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-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
