255.481 Atmospheric corrosion control: monitoring.

(a)Each operator must inspect each pipeline or portion of pipeline that is exposed to the atmosphere for evidence of atmospheric corrosion, as follows:#

If the pipeline is located: | Then the frequency of inspection is: Onshore Other than a Service Line | At least once every 3 calendar years, but with intervals not exceeding 39 months Onshore Service Line | At least once every 5 calendar years, but within intervals not exceeding 63 months Offshore | At least once each calendar year, but with intervals not exceeding 15 months#

(b)During inspections the operator 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.#

(c)If atmospheric corrosion is found during an inspection, the operator must provide protection against the corrosion as required by section 255.479 of this Part.#