NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
(OP)
I seem to be getting conflicting explanations for this 5% sump. On the face of it, it would appear that this sump volume is to prevent debris from getting into the fuel line. However my fire pump supplier is saying this is something built into the design of the tank and has more to do with head pressure at the outlet.
Could someone elucidate?
Regards
Dave
Could someone elucidate?
Regards
Dave
Regards
D
A thing moderately good is not so good as it ought to be
Thomas Paine





RE: NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
RE: NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
Regards
D
A thing moderately good is not so good as it ought to be
Thomas Paine
RE: NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
11.4.1.2.9.1 The fuel supply pipe connection shall be located on a SIDE of the tank.
11.4.1.2.9.2 The engine fuel supply (suction) pipe connection shall be located on the tank so that 5 percent of the tank volume provides a sump volume not usable by the engine.
RE: NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
The 5 percent sump in the fuel tank is provided for any sediment or condensation that may be in the tank. By position the supply connection to the engine on the side of the tank at an elevation no lower than the engine fuel pump the plumbing to the engine is always under a small head pressure. In the event of a leak, fuel will escape and be observed. This method is preferred to air being drawn in, resulting in the possible loss of engine prime, if the supply line is under negative pressure.
RE: NFPA 20 - 5% volume for sump in fuel tank Fig A 11.4.4
I have that handbook on site too but damn if my supplier shouldn't be all over this.
Regards
D
A thing moderately good is not so good as it ought to be
Thomas Paine