Not a problem, Bob. That came from the “Learn from experience” department. Todd Williams
Fire Protection Design/Consulting Stonington, CT 860-608-4559 > > On May 6, 2024 at 8:38 PM, <Bob Knight (mailto:b...@firebyknight.com)> > wrote: > > > As a follow up to this, I ran the calcs both with an adjusted pressure and > by creating the fictitious underground. > The made up underground with the fire pump as the source created a lower > overall demand. > So, I'm more comfortable using the adjusted water pressure for the calcs. > When a final set of utility plans is made available the calcs will be > adjusted accordingly. At this point I like the idea of going with the more > stringent of the two ideas. > > I appreciate all the help, and thanks Todd for pointing out the obvious fact > that I missed about the static pressure. > > > > > Thank you, > Bob Knight, CET III > Fire by Knight, LLC > 208-318-3057 > > On 5/6/2024 3:18 PM, Fpdcdesign wrote: > > > > > There is no friction loss at 0 gpm. The static at the riser will be your > > churn pressure plus the elevation gain. > > > > > > In my opinion, you should include the mains as you describe them as part > > of the calculation. > > > > > > > > > > Todd Williams > > Fire Protection Design/Consulting > > > > Stonington, CT > > > > 860-608-4559 > > > > > > > > > > > > > > > > > > > > > > On May 6, 2024 at 4:57 PM, <Bob Knight (mailto:b...@firebyknight.com)> > > > 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 > > > > > > > > > > > > > > > > > > > > > > > > > > > Virus-free.www.avg.com > > > (http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient) > > > > > > > > > > > > > > > _________________________________________________________ SprinklerForum > > > mailing list: > > > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > > > To unsubscribe send an email to > > > sprinklerforum-le...@lists.firesprinkler.org > > > (mailto:sprinklerforum-le...@lists.firesprinkler.org) > > > > > > > > > > > > > > > _________________________________________________________ SprinklerForum > > mailing list: > > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > > To unsubscribe send an email to > > sprinklerforum-le...@lists.firesprinkler.org > > (mailto:sprinklerforum-le...@lists.firesprinkler.org) > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org >
_________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org
