The difference would be that you are NOT 100 ft above ground. You have a ground suction tank where the water level might only be a foot or two above ground.
Apples and oranges. Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | [email protected] | www.jacobs.com 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: email or MS TEAMS -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Mike Morey via Sprinklerforum Sent: Friday, May 7, 2021 2:40 PM To: [email protected] Cc: Mike Morey <[email protected]> Subject: [EXTERNAL] RE: Available Pressure from Fire Water Storage Tank 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 [email protected] -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Bob Caputo via Sprinklerforum Sent: Friday, May 7, 2021 2:21 PM To: [email protected] Cc: Bob Caputo <[email protected]> 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 < [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. 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