Bob, Based on the information you provided, if it were me, I would include the 2100 feet of underground piping and fittings in the calcs and make the actual fire pump location your source node. Since pressure loss is exponentially related to flow rate, your scenario would likely be OK for anything less than an actual demand of 800 GPM, but could be severely lacking if your actual flow demand ends up higher than the 800 GPM you selected. There is more information required to make a complete recommendation, but hopefully this is helpful.
It should also be mentioned that based on the information you provided, the pressure that is in the underground piping under normal conditions when the jockey pump is on could be greater than 175 psi (use the jockey off pressure + pressure increase due to elevation). This may require special considerations for your pipe/fitting/equipment selection to handle the higher pressures. Thanks, Skyler Bilbo 1700 S. Raney Street Effingham, IL 62401 217-819-6404 Direct [email protected] www.wenteplumbing.com On Mon, May 6, 2024 at 3:57 PM Bob Knight <[email protected]> wrote: > I have a project where the complete underground plan has not been > provided, yet. > What I do have is a fire pump house with a recent fire pump test. > The fire pump house is about 2,100 feet from the project site. It is > elevated about 54 feet higher as well. > I do have the underground loop around the building, so I was going to use > the connection point at the loop for the underground from the pump house as > the source point. > The pump test shows 152 psi @ 0 gpm and 101 psi @ 1500 gpm. > The elevation gain in pressure is 23.38 psi. > The friction loss through the 2,100 feet of pipe and 16 or so fittings and > valves, totals 2,372 feet. > This came out to 21.24 psi of friction loss, assuming 800 gpm of flow > including 250 gpm hose. > I'm adding the elevation gain and subtracting the friction loss from the > pump test. > This leaves me with 154.14 psi @ 0 gpm and 103.14 psi @ 1500 gpm. > I'm just going to use the numbers from the pump test and re-verify > everything at a future date. > Does this sound reasonable? > > -- > > > *Thank you, Bob Knight, CET III* > *Fire by Knight, LLC* > *208-318-3057* > [image: FIREBYKNIGHT] > > > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > Virus-free.www.avg.com > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > <#m_-7753638142420371045_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
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