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 Nov 19, 2024 at 10:03 AM, <Jeff Brickell (mailto:[email protected])> > wrote: > > > > > > A couple of points here: > > > > > > > > 1. You do not say where the demand points are located. I have to make > assumptions that the garage is probably at the dry valve or whatever system > control. Is the 7th floor demand taken at the floor control on the 7th floor? > What is the actual demand at the BoR or location close the garage connection? > Correct, the garage is served by a dry valve in the fire pump room. The > demands are at B.O.R. The 7th floor is a combination standpipe and the > demand is at the B.O.R. of the standpipe riser in the fire pump room on level > 1. The actual demand is 385 GPM plus the 250 Hose Demand. > > > > > > > > So based on this and your first email, your 7th floor sprinkler demand, with > hose stream, is 635 gpm at 66 psi at the manifold on the 1st floor. This > cannot be provided by the public water. However, the 1st floor garage demand > is 635 gpm at 61 psi at the manifold, which the city demand can provide. > Wouldn’t it be easier and cheaper to modify the 7th floor sprinklers so that > the demand can be met by the city? > > > > > > > > > > > > > > > > > > > > > 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 Nov 19, 2024 at 9:06 AM, <Jeff Brickell (mailto:[email protected])> > > wrote: > > > > > > > > > > > > I have a situation that’s unique to me and am looking for some guidance. > > > > > > > > > > > > > > > > I have a 7-story building. The first level contains a parking garage > > with a demand of 635 GPM @ 61 PSI. The municipal supply can meet this > > demand. > > > > > > > > > > > > > > > > The 7th floor has a remote area with a demand of 285 GPM @ 66 PSI, which > > the municipal supply cannot meet. > > > > > > > > > > > > > > > > NFPA 20 says to size a fire pump to meet the greatest demand. If I can > > meet the level 1 demand without a pump, why would I need to size a fire > > pump for it? There would be a drastic size reduction if I only had to > > meet the 7th floor demand. > > > > > > > > > > > > > > > > I have reached out to a couple other people, and they have all said I need > > to size the pump to the garage demand, I am just curious as to why. > > > > > > > > > > > > > > > > If the contractor were to tee the underground and bring up a second supply > > for the first floor only would that be acceptable to then not use a pump? > > Maybe there is something I’m not considering or thinking of since this is > > new to me. > > > > > > > > > > > > > > > > Any advice, comments welcome, thank you. > > > > > > > > > > > > > > > > > > > > > > > > Jeff Brickell, CET > > > > > > > > Senior Estimator/Designer > > > > > > > > NICET III CERTIFIED > > > > > > > > CERT #147245 > > > > > > > > > > > > > > > > OREGON CERTIFIED COBID FIRM #13272 > > > > > > > > (EMERGING SMALL BUSINESS) > > > > > > > > > > > > > > > > TRIAD FIRE PROTECTION > > > > > > > > > > > > > > > > OREGON . WASHINGTON . ARIZONA > > > > > > > > > > > > > > > > OFFICE 503.856.6333 > > > > > > > > CELL 602.550.4292 > > > > > > > > FAX 866.766.8862 > > > > > > > > > > > > > > > > _________________________________________________________ SprinklerForum > > mailing list: > > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > > To unsubscribe send an email to > > [email protected] > > (mailto:[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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