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Lined Pipes - Pressure Loss vs. Water Flow

Pressure drop diagrams for PTFE, PP, PFA and PVDF lined pipes.

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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.

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

Lined steel pipes - pressure drop diagram - imperial units - psi

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 62^oF (16.7^oC) = 703.1 mm H₂O at 62^oF (16.7^oC) = 2.0416 in mercury at 62^oF (16.7^oC) = 51.8 mm mercury at 62^oF (16.7^oC) = 703.6 kg/m² = 2.307 Ft. H₂O

Pressure Drop - SI units

Lined steel pipes - pressure drop diagram - imperial units - pa

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:

Common Thickness of Lining Material (inches)
Lining Material	Pipe Diameter (inches)
Lining Material	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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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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