Matt, There is some temperature difference of about 6-8 degree celsius only. Pump is in service from only 2-3 weeks. pressure switch? Worth a check..
Craig Supply is from water tanks. There is a check valve provided in the pump discharge. We have water storage in 3 tanks with a common supply to pump. As for yesterday pressure drop was from 20 bar to 15 bar .. On Mon, May 3, 2010 at 11:37 PM, Matt Grise <[email protected]> wrote: > What is the change in temperature from day to night? Is the piping exposed > to outdoor temperatures? Sunlight? > > Is it possible that there are small leaks in the standpipe that could drop > the pressure? > > How long have you had the pump in service? > > If this just started happening, maybe there is a problem with the pressure > switch? > > Matt Grisé PE*, LEED AP > Sales Engineer > Alliance Fire Protection > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of sam b > Sent: Monday, May 03, 2010 2:30 PM > To: [email protected] > Subject: Re: Fire Pump > > craig > > Surely that can be done.(adjust the differential) > But am worried what is goin wrong? > > > > On Mon, May 3, 2010 at 11:23 PM, <[email protected]> wrote: > > > Tom, look at your conversion factor again. Bar X 14.5 = psi. > > > > Pump rating is 20 bar (290 psi), set point to start is 16 bar (232 psi). > > > > You're saying there is a system pressure differential of 4 bar (58 psi) > > between normal daytime pressure and night time pressures? > > > > Apparently you don't have a jockey pump on the system to maintain the > > pressure? > > > > Any reason not to adjust the differential a bit wider, say drop the start > > point to 14 bar maybe? > > > > Craig L. Prahl, CET > > Fire Protection Specialist > > Mechanical Department > > CH2MHILL > > Lockwood Greene > > 1500 International Drive > > Spartanburg, SC 29304-0491 > > Direct - 864.599.4102 > > Fax - 864.599.8439 > > [email protected] > > http://www.ch2m.com > > > > > > -----Original Message----- > > From: [email protected] [mailto: > > [email protected]] On Behalf Of tom poisal > > Sent: Monday, May 03, 2010 3:18 PM > > To: [email protected] > > Subject: Re: Fire Pump > > > > On Mon, May 3, 2010 at 3:08 PM, sam b <[email protected]> wrote: > > > > > but do you expect this to go down so much ,more than 2 bars even,.? > > > am actually waiting for the status tonight...:) > > > > > > Yeah your talking 2 bars = only .1378 psi, I have seen systems lose 5-6 > > psi > > > overnight and gain it when the sun rises > > > > > > On Mon, May 3, 2010 at 11:02 PM, tom poisal <[email protected]> > wrote: > > > > > > > sam, it is the temp rise/loss; when it gets to night time the water > > > cools > > > > and lowers the temp which lowers the psi/bar same with an overnight > > hydro > > > > test..not much you can do about it that i know. > > > > > > > > > > > > On Mon, May 3, 2010 at 2:57 PM, sam b <[email protected]> wrote: > > > > > > > > > Hii everyone > > > > > > > > > > > > > > > My previos mail in this forum was regarding a temporary fire > > pump(only > > > > > dieselPump) only. > > > > > we have installed this fire pump for temporary fire fighting in > the > > > > site. > > > > > The pump is 500 USGpm @ 20 Bar.(NOn Listed).The risers we have > > > installed > > > > up > > > > > to 7 floors now. > > > > > The pressure switch setting is kept such that when presuure drops > > below > > > > 16 > > > > > Bar the pump automatically starts. > > > > > For the last 2 days we are seeing that the pump starts > automatically > > at > > > > > night time.In the daytime there is no considerable pressure loss > > also. > > > > > our initial assesment was that it may due to air trapped inside ,as > a > > > > > result > > > > > we installed air release valve in both risers .Also the NRV in the > > > > > pumpdiischarge was replaced to ensure there is no leakage. > > > > > > > > > > Any guesses on whtmay b the reason? 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