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Lined Pipes - Pressure Loss vs. Water Flow

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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

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