Are you sure you have a fire pump rated at 400 gpm? Listed fire pumps come in 250, 500, 750 etc gpm. Not 400 gpm. That aside, perhaps adding a water storage tank will solve the problem?
Bob Caputo, CFPS *President* *American Fire Sprinkler Association* p: 214-349-5965 ext124 w: firesprinkler.org <https://www.facebook.com/firesprinkler.org/> <https://twitter.com/afsa/status/1039528345367732224> <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> <https://www.instagram.com/firesprinklerorg/> *Train a safer, more efficient workforce.* By enrolling your employees in the AFSA Apprenticeship Training Series for Sprinkler Fitters <https://www.firesprinkler.org/WWW/Education/Apprentice_Training/WWW/Education/Apprenticeship_Training.aspx?hkey=e88ef09e-d74c-407f-abcd-995aff866149>, you will reap the benefits of a qualified, professional installation crew. Well-trained employees will work smarter, increasing your company's productivity and, in turn, its profits. Learn more <https://www.firesprinkler.org/WWW/Education/Apprentice_Training/WWW/Education/Apprenticeship_Training.aspx?hkey=e88ef09e-d74c-407f-abcd-995aff866149> . On Mon, Oct 6, 2025 at 11:23 AM Fpdcdesign <[email protected]> wrote: > 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 (ofc) > 860-554-7054 (fax) > 860-608-4559 (cell) > > > On Oct 6, 2025 at 11:26 AM, <Kyle.Montgomery <[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 (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] > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
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