I’ve got a 10+2 Sty building that needs a new pump for a myriad of reasons. Replacement will be larger to satisfy Standpipe demand. New system pressures will require PRV’s to the 10th flr. and maybe one or both levels of mechanical above. None currently installed, 190 PSI in the pump room. 2 Standpipe design with duel fed checked-off systems on every floor. I’m trying to convince Owner monetarily that removing the old FDV and installing it downstream of the PRV in each stairway will save a PRFDV and help with 5-year PRV testing. Each system on each floor will feed that floor’s sprinklers and 2 FDV’s through a new PRV on each standpipe. There are smoke vestibules outside each stairway because stairs are scissor style and back up to each other. Standpipes are only 20’ apart. Plugging the FDV outlets and relocating the FDV’s will allow the FDV’s to be located in the smoke vestibules instead of the stairways which I believe is required. This, I believe is a design reason for relocating the FDV supply. Another thing I’m trying to convince Owner is to install zone check’s around the new or reused FCV’s to help save water (not billed for yet but coming) and lower his ITM costs (we’ve been testing this building for 10 years). Also, about 50% of the main piping has been replaced over the years due to pinhole leaks and corrosion found during internal inspection or just plain leaks. Nothing in the standpipes or sprinkler piping has been found effected so far, just the feed mains and within the pump room. Circulators will help this I believe by hastening the infusion of fresh oxygen via testing water consumed.
I’ve also got the cost of upgrading the DR’s from 2” to 3” with inlets on every level (we do enough of this that every other is a pita, especially scissor stairs), un-combining them and finding termination points that will accept the anticipated discharge (gotta use 500), running 120 VAC risers for the pumps with key switches, and factoring in the additional 5-year PRV testing into their yearly ITM budget. My main question is about the valving off the standpipes. If I show a valve off the standpipe to the PRV and out of the PRV a tee branching down and over to the reused non-reg FDV, do I really need another valve before the new/reused FCV supplying the sprinklers? If I can save this valve, between the cost of the valve and another FA module, and additional ITM costs, I can offset the cost of the zone check substantially. I plan on using a pilot operated PRV so no additional tamper. Each PRV will only supply sprinklers and 2 FDV’s. I’ve been a fan of this style of zoning since I first came across it 10+ years ago but those guys always installed a second valve for sprinklers only. >From what I foresee, the downside of omitting this second valve means when the >floor is shutdown, so is the FDV times 2. I can’t see where anything says >this can’t happen unless I’m missing something. I don’t mean to state if the >code doesn’t say no does that mean yes. Thanks in advance. Thomas Duross The Fire Pump Testing Company 11 Varney Street Jamaica Plain, MA 02130 T 617-971-0700 F 617-524-7171 C 617-592-4236 <mailto:t...@thefirepumptestingcompany.com> t...@thefirepumptestingcompany.com <https://vimeo.com/user17960212> https://vimeo.com/user17960212
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