49 CFR §195.583

1. (a)You must inspect each pipeline or portion of pipeline that is exposed to the atmosphere for evidence of atmospheric corrosion, as follows:
2. (b)During inspections you must give particular attention to pipe at soil-to-air interfaces, under thermal insulation, under disbonded coatings, at pipe supports, in splash zones, at deck penetrations, and in spans over water.
3. (c)If you find atmospheric corrosion during an inspection, you must provide protection against the corrosion as required by § 195.581.