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Diesel Fuel tank – Section 11.4

The diesel fuel tank is required to provide the appropriate amount of fuel to ensure the proper running duration time of the diesel engine-driven fire pump.

Diesel Fuel supply tanks should be located and installed above ground in accordance with municipal or other ordinances and in accordance with requirements of the authority having jurisdiction.

Connect fuel supply and return line separately from engine to the Fuel tank. Fuel pipes should not be galvanized steel or copper.

Normal vents shall be 2 in. (50 mm) NPT or sized in accordance with ANSI/UL 142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids, or other approved standards. As an alternative to the requirement, the normal vent should be at least as large as the largest filling or withdrawal connection, but no case should it be less than 11∕4 in. (32 mm) nominal inside diameter.

The supply tank should be located so the fuel supply pipe connection to the engine is no lower than the level of the engine fuel transfer pump so that the fuel availability is assumed to the entry of the fuel pump and to avoid any entrapment of air which could damage the fuel pump. For Downpipe of fuel tank return line, it is recommended to terminate 3” – 6” (76.2mm – 152.4mm) from tank bottom to prevent foaming inside the tank.* Fuel supply tank(s) shall have a capacity at least equal to 1 gal per hp (5.07 L per kW), plus 5 percent volume for expansion and 5 percent volume for sump. Tanks shall be single wall or double wall and shall be designed and constructed in accordance with recognized engineering standards such as ANSI/UL 142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids.