Brad, The eight hours is a normal work day. An employee could come in, open a manual valve and fill the tank in a normal shift. Yes the requirements would apply to a pond. A water supply that is empty is of little use to the fire protection system it supplies. If the well takes more than 8 hours to fill the pond, to the capacity needed for the fire pump only, then another means (tanker trucks) would have to be employed.
The double tank senerio is interesting. The water supply would be re-filled in 18 mins well under the 8 hrs allowed. Tank B can be refilled at any rate once tank A is 100%, because the water supply has been returned to normal. Duane Fox, Jr Current AHJ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Thursday, May 16, 2013 2:43 PM To: [email protected] 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:[email protected]] Sent: Thursday, May 16, 2013 8:18 AM To: [email protected] 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 [email protected] www.fsc-inc.com Engineering Solutions for the Built Environment _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
