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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.

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

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Hazen-Williams Coefficients - Hazen-Williams coefficients for piping materials
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