Friction Loss Calculator
Calculate pipe friction loss using Hazen-Williams
Flow Parameters
Fitting Equivalent Lengths
Friction Loss Results
Total Head Loss
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Pressure Drop
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Loss per 100 ft
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Pipe Loss
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Fitting Loss
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Flow Velocity
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Equivalent Length Reference
| Fitting | 1/2" | 3/4" | 1" | 1-1/2" | 2" |
|---|---|---|---|---|---|
| 90 Elbow | 1.5 | 2 | 2.5 | 4 | 5 |
| 45 Elbow | 0.8 | 1 | 1.2 | 2 | 2.5 |
| Tee (Branch) | 3 | 4 | 5 | 8 | 10 |
| Gate Valve | 0.3 | 0.4 | 0.5 | 0.8 | 1 |
| Ball Valve | 0.3 | 0.4 | 0.5 | 0.8 | 1 |
Friction Loss Table (PSI per 100 ft)
| GPM | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" |
|---|
Hazen-Williams Formula
hf = 10.67 x L x Q1.85 / (C1.85 x D4.87)
hf = Head loss (ft)
L = Length (ft)
Q = Flow (cfs)
C = Roughness coefficient
D = Diameter (ft)
PSI = hf x 0.433