2306.10 Installation of underground tank and piping systems.
FC § 2306.10
The installation of tank and piping systems shall be in accordance with FC Chapter 57, except as otherwise specified in this section.
1.Tanks shall be located so that the forces from building foundations and support loads are not transmitted to the tanks. The distance from any part of a tank to the nearest wall of any basement, pit, cellar or any property line shall not be less than 3 feet (914 mm). Tanks shall not be placed less than 20 feet (6096 mm) from a subway wall.
2.Tanks shall be installed so that the highest point of the tank is not less than 2 feet (609.6 mm) below the level of the lowest cellar floor of any building within a radius of 10 feet (3048 mm) from the tank. No tank shall be located under a sidewalk or beyond the property line of the liquid motor fuel-dispensing faility.
3.Tanks shall be placed on a 12-inch (305-mm) thick base slab approved by the Department of Buildings, or installed in such other manner as may be approved by the Commissioner of Buildings, and secured against flotation. The system used for anchoring the tank shall not damage the tank or its coating.
4.Tanks shall be placed on a bed of approved backfill material in accordance with manufacturer's specifications. The backfill material shall evenly and completely support the bottom quadrant of the tank. The backfill material shall be carefully placed along the bottom, under the sides and under the end caps or heads of the tank, by shoveling and tamping. Backfilling shall then be completed in 12-inch (305-mm) lifts placed uniformly around the tank. Provision shall be made, consistent with site conditions, to prevent the migration of backfill.
5.Tanks shall be covered with a reinforced concrete slab not less than 8 inches (203 mm) thick, which shall extend not less than 12 inches (305 mm) beyond the horizontal outlines of the tank. The support of the top slab shall be of a design approved by the Department of Buildings.
6.Fill, suction and discharge piping shall be encased in 4 inches (102 mm) of concrete or covered by a minimum of 18 inches (457 mm) of manufacturer-approved backfill, or covered by 4 inches (102 mm) of manufacturer-approved backfill and an 8-inch (203-mm) reinforced concrete slab.
7.Not more than 40,000 gallons (151 400 L) of liquid motor fuel shall be stored at any facility, including liquid motor fuel stored in aboveground tanks.
8.Tanks containing identical products may be wet-manifolded provided that the total aggregate capacity of such tanks does not exceed 12,000 gallons (45 420 L) of liquid motor fuel, and each tank is provided with its own submersible pump.
9.Tank connections shall be designed and located so as to: 9.1. Minimize the maneuvering necessary to position a cargo tank to make the delivery. 9.2. Minimize obstructing a public right of way or motorists' view of roadways, or impeding the movement of motor vehicles or pedestrians, during deliveries. 9.3. Provide connections by means of approved liquid- and vapor-tight connections.
10.Tanks installed underground indoors shall be provided with an approved liquid level-indicating device. Liquid level-indicating devices shall be designed and constructed to prevent the escape of liquid or vapor and shall be approved.
11.Test wells shall be prohibited in tanks located underground indoors. Unused tank openings shall be permanently sealed at the tank to prevent removal of plugs or covers.
12.Secondary containment piping shall be required on all nonmetallic product-carrying pipes except direct fill lines, suction lines or siphon lines containing only one check valve located at the highest point of the line.
13.Underground piping shall have a slope of not less than 1/8 inch per foot (10.4 mm per meter) pitched toward the tank and shall be installed so as to facilitate initial and periodic testing.
14.Flexible joints shall be installed in accordance with FC 5703.6.9.
15.Each underground motor fuel storage tank shall be provided with a separate unobstructed vent line without any trap or device that causes excessive back pressure.
16.Vent piping shall be installed not less than 12 inches (305 mm) below the finished surface measured from the point where the piping rises vertically and shall slope toward the tank.
17.Vent outlets shall discharge outdoors and upward. The discharge point shall be no less than 15 feet (4572 mm) above the adjacent ground level and no less than 10 feet (3048 mm) from the nearest building opening.
18.An approved overfill prevention device shall be provided to prevent overfilling. When installed in diesel fuel tanks, such overfill prevention device shall be designed to withstand the pressure generated by the cargo tank discharge pump and shall automatically shut off the flow into the tank when the tank is not more than 95 percent full.
19.Each tank shall be provided with one fill connection only, unless approved. Each tank fill connection shall be provided with a catchment basin with a capacity of at least 15 gallons (56.8 L). The contents of the catchment basin shall be automatically drained into the tank without overfilling the tank after the transfer from the cargo tank is completed provided, however, that if the Stage II vapor recovery system approved for the tank does not allow for the installation of an automatic drain, a manual drain may be installed.
20.Where the discharging piping leak detector required by FC 2306.7.7(4) does not cause shutdown of the liquid motor fuel pump, secondary containment piping shall be provided.
