Tim, So based on 47 psi at one test valve and just a flow on the rest, what was the pressure on the suction flange of the pump? Can't you just plot 1500 gpm on flow test curve and subtract the friction and elevation losses between the supply and pump?
Brian, Pitot the discharge for each outlet, adjust the valves to control the required gpm, record the total gpm, read the discharge gauge on the pump and subtract the pressure on the suction gauge from the pressure on the discharge gauge? I'm glad tomorrow is Friday. Ron F -----Original Message----- From: Tim Stone [mailto:tston...@comcast.net] Sent: Thursday, May 15, 2014 8:51 AM To: Ronl.Fletcher; Sprinklerforum@lists.firesprinkler.org Subject: RE: Test Header Calc Ron, In my case the EOR was worried about negative pressures on the suction flange before the sprinkler contractor ordered the pump. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 tston...@comcast.net -----Original Message----- From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of rfletc...@aerofire.com Sent: Thursday, May 15, 2014 11:43 AM To: Sprinklerforum@lists.firesprinkler.org Subject: RE: Test Header Calc Okay, what am I missing? There are gauges on the suction and discharge sides of the pump, right? Ron F -----Original Message----- From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Tim Stone Sent: Thursday, May 15, 2014 8:36 AM To: Sprinklerforum@lists.firesprinkler.org Subject: RE: Test Header Calc Brian, I just performed this on a warehouse project with a diesel fire pump taking suction from a municipal water supply. The EOR wanted to know the pressures on the Suction Flange of the pump. I started off with 375 GPM on each test header valve and assigned a pressure of 47 PSI to one of the valves with just a flow on the rest. Adjust the starting pressure for your needs. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 tston...@comcast.net -----Original Message----- From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Brian Harris Sent: Thursday, May 15, 2014 11:22 AM To: sprinklerforum@lists.firesprinkler.org Subject: Test Header Calc I'm running a theoretical calc on a pump test header to try and determine if the existing pump is running at or near its rating, there are (4) 2-1/2" hose valves flowing 375 gallons each. The question I have is what pressure would be plugged into the calc's for each valve? I have a test chart that shows me a 2-1/2" orifice flowing roughly 400 gpm will have a 5 pitot reading. I've searched for threads on converting pitot to a residual pressure and it doesn't seem there is any direct correlation. I've also seen post that say a pitot reading and the residual are pretty close at pressure under 40 psi. Any help would be greatly appreciated. Brian Harris, CET BVS Systems Inc. Sprinkler Division bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
