Could you just replace the motors with a higher HP rated motor? Mark at Aero
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Todd - Work Sent: Wednesday, November 12, 2014 2:48 PM To: [email protected] Subject: Re: pump replacement issue I don't think that is the case because the cisterns had been investigated with an underwater ROV before the decision was made to replace the pumps. That showed them relatively free of debris. (The screen was actually missing on one of the existing pumps.) In an extreme case, wouldn't that obstruction cause cavitation? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Nov 12, 2014, at 3:32 PM, Art Tiroly <[email protected]> wrote: > > There is a basket shaped screen at the base of the shaft to protect > the pump impellers. > If that screen is clogged or obstructed the waterflow is greatly reduced. > We had a VT pump screen enclosed by plastic sheet in the cistern. > > > Art Tiroly > ATCO Fire Protection/Tiroly > 24400 Highland Rd CLE 44143 > 216-621-8899 > 216-570-7030 cell > > > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] > On Behalf Of Todd Williams > Sent: Wednesday, November 12, 2014 3:06 PM > To: [email protected] > Subject: Re: pump replacement issue > > VT pump in cistern > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860-535-2080 > www.fpdc.com > > >>> On Nov 12, 2014, at 2:45 PM, <[email protected]> >>> <[email protected]> >> wrote: >> >> 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 th > _______________________________________________ > 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
