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 -------- Original message -------- From: Brad Casterline <[email protected]> Date:03/06/2014 8:14 PM (GMT-06:00) To: [email protected] Subject: Re: Pump House Controls Correction on pump #3? Should be 2500 @ 65, not 2000 @ 65? > On Mar 6, 2014, at 6:54 PM, "Tom Duross" <[email protected]> wrote: > > I have a question regarding how you guys would control this. > > Outside pump house with aboveground tank, 500,000 gal. > Three diesel drive fire pumps in parallel from 10" tank supply to 10" yard > supply. > All three pumps are rated at 2500 GPM but different pressure ratings. > I have no design information right now but it's a record storage facility, > 50' high piles of paper, fwiw. > I'm looking at replacing one of the pumps, the oldest and original, I'll > call it pump #1. > Pump #1, original 1971 is a 10x8 rated for 2500@125 PSI. > Pump #2 was replaced in 2003, same model 10x8, nice tier 2, 2500@125. > Check. > Pump #3 was replaced in 1994, same model 10x8, but 2000@65. Huh? > Jockeys are dual vertical turbine, 100@140. Check. > If I work under the premise of direct replacement and quote a 2500@125, tier > 3 or 4, > how would you guys balance these pumps for lead to lag with a pump so small > compared to the rest? > Pump #2 becomes the lead pump and #1 and #3 fall in 10# each behind? > TD > > > _______________________________________________ > 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
