Why are you wanting to install the suction control valve? Was it requested by the FD or water supplier?
I would be concerned about removing the PRV without knowing all about what is downstream. It would be just your luck that some contractor got a variance to build the mains out of pool-noodles that burst at 110psi... Matt -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Tom Duross via Sprinklerforum Sent: Tuesday, July 27, 2021 6:28 AM To: [email protected] Cc: Tom Duross <[email protected]> Subject: FP Suction Control Valve 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] https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.firesprinkler.org%2flistinfo.cgi%2fsprinklerforum-firesprinkler.org&c=E,1,mmPokZ5kJYxxqn-qLWYOa8oByvhphYn0IWPvP-rwhJfnI61REB-9wquqpynEEdKJl0X271lXhFcIkVejTI97f_-715aBoh48om2v3jREiFtX-eV7C0mR3iGd&typo=1 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
