MINIMUM SEPARATION REQUIREMENTS FOR ABOVE-GROUND TANKS
|CLASS OF LIQUID |
AND TANK TYPE
|INDIVIDUAL TANK |
BUILDING ON SAME
LOT LINE THAT IS
OR CAN BE BUILT
SIDE OF A PUBLIC
NEAREST SIDE OF
ANY PUBLIC WAY
|Class I protected |
|Less than or equal |
|Greater than 6,000||15||25a||25||15||3|
|Class II and III protected |
|Same as Class I||Same as Class I||Same as Class Ic||Same as Class I||Same as Class I||Same as Class I|
|Tanks in vaults||0–20,000||0b||0||0b||0||Separate compartment |
Exception: A listed automatic-closing-type hose nozzle valve with latch-open device is allowed to be used on overhead-type dispensing units where the design of the system is such that the hose nozzle valve will close automatically in the event the valve is released from a fill opening or upon impact with a driveway.
Exception: Vapor recovery nozzles incorporating insertion interlock devices designed to achieve shutoff on disconnect from the vehicle fill pipe.
Means shall be provided to shut down fuel dispensing in the event the vapor return line becomes blocked.
Existing and new vent piping shall be in accordance with Sections 5703.6 and 5704.2. Vapor return piping shall be installed in a manner that drains back to the tank, without sags or traps in which liquid can become trapped. If necessary, because of grade, condensate tanks are allowed in vapor return piping. Condensate tanks shall be designed and installed so that they can be drained without opening.
An approved shear joint shall be rigidly mounted and connected by a union in the vapor return piping at the base of each dispensing device. The shear joint shall be mounted flush with the top of the surface on which the dispenser is mounted.
Vapor-processing systems that introduce air into the underground piping or storage tanks shall be provided with equipment for prevention of flame propagation that has been tested and listed as suitable for the intended use.
Exception: Where the required distances to buildings, lot lines or fuel-transfer areas cannot be obtained, means shall be provided to protect equipment against fire exposure. Acceptable means shall include but not be limited to:
Exception: Dispensing equipment need not be separated from canopies that are constructed in accordance with the International Building Code and that provide weather protection for the dispensing equipment.
SEPARATION DISTANCE FOR ATMOSPHERIC VENTING OF CNG
|EQUIPMENT OR FEATURE||MINIMUM SEPARATION (feet)|
|CNG compressor and storage vessels||25|
The vent tube shall be capable of dispersing the gas a minimum of 10 feet (3048 mm) above grade level. The vent tube shall not be provided with a rain cap or other feature which would limit or obstruct the gas flow.
In addition to the requirements in Section 2311, the owner of a self-service hydrogen motor fuel-dispensing facility shall provide for the safe operation of the system through the institution of a fire safety plan submitted in accordance with Section 404, the training of employees and operators who use and maintain the system in accordance with Section 406, and provisions for hazard communication in accordance with Section 407.
NO SMOKING—STOP ENGINE WHILE FUELING,
SHUT OFF ELECTRICITY
DO NOT START ENGINE UNTIL AFTER BELOW
DECK SPACES ARE VENTILATED.
Vehicles powered by gaseous fuels in which the fuel system has been damaged shall be inspected and evaluated for fuel system integrity prior to being brought into the repair garage. The inspection shall include testing of the entire fuel delivery system for leakage.
Ventilation shall be by a continuous mechanical ventilation system or by a mechanical ventilation system activated by a continuously monitoring natural gas detection system or, for hydrogen, a continuously monitoring flammable gas detection system, each activating at a gas concentration of not more than 25 percent of the lower flammable limit (LFL). In all cases, the system shall shut down the fueling system in the event of failure of the ventilation system.
The ventilation rate shall be at least 1 cubic foot per minute per 12 cubic feet [0.00139 m3 × (s • m3)] of room volume.