Lined Pipes - Pressure Loss vs. Water Flow
Pressure drop diagrams for PTFE, PP, PFA and PVDF lined pipes.
The diagrams below indicates the pressure loss for water flow in PTFE-lined steel pipes schedule 40.
The pressure drop calculations are made with the D'Arcy-Weisbach Equation.
- Fluid : Water
- Pipe : PTFE-lined Steel Pipes - Schedule 40
- Temperature : 20.0 oC (68.0 oF)
- Density : 998.3 kg/m3 (62.0 lb/ft3)
- Kinematic Viscosity : 1.004 10-6 m2/s (0.01 stokes) (1.08E-5 ft2/s)
- Pipe Roughness Coefficient : 3.0 10-6 m
Pressure Drop - Imperial Units
- 1 gal (US)/min =6.30888x10-5 m3/s = 0.227 m3/h = 0.06309 dm3(litre)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min
- 1 ft/s = 0.3048 m/s
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC) = 2.0416 in mercury at 62oF (16.7oC) = 51.8 mm mercury at 62oF (16.7oC) = 703.6 kg/m2 = 2.307 Ft. H2O
Pressure Drop - SI units
- 1 Pa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.02x10-4 m H2O = 9.869x10-6 atm = 1.45x10-4 psi (lbf/in2)
- 1 liter/s = 10-3 m3/s = 3.6 m3/h = 0.03532 ft3/s = 2.1189 ft3/min (cfm) = 13.200 Imp.gal (UK)/min = 15.852 gal (US)/min = 792 Imp. gal (UK)/h
- 1 m/s = 3.6 km/h = 196.85 ft/min = 2.237 mph
The diagram above is based on the inside thickness of schedule 40 steel pipes with PTFE as the lining material. Common thickness of other lining materials:
| Lining Material | Common Thickness of Lining Material (inches) | ||||||
|---|---|---|---|---|---|---|---|
| Pipe Diameter (inches) | |||||||
| 1 | 1 1/2 | 2 | 3 | 4 | 6 | 8 | |
| PTFE*) | 0.130 | 0.150 | 0.160 | 0.160 | 0.160 | 0.275 | 0.310 |
| PP | 0.135 | 0.160 | 0.175 | 0.175 | 0.210 | 0.220 | 0.220 |
| PFA | 0.113 | 0.114 | 0.114 | 0.130 | 0.150 | 0.145 | 0.140 |
| PVDF | 0.125 | 0.125 | 0.125 | 0.125 | 0.145 | 0.160 | 0.185 |
- PTFE - PolyTetraFluoroEthylene
- PP - PolyPropylene
- PFA - Perfluoroalkoxy Fluorocarbon
- PVDF - Polyvinylidene Fluoride
*) used in the diagrams above
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