 39390, Sept. 5, 1978]

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