# Pressure Loss in Pipes from Friction

Calculate the pressure loss caused by friction in a section of irrigation pipeline.

Material
Flow Rate US gal/min
Inside Pipe Diameter in
Sraight Pipe Length ft
Fittings and Valves Equivalent Length ft

#### Results:

 Pressure Loss psi/ per foot of pipe Pressure Loss Straight Pipe psi/for straight pipe Pressure Loss for Total Section psi/for straight pipe plus fittings

#### Calculation

1. select the pipe material in use
2. the flow rate of the water in (US gallons per minute)
3. inside diameter of the pipe (inches)
4. length of the pipe (feet)
5. Fittings and Valves Equivalent Length

#### Results

1. friction loss per foot of pipe psi/ one foot
2. friction loss for the calculated amount of straight pipe psi/feet
3. total friction loss straight pipe plus equivalent length of fittings

 PVC and CPVC Pipes - Schedule 40 Nominal Size Outer Diameter Inside Diameter 1/8" 0.405" .249" 1/4" 0.540" .344" 3/8" 0.675" .473" 1/2" 0.840" 0.622" 3/4" 1.05" .825" 1" 1.315" 1.049" 1 1/4" 1.66" 1.38" 1 1/2" 1.9" 1.61" 2" 2.375" 2.067" 2 1/2" .203" 2.469" 3" 3.5" 3.068" 4" 4.5" 4.026" 5" 5.563" 5.047" 6" 6.625" 6.065" 8" 8.625" 7.981" 10" 10.75" 10.02" 12" 12.75" 11.938" 14" 14" 13.124" 16" 16" 15" 18" 18" 16.876" 20" 20" 18.814" 24" 24" 22.626"
 PVC and CPVC Pipes - Schedule 80 Nominal Size Outer Diameter Inside Diameter 1/8" 0.405" 0.195" 1/4" 0.54" 0.302" 3/8" 0.675" 0.403" 1/2" 0.84" 0.546" 3/4" 1.05" 0.742" 1" 1.315" 0.957" 1 1/4" 1.660" 1.278" 1 1/2" 1.900" 1.500" 2" 2.375" 1.939" 2 1/2" 2.875" 2.323 3" 3.500" 2.900" 4" 4.500" 3.826" 5" 5.563" 4.813" 6" 6.625" 5.761" 8" 8.625" 7.625" 10" 10.750" 9.564" 12" 12.750" 11.376" 14" 14.000" 12.500" 16" 16.000" 14.314" 18" 18.000" 16.126" 20" 20.000" 17.938" 24" 24.000" 21.564"
 PVC Class 160 IPS Plastic Pipe Nominal Size Outer Diameter Inside Diameter 1/2" 0.840" 0.696" 3/4" 1.050" 0.910" 1" 1.315" 1.175" 1-1/4" 1.660" 1.512" 1-1/2" 1.900" 1.734" 2" 2.375" 2.173" 2-1/2" 2.875" 2.635" 3" 3.500" 3.210" 4" 4.500" 4.134" 6" 6.625" 6.084" 8" 8.625" 7.921" 10" 10.750" 9.874" 12" 12.750" 11.710" 14" 14" 12.860" 16" 16" 14.696" 18" 18" 16.532"
 PVC Class 200 IPS Plastic Pipe Nominal Size Outer Diameter Inside Diameter 1/2" 0.840" 0.696" 3/4" 1.050" 0.910" 1" 1.315" 1.169" 1-1/4" 1.660" 1.482" 1-1/2" 1.900" 1.700" 2" 2.375" 2.129" 2-1/2" 2.875" 2.581" 3" 3.500" 3.146" 4" 4.500" 4.046' 6" 6.625" 5.955" 8" 8.625" 7.755" 10" 10.750" 9.666" 12" 12.750" 11.464" 14" 14" 12.588" 16" 16" 14.384" 18" 18" 15.246"
 PVC Class 315 IPS Plastic Pipe Nominal Size Outer Diameter Inside Diameter 1/2" 0.840" 0.696" 3/4" 1.050" 0.874" 1" 1.315" 1.101" 1-1/4" 1.660" 1.394" 1-1/2" 1.900" 1.598" 2" 2.375" 1.983" 2-1/2" 2.875" 2.423" 3" 3.500" 2.948" 4" 4.500" 3.794" 6" 6.625" 5.583"

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