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# 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.

### 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:

Lined Pipes - Lining Materials
Lining Material Common Thickness of Lining Material (inches)
Pipe Diameter (inches)
11 1/223468
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

## Related Topics

• ### Fluid Flow and Pressure Loss

Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.

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Pressure loss (bar/100 m) and velocy in PE, PEH or PVC pipes with water flow.
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Water flow in thermoplastic PVC and CPVC pipes Schedule 40 - friction loss (ft/100 ft, psi/100 ft) and flow velocities at dimensions ranging 1/2 to 16 inches.
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Friction loss (psi/100 ft) and velocity for water flow in plastic PVC pipe schedule 40.

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## Citation

• The Engineering ToolBox (2008). Lined Pipes - Pressure Loss vs. Water Flow. [online] Available at: https://www.engineeringtoolbox.com/lined-pipe-pressure-loss-d_1178.html [Accessed Day Month Year].

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12.8.9