Agree, no way 10" is supplying all three pumps at the same time. John
John August Denhardt, P.E., FSFPE Strickland Fire Protection Incorporated 5113 Berwyn Road College Park, Maryland 20740 Office Telephone Number: 301-474-1136 Mobile Telephone Number: 301-343-1457 FIRE SPRINKLERS SAVE LIVES - Can you live without them? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, March 07, 2014 9:30 AM To: [email protected] Subject: RE: Pump House Controls There's a lot of information missing. I saw a similar setup where the low pressure pump had originally been selected due to being connected to the municipal water supply. Later, new pumps were added to a new water storage tank but had a much higher pressure rating since they were not supplied from the city service. In this scenario, there are many possibilities. You could have a primary and backup pump setup drawing from the tank, and the lower pressure pump connected to municipal as backup if the tank is depleted. Owing to the fact that the UG supply is only 10" I'd say you're not looking at all three pumps being active at one time, maybe two? Also don't forget that 2500 gpm pump is capable of 3750 gpm output. Lots and lots of guesses. This is why when seeking advice or input it is critical for forum members to have as much information as possible. We all like problem solving but having more information keeps the guesses to a minimum and allows for more valuable information to be shared. Craig L. Prahl, CET 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: [email protected] [mailto:[email protected]] On Behalf Of Bill Brooks Sent: Friday, March 07, 2014 8:53 AM To: [email protected] Subject: RE: Pump House Controls What do you have to say about a triple pump arrangement with 7500 gpm total capacity being fed by a 10" supply? Wouldn't this mean the system was designed for 2500 gpm demand? Maybe I'm missing some other information about the existing set-up. Bill Brooks -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tom Duross Sent: Thursday, March 06, 2014 7:55 PM To: [email protected] Subject: Pump House Controls 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
