APPENDIX E (continued)
Be applied on a properly prepared surface;
(2) Have sufficient adhesion to the metal surface to
effectively resist underfilm migration moisture;
Be sufficiently ductile to resist cracking;
(4) Have sufficient strength to resist damage due to handling
and soil stress; and
Have properties compatible with any supplemental cathodic
(b) Each external protective coating which is an electrically
insulating type must also have low moisture absorption and high electrical
(c) Each external protective coating must be inspected just prior
to lowering the pipe into the ditch and backfilling, and any damage
detrimental to effective corrosion control must be repaired.
(d) Each external protective coating must be protected from damage
resulting from adverse ditch conditions or damage from supporting blocks.
(e) If coated pipe is installed by boring, driving, or other
similar method, precautions must be taken to minimize damage to the coating
(a) Each cathodic protection system required by this subpart must
provide a level of cathodic protection that complies with one or more of the
applicable criteria contained in Appendix D of this part. If none of these
criteria is applicable, the cathodic protection system must provide a level of
cathodic protection at least equal to that provided by compliance with one or
more of these criteria.
(b) If amphoteric metals are included in a buried or submerged
pipeline containing a metal of different anodic potential-
(1) The amphoteric metals must be electrically isolated from
the remainder of the pipeline and cathodically protected; or
(2) The entire buried or submerged pipeline must be
cathodically protected at a cathodic potential that meets the requirements of
Appendix D of this part for amphoteric metals.
(c) The amount of cathodic protection must be controlled so as not
to damage the protective coating or the pipe.