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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 DiameterInside 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 DiameterInside 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 SizeOuter DiameterInside 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 SizeOuter DiameterInside 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 SizeOuter DiameterInside 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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