Thanks again, I think that we are ok, I am very grateful to have you guys around.
Greg McGahan Operations Manager Living Water Fire Protection 1160 McKenzie Road P.O. Box 877 Cantonment, Florida 32533 (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, August 06, 2009 3:05 PM To: [email protected] Subject: RE: water storage tank FWIW: I was digging through some old project data where we had some flow information from a similar arrangement. The 250,000 gallon elevated tank, B.O.T. was 140ft, with a 10" riser serving a 10" underground fire main. Residual flow at the hydrant nearest the tank revealed approximately 2100 gpm at 65 psi. Loss through the 10" riser using HW would indicate about a 1.7 psi loss for the 140 ft. And BTW, the risers are usually steel not DI. So different C-factor, makes a little difference in the loss. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mark Sornsin Sent: Thursday, August 06, 2009 3:36 PM To: '[email protected]' Subject: RE: water storage tank The correct calculation is 0.156 x 14 not 140 (the formula given earlier was 0.156 psi/10 ft.). So your loss through 140 ft. of cement lined ductile iron would be 2.2 psi at 1,560 gpm. [that loss per foot of DI pipe seems a little high to me, but its prolly good enough for these purposes] Mark A. Sornsin, PE Fire Protection Engineer Ulteig Engineers, Inc. Fargo, ND Direct: 701. 280.8591 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Thursday, August 06, 2009 1:37 PM To: [email protected] Subject: RE: water storage tank You are correct....the answer I got was "we don't know"........from the horse's mouth. Thanks for all of your help, I will let you know how it works out in a few hours. Greg McGahan Operations Manager Living Water Fire Protection 1160 McKenzie Road P.O. Box 877 Cantonment, Florida 32533 (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Thursday, August 06, 2009 11:04 AM To: [email protected] Subject: RE: water storage tank Someone designed a water tank and they can't tell you the output? Who sold that design contract? At 11:18 AM 8/6/2009, you wrote: >I am getting info piecemeal from the engineering firm that is in charge >of the tower. They say they don't Know what the residual pressure and >flow will be when the tower is completed. We have a sprinkler system >going in "next door" to the tower using the existing water from the old >system. However, they have installed a 4" pipe with a hydrant instead >of 6" (many years ago)and nobody knew until we dug it up. > >Now we are flowing 600 gpm through a 4" pipe to our source and the >calcs are too close for comfort. We are looking for a "guesstimate" >of the available water at the base of the tower without any fittings or >valves. I can add them in the 8" line from the base to the new tie in >point where the systems tie together. We are talking about needing to >pick up 5 to 10 psi not 20 or 30, so as long as we are close we should >be good. > >This really should fall on the EOR, but as is often the case in this >region, if we want to finish the job on time, we have to get an answer >immediately. > >So I can say that I should reasonably be able to expect .156 x 140' >= 22 lbs of loss from the tank to the bottom w/o fittings....therefore >if we say we should reasonably expect 1,500 gpm at 35 psi? > _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
