has an online calculator, but it requires you to guess the friction
losses, and also wants metric units. Remember to subtract
the 15PSI atmospheric from your 100PSI supply to get
an effective 85 PSI pressure drop.
Huh? If you have 100 psig (gauge pressure) in and 0 psig out, that is 100
psi differential, but only under static (no flow) conditions. Under
flowing conditions supply pressure will drop based on head loss of
undisclosed piping to that point and undisclosed equivalent length of
piping after that point. Basically insufficient data to even take a wild
David Efflandt - All spam ignored http://www.de-srv.com /
http://www.autox.chicago.il.us/ http://www.berniesfloral.net /
I don't know about the temp but at 80 psi in 3/4" L copper you'll have 30
gpm out of a 100' of it.
I used to have a better chart but the page doesn't work now.
You have too much pressure for water line, the velocity will be way too
high. Max velocity should be about 5-6 ft/s.
Quality Water Associates
Gary Slusser's Help Forum www.qualitywaterassociates/phpBB2/
What length is the pipe?
What pressure drop are you willing to encounter?
Assuming a 100 ft length of smooth (similar to electropolished) 3/4" L
copper tubing which will have an ID of 0.668 inches the flows look like
Flow Pressure Reynolds
rate Drop Number
19 gpm 95.38 psi 56,240
15 gpm 59.49 psi 44,400
10 gpm 26.48 psi 29,600
5 gpm 6.65 psi 14,800
0.75 gpm 0.15 psi 2,220
The last flow of 0.75 gpm is just about at the transition between
laminar and turbulent flow. (I like to use a Reynolds number of 2,300
as the transition.) For the higher flow rates, as turbulence increases
so will the noise from flowing water.
You can see that at 19 gpm water will emerge from the pipe but with
virtually no pressure at the outlet.
Interestingly your temperature is near the point where water's density
drops markedly and where it's viscosity starts to increase quickly.
These pressure drops will change (improve) as the temperature is increased.
I believe these numbers to be correct but since I didn't have a
calculator handy when I did the you'll have to accept slide rule
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