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Plastic Pipes - Friction Head Loss

Friction head loss (ft/100 ft) in plastic pipes - PVC, PP, PE, 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.

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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 Drop - 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 Pressure Ratings - Maximum operating and bursting pressures of CPVC - Chlorinated Poly (Vinyl Chloride) - piping systems
Hazen-Williams Coefficients - Hazen-Williams coefficients for piping materials
Hazen-Williams 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
ISO 11922 - Thermoplastics pipes for the conveyance of fluids - Dimensions - Dimensions of plastic pipes according ISO 11922 - metric and imperial units
Lined Pipes and Pressure Drop - Pressure drop diagrams for PTFE, PP, PFA and PVDF lined pipes
PE - PolyEthylene Pipes, Flow and Pressure Loss - Water flow in SDR pressure rated PE-pipes - pressure loss and velocities - Imperial and SI units
PE Pipes - Pressure Ratings - Water pressure ratings for schedule 40 and schedule 80 Polyethylene plastic pipes
PE Pipes - Temperature and Pressure Ratings - PolyEthylene pipe - temperature and maximum operating pressure
Plastic Pipes - Operating Temperatures - ABS, PE, PVC, CPVC, PB, PP and SR - pressure and operating temperatures
Plastics - Recycling Codes and Labels - Symbols used for recycling plastic products like bottles, containers and packaging
PP - Polypropylene - Chemical Resistance - Chemical resistance of Polypropylene - PP - to acids, bases, organic substances and solvents
PP Pipes - Support Spacing - Maximum distance between PolyPropylene pipes supports
PVC - Friction Loss in Fittings and Equivalent Length - Minor loss in PVC and CPVC fittings as equivalent length of straight pipe
PVC Pipes - Friction Loss and Flow Velocities Schedule 40 - 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 and Velocity Diagrams - Friction loss (psi/100 ft) and velocity for water flow in plastic PVC pipe schedule 40
Resistance and Fittings Equivalent Length in Hot Water Systems - Equivalent length of fittings like bends, returns, tees and valves in hot water heating systems - equivalent length in feet and meter
SDR - Standard Dimension Ratio - and Pipe Series - S - It is common to use the Standard Dimension Ratio - SDR - as method of rating pressure piping
Thermoplastic Pipes - Temperature and Support Distance - Maximum space between supports for PVC, CPVC, PVDF and PP pipes

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