Simple Formula for pressure in pipe
Simple Formula for pressure in pipe
(OP)
I am looking for a simple formula to compute pressure drop in a straight new pipe(basically no friction). Its just a simple 2' straight pipe with water flowing in it. How do you figure pressure drop? Is there a simple formula for pressure drop in a pipe?
Thank you for your time.
Thank you for your time.





RE: Simple Formula for pressure in pipe
Unless the pipe is awfully small or the flow rate is awfully high, the pressure drop in 2' will be negligible.
RE: Simple Formula for pressure in pipe
V = 1.318C * r^.63 * s^.54
V = avg velocity
C = discharge coefficient
r = hydraulic radius
s = h/l = energy loss per foot of pipe
values for C can be found in many textbooks and vary depending upon size, type and condition of pipe
you may also want to try the Handbook of Hydraulics by Brater and King
RE: Simple Formula for pressure in pipe
RE: Simple Formula for pressure in pipe
Once again thank you for all the help.
RE: Simple Formula for pressure in pipe
I think you'll have not much -- something between 0.5 PSI and 1 PSI drop. If you desire accuracy, plug your data into the calculator on this link:
http:
If you consider your two elbows to be equal to about 4 feet each of equivalent straight pipe length, you'll be pretty close.
Enjoy!
Old Dave
RE: Simple Formula for pressure in pipe
RE: Simple Formula for pressure in pipe
RE: Simple Formula for pressure in pipe
0.86 psi or ~2 ft H2O drop (based on an hydraulic length of 10.53' and a pressure drop of 18.8'/100').