Todd, 1. Is the existing 400-gpm pump supplied from an adequate city water supply?
2. Is the city supply good enough to supply a 750-gpm pump? 3. If yes to #2, then replace the 400-gpm pump with the 750-pump or larger to supply the underground main system. If no, then you’ll need a storage tank. 4. Not wanting to be a “tattle tail”, but you could contact the property insurance carrier to advise them of the deficiencies and ask them for recommendations. Just my thoughts. Rick > On Oct 6, 2025, at 9:24 AM, Fpdcdesign <[email protected]> wrote: > > > I am working on a project for a facility with several small and medium sized > buildings. Only some of the buildings are sprinklered. This location has a > plethora of problems but I only have one that i will bring here. > > The facility has a very bad water supply and a new building was constructed, > complete with fire pump, to meet a demand of 825 gpm. Also on this site is a > fire pump house with a 400 gpm at 75 psi pump that takes suction from the > main. I was told this pump only feeds a dedicated main to 3 buildings. > However, I subsequently found that the pump actually ties into the > underground feeding the entire site, including the new building. Now I have a > main fed by a pump with a maximum flow of 600 gpm feeding a 750 gpm pump. Is > there any way to get this to work? There is no by-pass around the 400 gpm > pump. Not sure if that would make a difference. I would appreciate input from > those mightier than I. > > Neither pump has ever passed its initial test due to the water supply. > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860-535-2080 (ofc) > 860-554-7054 (fax) > 860-608-4559 (cell) > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected]
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