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Plastic Pipes - Friction Head Loss vs. Water Flow

Friction head loss (ft/100 ft) vs. water flow in plastic pipes like PVC, PP, PE or PEH.

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The friction head loss (feet H₂O per 100 feet pipe) in straight plastic pipes made of PVC, PP, PE, PEH or similar - can be estimated from the table below.

Head losses are calculated for PVC pipe Schedule 40 by using the Hazen-Williams equation and the Hazen-Williams roughness constant c = 145. Note that minor loss in fittings must be added when calculating total head loss in a pipe line.

For full table with larger dimensions - rotate the screen!

Friction Head Loss (ft H₂O/100 ft pipe)
Volume Flow		Nominal Pipe Diameter (inches)
(GPM)¹⁾	(GPH)²⁾	Nominal Pipe Diameter (inches)
		3/8	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	4	6
		Nominal Inside Diameter (inches)
		0.493	0.622	0.824	1.049	1.380	1.610	2.067	2.469	3.068	4.026	6.065
1	60	3.3	1.1	0.3
2	120	11.8	3.8	1.0	0.3	0.1
4	240	42.5	13.7	3.5	1.1	0.3	0.1
5	300	64.2	20.7	5.3	1.6	0.4	0.2
6	360		29.0	7.4	2.3	0.6	0.3
8	480		49.5	12.6	3.9	1.0	0.5	0.1
10	600		74.7	19.0	5.9	1.6	0.7	0.2	0.1
20	1200			68.6	21.2	5.6	2.6	0.8	0.3	0.1
30	1800					11.8	5.6	1.7	0.7	0.2
40	2400					20.1	9.5	2.8	1.2	0.4	0.1
50	3000						14.4	4.3	1.8	0.6	0.2
60	3600						20.1	6.0	2.5	0.9	0.2
70	4200							7.9	3.3	1.2	0.3
80	4800							10.2	4.3	1.5	0.4
90	5400							12.6	5.3	1.9	0.5
100	6000								6.5	2.3	0.6	0.1
125	7500								9.8	3.4	0.9	0.1
150	9000									4.8	1.3	0.2

¹⁾ GPM = US gallons per minute

²⁾ GPH = US gallons per hour

1 US gallon/min = 6.30888x10^-5 m³/s = 0.227 m³/h = 0.0631 dm³(liter)/s = 2.228x10^-3 ft³/s = 0.1337 ft³/min = 0.8327 Imperial gal (UK)/min
1 ft H₂O = 0.3048 m H₂O = 0.4335 psi = 62.43 lbs/ft²

Example - Friction Head Loss in a Plastic Pipe

A flow of 10 GPM in a 2" pipe gives a head loss of 0.2 feet water column per 100 feet of pipe.

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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.

Related Documents

ASTM D1785 and ASTM F441 - PVC and CPVC Pipes Schedule 40 & 80 - Standard dimensions and weight of PVC - Polyvinyl Chloride - and CPVC - Chlorinated Polyvinyl Chloride.
ASTM D2241 - Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series) - Dimensions - Dimensions of PVC pipe SDR series.
ASTM D2846 - CPVC Plastic Hot and Cold Water Distribution Tubes - Dimensions - Dimensions of CTS - Copper Tube Sized CPVC (Chlorinated Poly Vinyl Chloride) tubes.
ASTM F2389 Pressure-rated Polypropylene (PP) - Dimensions - Dimensions of pressure rated PP pipes according ASTM F2389.
ASTM F876 - PEX Tube - Dimensions - Dimensions of PEX tubes.
BS 7291 - Thermoplastics Pipes for Hot and Cold Water - Dimensions - Dimensions of thermoplastic pipes - PEX and PB according BS 7291.
CPVC Pipes - Operating and Collapsing Pressures vs. Schedule and Size - Maximum operating and bursting pressures of CPVC - Chlorinated Poly (Vinyl Chloride) - piping systems.
Fluid Flow Friction Loss - Hazen-Williams Coefficients - Hazen-Williams friction loss coefficients for commonly used piping materials.
Hazen-Williams Friction Loss Equation - calculating Head Loss in Water Pipes - Friction head loss (ft_H2O per 100 ft pipe) in water pipes can be estimated with the empirical Hazen-Williams equation.
Hot Water Systems - Equivalent Length vs. Fittings Resistance - Equivalent length of fittings like bends, returns, tees and valves in hot water heating systems - equivalent length in feet and meter.
ISO 11922 - Thermoplastics Pipes for the Conveyance of Fluids - Dimensions - Dimensions of plastic pipes according ISO 11922 - metric and imperial units.
Lined Pipes - Pressure Loss vs. Water Flow - Pressure drop diagrams for PTFE, PP, PFA and PVDF lined pipes.
PE (PolyEthylene) Pipes - Pressure Loss vs. Water Flow - Water flow in SDR pressure rated PE-pipes - pressure loss and velocities - Imperial and SI units.
PE (PolyEthylene) Pipes - Pressure Ratings vs. Size - Water pressure ratings for schedule 40 and schedule 80 Polyethylene plastic pipes
PE (PolyEthylene) Pipes - Pressure vs. Temperature Ratings - Polyethylene pipe temperature and maximum operating pressure.
Plastic Pipes - Maximum Operating Temperatures - Piping materials like ABS, PE, PVC, CPVC, PB, PP and SR and pressure and operating temperature limits.
Plastics - Recycling Codes and Labeling - Symbol codes and labeling used for recycling plastic products like bottles, containers and packagin.
PP Pipes - Support Spacing - Maximum distance between PolyPropylene pipes supports.
PP Polypropylene - Chemical Resistance - Chemical resistance of Polypropylene - PP - to acids, bases, organic substances and solvents.
PVC Pipes - Equivalent Length and Pressure Loss in Fittings - Minor loss in PVC and CPVC fittings expressed as equivalent length of straight pipe.
PVC Pipes Schedule 40 - Friction Loss vs. Water Flow - 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.
PVC Pipes Schedule 40 - Friction Loss vs. Water Flow Diagrams - Friction loss (psi/100 ft) and velocity for water flow in plastic PVC pipe schedule 40.
SDR (Standard Dimension Ratio) and S Pipe Series - The Standard Dimension Ratio - SDR - is used to rate pressure pipes.
Thermoplastic Pipes - Supporting Distances vs. Temperature - Maximum space between supports for PVC, CPVC, PVDF and PP pipes vs. temperature.

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