Determining fire flow?
Determining fire flow?
(OP)
Just came across this forum, hope to be able to interact and contribute in the future. For now I have a basic question. I am working on a plan to extend 400 lf of 6" pvc line into a subdivision. The line will then tee with 2" lines perpendicular to the 6" going 400 lf in each direction, maybe 5 residential services each. There will be a fire hydrant placed off the 6" line near the 2" intersection. The 6" will tie into an existing 8" line via cut in tee.
Knowing the static pressure the water system maintains (60 psi), is it possible to calculate fire flow and pressure at the proposed hydrant and water services? Can this only be done with modeling software?
Thanks
Knowing the static pressure the water system maintains (60 psi), is it possible to calculate fire flow and pressure at the proposed hydrant and water services? Can this only be done with modeling software?
Thanks





RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
P1=40 psi, P2 =20 psi, used C=140. Trial & error to get 1256 lf 8" pipe results in 1570 gpm.
Added 800 feet to pipe length, solved for discharge (P2=20 psi), Q=1203 GPM
RE: Determining fire flow?
RE: Determining fire flow?
RE: Determining fire flow?
But you can use an on-line calculator as well, just takes a little more trial and error to solve for pressure drop.
http:
RE: Determining fire flow?
static 81 psi
1" 80 psi 112 gpm
1.25" 79 psi 223 gpm
1.5" 77 psi 322 gpm
2" 69.5 psi 664 gpm
2.5" 57.5 psi 1115 gpm
4.5" 18 psi 1680 gpm
Fire hydrant will be on 6" pvc line at 300' from 8" tie in then branch 2" each way.
Need to estimate fire flow and customer flow. 8 customers each on 2" lines.