Fluid Flow Design and Engineering
Calculator will determine Pipe Flow Rate and Velocity required based on Head Loss, h_{L}, and Frictional Pressure Drop, DP_{f}, for given flow rate, Q, pipe diam., D, pipe length, L, pipe roughness, e, and fluid properties, r & m.
Moody Friction Factor Equation
Pipe Roughness Values
Preview: Pipe Flow Rate and Velocity Calculator
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NOTE: This is an iterative calculation, because an assumed value of Q is used to start the
calculations. If the final calculated value of Q is different from the assumed value, then the
assumed value of Q should be replaced with the calculated value of Q, leading to a new
calculated value for Q. This should be repeated as many times as necessary to get the
calculated value for Q to be the same as the assumed value. This iteration typically converges
rather rapidly.
This spreadsheet shows only the final assumed and calculated values of Q (when they are equal).
If the initial assumed value of Q was 1.5 cfs, then subsequent calculated and assumed values
for Q, leading to the final solution are as follows:
Assumed Q, cfs 
Calculated Q, cfs 
1.5 
0.85 
0.85 
0.83 
0.83 
0.83 
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