I think I’ve preached this before but to my way of think standpipes and hydrants are the drivers of design when present with sprinklers acting as a first line of containment, buying time for manual suppression. That they work so well at suppression so often is an added bonus.
On Thu, Jul 29, 2021 at 12:03 PM cw bamford via Sprinklerforum < [email protected]> wrote: > I looked at this Question a few times and finally saw - > "....3 hydrants it serves....." > > my initial thought was 750 gpm pump x 1.5 = 1125 gpm Max. design > that's a big for an apartment and 13R > > 1125 gpm 60 minute supply 67,500 gallons or double that for 120 minutes > > Was pump designed for hydrants? Does it need a Tank? > Standpipe Design? > > could a "New Controller" that Limits PSI be installed ? > > > On Tue, Jul 27, 2021 at 4:28 AM Tom Duross via Sprinklerforum < > [email protected]> wrote: > > > Good morning Campers. Looking for advice and comments. > > > > I have an existing diesel driven fire pump in a prefabricated pump house > > installed in 2012 serving 2 apartment buildings. > > > > I first tested this pump in 2017, had 13 hours on it, ran fine but we ran > > out of water at just about 100% capacity. > > > > Spent the day with the water department a few days later checking > > underground valves, flowing a few street main’s hydrants, basically came > to > > the conclusion that this is all we got. Wrote up a report, suggested > they > > hire an FPE to see if the pump’s tested capacity meets requirements, how > > did > > this happen, what about the hydrants off this system, stuff like that. I > > think I stirred the sleepy caldron a little. > > > > Didn’t hear back from the client until this spring. Apparently they > > changed > > ITM contractors and the new one didn’t pan out. They had a balcony fire > > May > > 2021, gas grille, 13R system with no attic protection, non-completed > attic > > separations and fire walls, etc. Fortunately they had a response so > > quickly > > it never made it to penetrate the eaves and soffits and was extinguished > > between the 5th and 6th (top) floors. Local FD must have had a field day > > with a Q20 of about 800 and closest city hydrant ¼ mile away. Waiting > for > > incident report to review. > > > > > > > > So back to my query. It’s a xy&em pump house. All welded sch40 and > > painted. Not the greatest build as there’s a 6” BFP vertically installed > > right off the incoming service with elbows turning it around and down to > > the > > floor to feed the pump. Just a few spacers in the piping so no room for > > slipping in this device unless something gets removed or moved. 4-15 of > > #20 > > (2013) says between the pump discharge and check and I get that but also > > defers to the mfgr. for direction. Looking at the various offerings most > > are a little vague on placement and even one says after the pump > discharge > > valve. Without major surgery, I have 2 spots to slip in this 20” long > > device. I can remove the relief valve between the discharge increaser > and > > pump check and put it there ‘or’ I can remove the tee feeding a 6” storz > > and > > check located between the discharge valve and the city bypass. The > former > > will allow me to test through the device but the latter will not. I > don’t > > believe either of these appurtenances are necessary and I will explain > > (he’s > > still rambling? Jeepers….). The engine is a small JD inline 4 running > > 3000 > > rpm, single ECM, max. speed is 3300. Churn is 155 at 3025. I haven’t > > physically done it but if I extrapolate to 3300 I get 170 psi. I’m below > > 175 so I think the PRV can go. If I opt to remove the storz I can but > > testing this pump will have to be via the 3 hydrants it serves, in > addition > > to the 2 buildings. I honestly don’t know why the engineer (small E) > had a > > storz included as this house it atop a hill in the woods ½ mile away > from a > > city hydrant and these buildings. > > > > > > > > OK, done rambling. Loose the PRV or keep scratching my head? > > > > > > > > Let’s go Red Sox! > > > > > > > > Tom Duross > > > > _______________________________________________ > > 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 > -- Sent from Gmail Mobile _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
