§ 14.3. Piping and ancillary equipment.
(a) A means for determining the liquid level in each tank shall be provided and this means shall be accessible to the delivery operator. A means to sound an audible alarm when the liquid level in the tank reaches 90% of capacity shall be provided. A means either to automatically stop the flow of liquid into the tank when the liquid level in the tank reaches 98% of capacity or to restrict the flow of liquid into the tank to a maximum 2.5 gpm when the liquid in the tank reaches 95% capacity shall also be provided. These provisions may not restrict or interfere with the proper operation of either the normal vent or the emergency vent.
(b) Fuel may not be dispensed from the tank by either gravity flow or pressurization of the tank. A means to prevent the release of liquid by siphon flow shall be provided.
(c) If the tank is at an elevation that produces a gravity head on the dispensing device, the tank outlet shall be equipped with a device that will prevent gravity flow from the tank to the dispenser, such as a normally closed solenoid valve. This device shall be located adjacent to and downstream of the outlet valve specified by 2-3.8.1 of NFPA 30, Flammable and Combustible Liquids Code. The device shall be installed and adjusted so that liquid cannot flow by gravity from the tank to the dispenser in the event of failure of the piping or hose when the dispenser is not in use.
(d) If a submersible pump system is used, a listed emergency shutoff valve shall be installed, as required by 4-3.6 of NFPA 30A, Automotive and Marine Service Station Code.
(e) If a suction pump-type dispensing device is used, a listed, vacuum-actuated shutoff valve, with a shear section, or equivalent-type valve shall be installed directly under each dispensing device. Tanks installed in below grade vaults are not required to comply with this section.
(f) Shutoff and check valves shall be equipped with a pressure-relieving device that will relieve the pressure generated by thermal expansion back to the tank.
(g) Piping shall be routed so that exposure to physical damage is minimized.
Cross References This section cited in 37 Pa. Code § 14.1 (relating to installation of vaults for the storage of flammable and combustible liquids).
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