I have no idea what the purpose of the smaller pump is. The 2500@125 pump would (in theory) produce 3750 gpm at 81 psi. The churn pressure for the 2000@65 pump is 78 psi. The smaller pump is not going to have any impact on the available water until the pressure falls below 78 psi, which would probably be somewhere around 4000 gpm (assuming the actual flow will exceed the 150% point). If all 3 pumps are flowing, that number goes up to 8000 gpm. At 8000 gpm, 500000 gallons will last 62.5 minutes. If you have a fire that is demanding 8000 gpm, it is probably time to get out the marshmallows and call CNN.
I know there were some funky things that went on with the old IRI Maximum Reliability Systems. Could this have possible been one of those? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) Begin forwarded message: > From: Todd - Work <[email protected]> > Date: February 25, 2014 at 4:42:15 PM EST > To: Barbara Corbeil <[email protected]> > Subject: Video by uconnwbb Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Mar 7, 2014, at 7:57 AM, "Tom Duross" <[email protected]> wrote: > > I emailed and received order info on the remaining original pump. I emailed > the factory back and asked if three were ordered at once and what the sizes > were. > I have no idea what the demand is Todd, maybe I should refer you to take a > look on that end. I do know it was a refrigerated warehouse when the order > was placed in 1971. > I just boggles me that, assuming they were all the same, one replacement was > ordered so small. Two 2500@125 and one 2000@65. Not even 2000@125, > 2000@65. > Scott, my thinking (and it's just me) would be to progress from small to > large like with jockeys when in duplex/triplex fashion. > The automatic pressure controls will be difficult either way so maybe sync > the baby for lag 2 seeing yard pressures will probably be down 75-100 PSI at > that point. > I doesn't appear much has been done here in 10 years and it's an FM job > which is surprising. > I do have some thoughts about PLD and possibly a lower pressure on the > replacement for the remaining original but can't make a move until someone > smarter than me looks at what's on the other end of that 150 PSI yard main > and huge building full of paper. > I've also reached out to the local shop who replaced 2 of them but not > getting much response. > I'll keep the list updated. > TD > > I'll ask another question. How many and what size pumps are required to meet > the sprinkler demand? > > Todd G Williams, PE > >>> On Mar 6, 2014, at 10:08 PM, Brad Casterline <[email protected]> >> wrote: >> >> It occurs to me you are looking for answers not questions-- I'll run >> back up to the nosebleed section now and just spectate >> >>> On Mar 6, 2014, at 8:41 PM, Brad Casterline <[email protected]> > wrote: >>> >>> Shouldn't the order of operation be farthest from tank, middle, closest > to tank? Especially if farthest is weakest? >>> >>>> On Mar 6, 2014, at 8:30 PM, "J. Scott Mitchell, PE" > <[email protected]> wrote: >>>> >>>> 100% guess, but the first two may be intended to support the fire > sprinkler system in the building with the third one coming on late in a bad > game to support hose streams. >>>> >>>> Just a thought. >>>> >>>> J. Scott Mitchell, PE >>>> >>>> >>>> Sent from my Verizon Wireless 4G LTE smartphone > > > _______________________________________________ > 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
