Don’t forget that, along with your pump(s) churn, the high water level in the tank must be used to determine maximum downstream system pressure.
Sent from my iPhone > On May 7, 2021, at 4:06 PM, Mark.Phelps via Sprinklerforum > <[email protected]> wrote: > > So, if this same tank and pump were at the same elevation and 5 blocks > away in a Water Utility Yard owned by the city water department, what > pressure and flow rate would one use to design a sprinkler system? > > Mark at Aero > 602 820-7894 > > -----Original Message----- > From: Sprinklerforum <[email protected]> On > Behalf Of Bob Caputo via Sprinklerforum > Sent: Friday, May 7, 2021 11:21 AM > To: [email protected] > Cc: Bob Caputo <[email protected]> > Subject: [EXTERNAL] Re: Available Pressure from Fire Water Storage Tank > > 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 < >> [email protected]> 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 >> [email protected] >> >> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttp-3A__lists.firesprinkle&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=FlAYNVXV%2BQH9O6XoNg%2F%2B7OHZUG29BMzeAKphsphf2ZI%3D&reserved=0 >> r.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwICAg&c=wn3mZ >> QLIuInh2ClcJ0_DIA&r=dLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg&m=sbcv >> VKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14&s=xW_3DXTpaglGRp_Lod9_4SygFCmo >> JqtVkLeqtK_Eczg&e= >> > -- > Bob Caputo, CFPS > *President* > > *American Fire Sprinkler Association* > p: 214-349-5965 ext124 > w: firesprinkler.org > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.facebook.com_firesprinkler.org_%26d%3DDwICAg%26c%3Dwn3mZQLIuInh2ClcJ0_DIA%26r%3DdLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg%26m%3DsbcvVKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14%26s%3D9_q6urq9zEQtQy7i4Nd_rk4BBZBOiJsNCVSFRpcdMjg%26e%3D&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=fPOTiCmyAbs07sjP34NbIX7stz2agQqcyAa56fUGN34%3D&reserved=0 > > > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__twitter.com_afsa_status_1039528345367732224%26d%3DDwICAg%26c%3Dwn3mZQLIuInh2ClcJ0_DIA%26r%3DdLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg%26m%3DsbcvVKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14%26s%3DPSOMCv00HpTP3bMjgG5Wczk2iOEH35yxgU-i0lh4kvM%26e%3D&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Rmy7Q8bvkrAmSoUXygiWg9mUbkGmdnQRaO%2Fj%2Bt1onAg%3D&reserved=0 > > > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.linkedin.com_company_american-2Dfire-2Dsprinkler-2Dassociation-2Dafsa-2D_%26d%3DDwICAg%26c%3Dwn3mZQLIuInh2ClcJ0_DIA%26r%3DdLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg%26m%3DsbcvVKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14%26s%3D4hyISelb176OLCvYsOKsSvSbu842IyJoPrQ706vZmVA%26e%3D&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=4nsyugKpe8Ijoms6d7zzuEPlTZPbG7X6qxaJI%2FFnS5s%3D&reserved=0 > > > > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.instagram.com_firesprinklerorg_%26d%3DDwICAg%26c%3Dwn3mZQLIuInh2ClcJ0_DIA%26r%3DdLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg%26m%3DsbcvVKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14%26s%3DWnV3x7dwAvD344IBMMjlrMdRQMfoQ8YIBkyVCR4kNW4%26e%3D&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=liD5AzsGZ302cheWcG%2FS3ZQyf%2BT%2FQ5k4%2B1bdtzlJpj8%3D&reserved=0 > > > > *Train a safer, more efficient workforce.* > > By enrolling your employees in the AFSA Apprenticeship Training Series for > Sprinkler Fitters > <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.firesprinkler.org_WWW_Education_Apprentice-5FTraining_WWW_Education_Apprenticeship-5FTraining.aspx-3Fhkey-3De88ef09e-2Dd74c-2D407f-2Dabcd-2D995aff866149%26d%3DDwICAg%26c%3Dwn3mZQLIuInh2ClcJ0_DIA%26r%3DdLwiR71i_XhSFqam3ZLeaFLiQJ3cDTUB0ReB4-yDDcg%26m%3DsbcvVKDiY86Z6_d0cmGpUAE-yKbUHdvwJfxJIwZih14%26s%3D_6Tmf4i1Euk-al8jqF5PF4JDRqcO13XAFZjt64gY110%26e%3D&data=04%7C01%7Crhinson%40burnsmcd.com%7C16898695b528484c6ff408d9119c046e%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637560184075025189%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=SuPAj%2Fyye2CRcdapnFjotoWgBpQnsrP8gHWwBk5DyKA%3D&reserved=0 > >, 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. 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