Flow rate calculation?
Flow rate calculation?
(OP)
If I have my static and residual flow pressures and I know my pipe sizes and equvelant pipe lengths for fittings, how do I solve for gpm? For example a 2" main drain test with 75 psi static and 65 psi residual; with 10' of sch 40 steel c factor 120, (2) 90s and (1) angle valve. Can I use a variation of the Hazen Williams formula to do this? I have it attached wher I solve for pressure loss. Can I change this around and if so how?





RE: Flow rate calculation?
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Fire Sprinklers Save Firefighters' Lives Too!
RE: Flow rate calculation?
RE: Flow rate calculation?
Good luck!
Travis Mack
MFP Design, LLC
RE: Flow rate calculation?
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Fire Sprinklers Save Firefighters' Lives Too!
RE: Flow rate calculation?
Draining down the system could more than double the amount of time required to test the DCVA, hence my interest in a mathematical solution. I would simply pitot the main drain (for light, OH1 and OH2) but 99% of the time (my guestimate) one would not have a piping arrangement that will give a good laminar flow.
Thanks LCREP
I had thought of this and wondered how accurate they were. Pretty expensive, but it would pay for itself eventually. Would you have a little more information on the make and model you used, if you recall, and your experiences with it?
Regards all
RE: Flow rate calculation?
Regards
RE: Flow rate calculation?
It was 5-7 years ago and do recall all the details, just the flows. I know we have still have the meter in the Training Center, next time I am at the center, I will get the name of the unit.
Tom
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Fire Sprinklers Save Firefighters' Lives Too!
RE: Flow rate calculation?
not an engineer that drives a train is there some reason that table 5-2A out of the fire protection handbook 7th edition cannot be used????
RE: Flow rate calculation?
RE: Flow rate calculation?
I have been trying to get a company to give me the hydraulic clacs to prove one system they are installing, to see if they can use the two inch drain.
RE: Flow rate calculation?
I have to admit that your reference to train engineers slips by me... sprinkler engineers are like train engineers: not much going on? (don't want to start a war here though! :) )
Thanks for your replies cdafd.
RE: Flow rate calculation?