(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, the following requirements apply.
(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 requirements of sections 255.485, 255.487 or 255.489 of this Part.
(3) Steps must be taken to minimize the internal corrosion.