2000@65 might set a record for jockey pumps. And that is if the two jockey pumps that Tom referenced are present failed.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Mar 7, 2014, at 3:11 PM, ampeck <[email protected]> wrote: > > With working overseas I've seen some projects with 2 pumps. One big and one > small. I asked about this and I got a straight face answer. > > "well if one sprinkler heads goes off we don't want the big fire pump turning > on. Only if there's a high demand. The smaller pump handles small fires and > the large pump handles large fires." > > When I brought up that well why do you care? I got a shoulder shrug and look > of why would I not want 2 pumps? > > I summed it up that the smaller pump was used as a larger jockey pump. They > didn't want the main pump to come on unless it was absolutely necessary. I > think it might have been some kind of a reason or concern over to much > pressure on the system if the large fire pump turned on. But still it > wouldn't have exceed 175psi with the larger pump. > > >> On Mar 8, 2014, at 2:33 AM, Charles Thurston <[email protected]> wrote: >> >> Hello Todd, >> >> There might have been an office area in there at one time the smaller pump >> was for. No telling from here :) Good Luck and please let us know what you >> end up doing. >> >> Friday, March 7, 2014, 2:23:27 PM, you wrote: >> >>> 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 >> >> >> >> -- >> Best regards, >> Charles Thurston mailto:[email protected] >> Systems Design Manager >> NICET Certified >> >> _______________________________________________ >> 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
