Paul, I have been thinking more about this and re-reading the excellent responses and learning. I think it is important to get an accurate sketch before you finalize the calculations. I would want to meet with the water department and draw the picture the numbers and your current understanding show for Hydrant #2: If the source for #2 is a storage tank its elevation would be 128/.433= ~296 feet above the hydrant. It would also be about 10 miles away because flowing 265 through 6" UG (minimum if serving hydrants) it would take about 60,000 feet of pipe and fittings to burn 120 PSI. This is not impossible but it is strange that after all that the FD is left with 8 psi at 265 GPM to try to do something with, when 376 feet over and 50 feet down is hydrant #1 with 40 @ 750!
thanks and good luck, Brad -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Friday, February 20, 2015 10:02 AM To: [email protected] Subject: RE: Hydraulic Calculations with two water sources Thanks Paul. The first thing I noticed yesterday was that the static difference between #1 and #2 did not correspond to the elevation difference. And 120 PSI worth of Pf+Pv from the source to the hydrant is 5-6 times more than one would expect if it is serving hydrants. I can see 128,108,265. Is there any way something might have been jotted down wrong when the information was communicated? Brad -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Paul Cetani Sent: Friday, February 20, 2015 9:12 AM To: [email protected] Subject: RE: Hydraulic Calculations with two water sources Hey Brad, This test was conducted by the water company and doesn't really sound right to us either but, because of the water situation in California, they will not perform a new test. Paul B. Cetani Exec. Vice President Nor Cal Fire, Inc. 16840 Joleen Way, Bldg A Morgan Hill, CA 95037 T 408-776-1580 F 408-776-1590 [email protected] www.norcalfire.com CONFIDENTIALITY NOTICE: This message and any document accompanying it may contain confidential information belonging to the sender. The information is intended only for the use of individual or entity named above. If you are not the intended recipient, or the employee or agent responsible to deliver this message to the intended recipient, you are hereby notified that any disclosure, copying or taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this transmission in error, please immediately notify us by telephone to arrange for return of the documents. -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Friday, February 20, 2015 6:08 AM To: [email protected] Subject: RE: Hydraulic Calculations with two water sources Paul, I am curious about the hydrant #2 flow test: "The closest hydrant from this water source (hydrant #2) is 50 feet higher in elevation than hydrant #1. Hydrant #2 has a static of 128psi, residual of 8psi, and a flow of 265gpm." If you have time will you post any additional details you know about it please? thanks, Brad _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
