# Plastic Pipes - Friction Head Loss

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

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 FlowNominal Pipe Diameter (inches)
(GPM)1)
(GPH)2)
3/81/23/411 1/41 1/222 1/2346
Nominal Inside Diameter (inches)
0.4930.6220.8241.0491.3801.6102.0672.4693.0684.0266.065
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.

## Tag Search

• en: major pressure loss plastic pipes
• es: grandes tubos de plástico de pérdida de presión
• de: Hauptdruckverlust Kunststoffrohren

## Search the Engineering ToolBox

- "Search is the most efficient way to navigate the Engineering ToolBox!"

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!