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Friction head loss in PVC and PP plastic pipes
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The pressure head loss (feet per 100 feet) in straight plastic pipes made of materials as PVC, PP or similar, can be estimated from the table below.
| Pressure Friction Head Loss (ft/100 ft) | ||||||||||||
| Volume Flow | Pipe Dimension (inches) | |||||||||||
|
Gallons Per Minute |
Gallons Per Hour (GPH)2) |
|||||||||||
| 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 | 6 | ||
| 1 | 60 | 4.3 | 1.4 | 0.4 | 0.1 | 0.1 | ||||||
| 2 | 120 | 15.1 | 4.84 | 1.2 | 0.4 | 0.2 | ||||||
| 4 | 240 | 55.0 | 17.1 | 4.2 | 1.3 | 0.5 | 0.2 | |||||
| 5 | 300 | 84.4 | 25.8 | 6.3 | 1.9 | 0.7 | 0.2 | |||||
| 6 | 360 | 36.3 | 8.8 | 2.7 | 1.2 | 0.3 | 0.1 | |||||
| 8 | 480 | 63.7 | 15.2 | 4.6 | 1.8 | 0.6 | 0.2 | |||||
| 10 | 600 | 97.5 | 26.0 | 6.9 | 3.6 | 0.8 | 0.3 | 0.1 | ||||
| 20 | 1200 | 86.9 | 25.1 | 9.7 | 2.9 | 0.9 | 0.4 | 0.1 | ||||
| 30 | 1800 | 18.7 | 6.3 | 1.8 | 0.8 | 0.3 | ||||||
| 40 | 2400 | 29.4 | 10.7 | 3.1 | 1.3 | 0.4 | 0.1 | |||||
| 50 | 3000 | 16.5 | 4.7 | 1.9 | 0.7 | 0.2 | ||||||
| 60 | 3600 | 23.5 | 6.6 | 2.7 | 0.9 | 0.3 | ||||||
| 70 | 4200 | 8.8 | 3.7 | 1.2 | 0.3 | |||||||
| 80 | 4800 | 11.4 | 4.7 | 1.6 | 0.4 | |||||||
| 90 | 5400 | 14.3 | 5.8 | 2.0 | 0.5 | |||||||
| 100 | 6000 | 7.1 | 2.4 | 0.6 | 0.1 | |||||||
| 125 | 7500 | 10.8 | 3.8 | 1.0 | 0.1 | |||||||
| 150 | 9000 | 5.2 | 1.3 | 0.2 | ||||||||
1) GPM = gallons per minute
2) GPH = gallons per hour
A flow of 10 GPM in a 2" pipe gives a head loss of0.3 feet water column per 100 feet of pipe.
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