RPM was running in the expected 1770 range. Diesel drive Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc)
> On Nov 12, 2014, at 5:18 PM, Art Tiroly <[email protected]> wrote: > > Did you check the RPM at full load? Was it up to speed? How about Volts and > Amps? All normal? > > Art > ATCO Fire > > -----Original Message----- > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Todd - Work > Sent: Wednesday, November 12, 2014 4:48 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
