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# Plastic Pipes - Friction Head Loss vs. Water Flow

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!

Plastic Pipes - Friction Head Loss vs. Water Flow
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.

## 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 (ftH2O 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 - PolyPropylene 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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