5706.2.4.3 Location.

Tanks containing flammable or combustible liquids shall be kept outdoors and at least 50 feet (15 240 mm) from buildings, combustible material and combustible waste. Additional distance shall be provided when necessary to ensure that vehicles, equipment and containers being filled directly from such tanks will not be less than 50 feet (15 240 mm) from structures or combustible storage.

5706.2.5 Type of tank.

Tanks shall be provided with top openings only.

   Exception: Aerial crane refueling operations when conducted in accordance with FC 5706.2.5.2.

5706.2.5.1 Tanks with top openings only.

Tanks with top openings shall be mounted as follows:

   1.   On well-constructed metal legs connected to shoes or runners designed so that the tank is stabilized and the entire tank and its supports can be moved as a unit; or

   2.   For stationary tanks, on a stable base of timbers or blocks approximately 6 inches (152 mm) in height which prevents the tank from contacting the ground.

5706.2.5.1.1 Pumps and fittings.

Tanks with top openings only shall be equipped with a tightly and permanently attached, approved pumping device having an approved hose of sufficient length for filling construction equipment or containers to be served from the tank. Either the pump or the hose shall be equipped with a padlock to its hanger to prevent tampering. An antisiphoning device shall be provided in the pump discharge unless a self-closing nozzle is used. Siphons or internal pressure discharge devices shall not be used.

5706.2.5.2 Tanks for gravity discharge.

Tanks with a connection in the bottom or the end for gravity-dispensing liquids for aerial crane refueling operations shall be mounted and equipped as follows:

   1.   Support lugs used to elevate the tank for gravity discharge shall be designed to carry all required loads and provide stability.

   2.   Bottom or end openings for gravity discharge shall be equipped with a valve located adjacent to the tank shell which will close automatically in the event of fire through the operation of a heat-activated releasing device. Where this valve cannot be operated manually, it shall be supplemented by a second, manually operated valve.

   3.   The gravity discharge outlet shall be provided with an approved hose equipped with a self-closing valve at the discharge end of a type that can be padlocked to its hanger.

5706.2.6 Spill control drainage control and diking.

Indoor storage and dispensing areas shall be provided with spill control and drainage control as set forth in FC 5703.4. Outdoor storage areas shall be provided with drainage control or diking as set forth in FC 5704.2.10.