Reverse calculation to determine GPM, PSI?
Reverse calculation to determine GPM, PSI?
(OP)
Fluid Mechanics is not my field, but I have been asked to assertain what the correct GPM/PSI would be to effectively "flush" steel tubes out with a diameter of 1" and a length up to 60'. We do have an existing hose system, but I get the impression that it wasnt calculated in the first place. Specs for existing pump are 15 hp at 3450 rpm, pump curve is 84 gpm at 145psi. Seems like overkill to me but ive been wrong before, and hence that is why im here.





RE: Reverse calculation to determine GPM, PSI?
David
RE: Reverse calculation to determine GPM, PSI?
TTFN
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RE: Reverse calculation to determine GPM, PSI?
RE: Reverse calculation to determine GPM, PSI?
TTFN
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RE: Reverse calculation to determine GPM, PSI?
RE: Reverse calculation to determine GPM, PSI?
Where do you expect the water and particles to go?
Instead of sealing it, could I suggest a drain to a sump or other reservoir?
The relationship between gpm and velocity and pressure are pretty easily derived based on the units. Just remember that the psi is pounds-force and the density is pounds-mass and throw in the gravitational constant.
Your 84 gpm in a single 1" tube is around 33 ft/sec velocity. That should sweep out everything, providing its got somewhere to go. Just don't do it too long, or you'll start eroding your pipes.
Patricia Lougheed
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RE: Reverse calculation to determine GPM, PSI?
You might need to provide some aeration in the water to move the lime particles along.
TTFN
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RE: Reverse calculation to determine GPM, PSI?
RE: Reverse calculation to determine GPM, PSI?
Try running some samples at different flows. My guess is that someone determined empirically that the current flow was required to do the job to whatever level of acceptance there is or was. No one would seriously accept 84 gpm loss over any long period of time jsut because they're lazy, since that does represent, literally, money down the drain.
TTFN
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RE: Reverse calculation to determine GPM, PSI?
RE: Reverse calculation to determine GPM, PSI?
RE: Reverse calculation to determine GPM, PSI?
Just how free of particulates is it supposed to be?
And while the particulates might not be grossly sticky, they may be Van der Waals sticky, hence the large flow rates.
TTFN
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RE: Reverse calculation to determine GPM, PSI?
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RE: Reverse calculation to determine GPM, PSI?