These rules shall apply to all pipelines utilized in the actual drilling or operation of oil and/or natural gas wells, the producing of oil and/or natural gas wells, and the transportation of leasehold gas as more fully described herein, excepting however, those oil and/or natural gas pipelines covered by the Hazardous Materials Transportation Act ( 49 U.S.C. sections 1802 et seq.) or the Natural Gas Pipeline Safety Act ( 49 U.S.C. sections 1671, et seq.).