If you didn't have a pump at all and put the same tank 100' above ground, you'd calculate to the minimum anticipated water level after demand x duration is subtracted from the fill turn on point would you not? What would make this any different? Genuine question, I've always used minimum water after duration x demand as my water elevation and thus suction pressure.
Mike Morey CFPS 3229 * NICET S.E.T. 123677 Project Manager * Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive * Fort Wayne, IN * 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email mmo...@shambaugh.com -----Original Message----- From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Bob Caputo via Sprinklerforum Sent: Friday, May 7, 2021 2:21 PM To: sprinklerforum@lists.firesprinkler.org Cc: Bob Caputo <bcap...@firesprinkler.org> Subject: Re: Available Pressure from Fire Water Storage Tank BE ADVISED - This email originated outside EMCOR. No, you are not permitted to use elevation pressure from a gravity tank. You do not know the elevation of the water in the tank which is depleted during the operation of the systems in fighting the fire. You are permitted to use the pumps productive curve at 150% of rated flow and 65% of rated pressure On Fri, May 7, 2021 at 11:13 AM Kyle.Montgomery via Sprinklerforum < sprinklerforum@lists.firesprinkler.org> wrote: > I'm working on a project where they are adding a new building to an > existing campus. There is an existing fire water storage tank and fire > pump that serves the site underground fire loop. The new building has > a very demanding sprinkler system that just barely exceeds the fire > pump's pressure available at the demand flow (using just the pump > curve as the water supply). > > Normally, I would be conservative and use just a few psi as my water > supply from the tank (as though it were nearly empty). But, is that > overly conservative? The tank is mounted on the ground, at the same > elevation as the fire pump, but it is nearly 45 feet tall, with a > total capacity of over > 500,000 gallons. Can I use some of that elevation pressure, or do I > need to design and calc as though the tank is nearly depleted? > > -Kyle M > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > > https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cg > i/sprinklerforum-firesprinkler.org__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKA > a_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0gy0_Q9T8$ > -- Bob Caputo, CFPS *President* *American Fire Sprinkler Association* p: 214-349-5965 ext124 w: https://urldefense.com/v3/__http://firesprinkler.org__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0gwxnxtdZ$ <https://urldefense.com/v3/__https://www.facebook.com/firesprinkler.org/__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0g0ODmqgj$ > <https://urldefense.com/v3/__https://twitter.com/afsa/status/1039528345367732224__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0g05HKijt$ > <https://urldefense.com/v3/__https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0g16NvBL1$ > <https://urldefense.com/v3/__https://www.instagram.com/firesprinklerorg/__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0gyzgiHw2$ > *Train a safer, more efficient workforce.* By enrolling your employees in the AFSA Apprenticeship Training Series for Sprinkler Fitters <https://urldefense.com/v3/__https://www.firesprinkler.org/WWW/Education/Apprentice_Training/WWW/Education/Apprenticeship_Training.aspx?hkey=e88ef09e-d74c-407f-abcd-995aff866149__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0g0qznzuU$ >, you will reap the benefits of a qualified, professional installation crew. Well-trained employees will work smarter, increasing your company's productivity and, in turn, its profits. Learn more <https://urldefense.com/v3/__https://www.firesprinkler.org/WWW/Education/Apprentice_Training/WWW/Education/Apprenticeship_Training.aspx?hkey=e88ef09e-d74c-407f-abcd-995aff866149__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0g0qznzuU$ > . _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org__;!!FaxH778!MwmcS9Z6kdvSk8BBDvSEZKAa_lVQdX5itceWIZ5JlOctBXBJRTpTUhR0gy0_Q9T8$ This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
