Distribution line valves.

(a)Each high-pressure distribution system must have valves spaced so as to reduce the time to shut down a section of main in an emergency. The valve spacing is determined by the operating pressure, the size of the mains, and the local physical conditions.#

(b)Each regulator station controlling the flow or pressure of gas in a distribution system must have a valve installed on the inlet piping at a distance from the regulator station sufficient to permit the operation of the valve during an emergency that might preclude access to the station.#

(c)Each valve on a main installed for operating or emergency purposes must comply with the following:#

(1)The valve must be placed in a readily accessible location so as to facilitate its operation in an emergency.#

(2)The operating stem or mechanism must be readily accessible.#

(3)If the valve is installed in a buried box or enclosure, the box or enclosure must be installed so as to avoid transmitting external loads to the main.#