37 Pa. Code § 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.
Notes
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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