(a) No person may operate a segment of pipeline, unless it is maintained in accordance with this Part.

(b) Each segment of pipeline that becomes unsafe must be replaced, repaired or removed from service.

(c) The provisions of: sections 255.705, 255.706, 255.709, 255.711, 255.713, 255.715, 255.717 and 255.719 of this Part shall pertain, as applicable, to all transmission lines, and all distribution mains operating at 125 psig (862 kPa) or more in Class 3 and 4 locations.