And tying B suction nozzle to pump suction would be far easier than shifting the water which, given typical tanks, would leave you with two half full tanks and I need of a large pump. KISS and if feasible run some pipe and throw in a cv and os&y.
Sent from my iPhone On May 16, 2013, at 2:57 PM, "craig.pr...@ch2m.com" <craig.pr...@ch2m.com> wrote: > How much time do you get in 8 hours to re-fill the tank? 8 (eight) hours or > 480 minutes or 28,800 seconds, or however else you want to slice it. That's > how much time you've got to refill the tank. > > If tank "A" is the primary tank and supplies the required duration and you > erect a backup tank adjacent to it as redundant and you drain tank "A", dump > tank "B" into "A" and you've met the 8 hour requirement with no problem. > Then however long it takes to fill tank "B" is of no consequence because it > is not the primary supply for the system. Now if you have an event on day > one of the 3-day re-fill of tank "B" and tank "A" is empty again, then you've > got an issue. But you've also probably been attacked and overrun by alien > zombies so no one will care. > > > > Craig L. Prahl, CET > Fire Protection > CH2MHILL > Lockwood Greene > 1500 International Drive > Spartanburg, SC 29304-0491 > Direct - 864.599.4102 > Fax - 864.599.8439 > CH2MHILL Extension 74102 > craig.pr...@ch2m.com > > > -----Original Message----- > From: sprinklerforum-boun...@lists.firesprinkler.org > [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Brad > Casterline > Sent: Thursday, May 16, 2013 2:43 PM > To: sprinklerforum@lists.firesprinkler.org > Subject: RE: NFPA 22 2013 Water storage re-fill time. > > ok good, now then, if you are/were an A.H.J., how would you answer this > question: "How much time do we get to be able to re-fill a water storage tank > in 8 hours"? for example, 150,000 gallon capacity for demand*duration, say > tank A, from which the pump takes suction. Now we build a twin tank B, and > connect to tank A with 8" pipe with a shut-off valve normally closed. > There is an event and tank A runs dry. We open the shut-off valve and tank A > is re-filled in about 18 minutes. The well pump then starts refilling tank B, > which will take 3 days. So the question is "how much time do we get to be > able to re-fill the tank within in 8 hours?". > > -----Original Message----- > From: Brad Casterline [mailto:bcasterl...@fsc-inc.com] > Sent: Thursday, May 16, 2013 8:18 AM > To: sprinklerforum@lists.firesprinkler.org > Subject: NFPA 22 2013 Water storage re-fill time. > > asking for a co-worker: > > > > 1) Why are water storage tanks required to be re-filled in 8 hours? > > 2) Would the requirement apply to ponds (man-made with liner in this case)? > > 3) Are there any alternatives to the requirement? > > > > (the pond is large and filled by a well pump with a pumping rate that would > take more than 8 hours) > > > > many thanks, > > > > Brad Casterline, NICET IV > > Fire Protection Division > > > > FSC, Inc. > > P: 913-722-3473 > > bcasterl...@fsc-inc.com > > www.fsc-inc.com > > > > Engineering Solutions for the Built Environment > > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
