APPENDIX E (continued)
(b) Localized graphitization. Each segment of cast iron or ductile
iron pipe on which localized graphitization is found to a degree where any
leakage might result, must be replaced or repaired or sealed by internal
sealing methods adequate to prevent or arrest any leakage.
(a) Each operator shall maintain records or maps to show the
location of cathodically protected piping, cathodic protection facilities,
other than unrecorded galvanic anodes installed before August 1, 1971, and
neighboring structures bonded to the cathodic protection system.
(b) Each of the following records must be retained for as long as
the pipeline remains in service:
Each record or map required by paragraph (a) of this
(2) Records of each test, survey, or inspection required by
this subpart, in sufficient detail to demonstrate the adequacy of corrosion
control measures or that a corrosive condition does not exist.
[Amdt. 192-4, 36 FR 12302, June 30, 1971, as amended by Amdt. 192-33, 43 FR
39390, Sept. 5, 1978]
Appendix D - Criteria For Cathodic Protection And Determination Of
Criteria for cathodic protection
Steel, cast iron, and ductile iron structures.
(1) A negative (cathodic) voltage of at least 0.85 volt, with
reference to a saturated copper-copper sulfate half cell. Determination of
this voltage must be made with the protective current applied, and in
accordance with sections II and IV of this appendix.
(2) A negative (cathodic) voltage shift of at least 300 millivolts.
Determination of this voltage shift must be made with the protective current
applied, and in accordance with sections II and IV of this appendix. This
criterion of voltage shift applies to structures not in contact with metals of
different anodic potentials.
(3) A minimum negative (cathodic) polarization voltage shift of 100
millivolts. This polarization voltage shift must be determined in accordance
with sections III and IV of this appendix.