Certain gas utilities shall file plans for inspection and maintenance of pipeline facilities; revision of plans

(a) Each gas utility that engages in the transportation of gas or which owns or operates pipeline facilities not subject to the jurisdiction of the Federal Power Commission under the Natural Gas Act shall file with the Office of Regulatory Staff a plan for inspection and maintenance of each pipeline facility owned or operated by the gas utility, and any changes in the plan, in accordance with regulations prescribed by the commission. (b) The commission may by regulation also require any gas utility which engages in the transportation of gas or which owns or operates pipeline facilities subject to the provisions of this article to file its plan for approval with the Office of Regulatory Staff. (c) If at any time the Commission finds that the plan is inadequate to achieve safe operation it shall, after notice and opportunity for a hearing, require the plan to be revised. The plan required by the Commission shall be practicable and designed to meet the need for pipeline safety. In determining the adequacy of any plan, the Commission shall consider: (1) relevant, available pipeline safety data; (2) whether the plan is appropriate for the particular type of pipeline transportation; (3) the reasonableness of the plan; and (4) the extent to which the plan will contribute to public safety.