Has the water supply to the pump been tested and deemed sufficient and meeting the original design criteria?
Craig L. Prahl Fire Protection Group Lead CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29303 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Todd - Work Sent: Wednesday, November 12, 2014 2:43 PM To: [email protected] Subject: Re: pump replacement issue The manufacturer's literature states that this pump requires a minimum of 22.1 hp to meet the demand. I have no idea what the actual output of the pump is but the plate says 30 hp. Not sure if torque would play into this at all. My contract was only to witness the pump test and write a letter regarding it. Determining if it provided sufficient water for the sprinklers was not a part of it. At the beginning of this project, I submitted a proposal through the contractor to analyze the sprinkler systems (two separate schools) and make sure the new pumps met the criteria, but that was turned down as not needed. I have some issues with the system in at least one school, but that is well documented. The test was done using 2 Hosemonsters with 1-3/4" inserts. When the straight 2-1/2" HM's were used, the pressure dropped to 4 psi, which is below the minimum HM recommends. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Nov 12, 2014, at 8:23 AM, Matt Grise <[email protected]> wrote: > > It is still early for me - so I cannot guarantee 100% brain power behind > this... > > I would say that the HP deficit could definitely cause your flow > shortage. The work that the motor puts in results in water flow and > water pressure. You can get more flow OR more pressure for the same > HP, but if you want more of both it takes more power. (for a fun time, > read that sentence with Mr Scotty's voice when captain Kirk asks for > warp 7) > > Also - lots of pump literature will also include a horsepower demand curve > under the pressure/flow curve. If it is there, you might line up 30 hp > against the flow curve and see where you end up. > > Matt Grisé PE*, LEED AP, NICET II > Sales Engineer > Alliance Fire Protection > 130 w 9th Ave. > North Kansas City, MO 64116 > > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] On Behalf Of > Tim Stone > Sent: Wednesday, November 12, 2014 7:16 AM > To: [email protected] > Subject: RE: pump replacement issue > > Todd, > Does the pump meet the sprinkler demand? > I would contact the manufacturer and discuss with the test department. > > 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 > [email protected] > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] > On Behalf Of Todd - Work > Sent: Wednesday, November 12, 2014 7:49 AM > To: [email protected] > Subject: pump replacement issue > > I was asked to witness a pump test on an installation where a new 500 > gpm at > 54 psi VT fire pump had been installed on an existing diesel driver. The > churn and rated flow curves were OK, but we could only get a maximum of 650 > gpm out of the pump (at a pressure consistent with the expected curve). Any > thoughts as to why this would happen? > > The thing I noticed in the pump literature is that the "test motor" > was rated at 50 hp and the site motor is 30 hp. Both of these were > indicated on the literature. Could the difference in horsepower (even > though RPM was the > same) be the reason? > > The pump is a Xylem-AC > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > www.fpdc.com > 860-535-2080 (ofc) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.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
