It's not, just a rule of thumb that works well enough. To answer your original question of why that number though I can't say. You can be down to 3/4 of a tank but that still leaves 6 hours by the formula. Considering automatic supplies in the rule perhaps? Why not an exception for a stored water only source then? Assuming going to half or less a tank between refills? That certainly happens. Enquiring minds want to know.
On Wed, Dec 8, 2010 at 7:28 AM, Fairchild, Jack <jfairch...@ballinger-ae.com> wrote: > Yup, according to the appendix that equates to 8 hours. Never knew fuel burn > was a linear relation to horsepower. :) > > Jack Fairchild > > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of isam hboubate > Sent: Wednesday, December 08, 2010 10:14 AM > To: sprinklerforum@firesprinkler.org > Subject: Re: Diesel fuel tank capacities > > Hi Jack, > As per NFPA 20 > 8-4.3* Fuel Tank Capacity. > Fuel supply tank(s) shall have a capacity at least equal to 1 gal per > horsepower > (5.07 L/kW), plus 5 percent volume for expansion and 5 percent volume for > sump. > Larger-capacity tanks could be required and shall be determined by prevailing > conditions, such as refill cycle and fuel heating due to recirculation, and > shall be subject to special conditions in each case. The fuel supply tank and > fuel shall be reserved exclusively for the fire pump diesel engine. > > regards > Issam > > > > ________________________________ > From: "Fairchild, Jack" <jfairch...@ballinger-ae.com> > To: "sprinklerforum@firesprinkler.org" <sprinklerforum@firesprinkler.org> > Sent: Wed, December 8, 2010 6:31:43 PM > Subject: Diesel fuel tank capacities > > Does anyone know why the fuel supply capacity for diesel fire pumps and > emergency generators is 8 hours, when the maximum water supply duration I can > find is 150 minutes? Is this because fuel tanks not kept full? > > Jack Fairchild > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > > > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 rgreen...@bates.ctc.edu http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
