Kyle, As I mentioned, there are several issues with this site I didn’t mention. One is approximately 1000 ft of 80 year old, severely tuberculated 8” main (estimate C=30) that feeds the site. The first thing is that this needs to be replaced. Once that is done, the 825 is very possible.
CW, I have all of that info. I have been working on this since 2021 and it just came back to life after a year away. 825 gpm is the sprinkler demand only. There is a raw water supply that would be used for hose streams. I hesitate to post many specifics of the project here as what is going on could result in litigation. 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) > > On Oct 6, 2025 at 11:26 AM, <Kyle.Montgomery > (mailto:[email protected])> wrote: > > > > > > “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) > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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