“Neither pump has ever passed its initial test due to the water supply”. So, the water supply can’t even provide 600 GPM to the little pump? If that’s the case, there is no workaround other than adding a water tank. You can commission the pump without reaching 150% of the rated capacity, but you have to at least meet the demand flow and pressure. If you can’t get to 600 GPM, you certainly aren’t getting to 825 GPM.
-Kyle M at Aero From: Fpdcdesign <[email protected]> Sent: Monday, October 6, 2025 7:24 AM To: Sprinklerforum <[email protected]> Subject: [External][Sprinklerforum] Multiple undersized pumps. 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<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell)
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