Polyethylene - PE Pipes - Pressure Drops

Water flow in SDR pressure rated pipes - pressure loss and velocity tables - imperial and SI units

The pressure drop calculations below are made with the D'Arcy-Weisbach Equation.

Nominal Pipe Size: 1/2"

  • Inside Diameter: 0.0158 m (0.62 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
3.0E-50.030.480.1530.535503620.1570.36
4.0E-50.040.630.20.6757855900.260.59
5.0E-50.050.790.260.8486298800.380.88
6.0E-50.060.950.311.01183412070.521.21
7.0E-50.071.110.361.171530215600.681.56
8.0E-50.081.270.411.341946019840.861.99
9.0E-50.091.430.461.512329823761.032.4
1.0E-40.11.590.511.672876329331.272.9
1.1E-40.111.740.561.843380934471.493.5
1.2E-40.121.90.612.03905239821.734.0
1.3E-40.132.10.662.24444345321.964.5
1.4E-40.142.20.712.35154352562.35.3
1.5E-40.152.40.772.55732158452.55.9
1.6E-40.162.50.822.76521866502.96.7
1.7E-40.172.70.872.87125072653.17.3
1.8E-40.182.90.923.07987981453.58.2
1.9E-40.193.00.973.28900190753.99.1
2.0E-40.23.21.023.39532997214.29.7
3.0E-40.34.81.535.0199697203638.820

Nominal Pipe Size: 3/4"

  • Inside Diameter: 0.021 m (0.82 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
4.0E-50.040.630.1150.3815221550.0670.155
5.0E-50.050.790.1440.4722292270.0990.23
6.0E-50.060.950.1730.5730673130.1360.31
7.0E-50.071.110.20.6639804060.1760.41
8.0E-50.081.270.230.7649455040.220.5
9.0E-50.091.430.260.8560996220.270.62
1.0E-40.11.590.290.9573317480.320.75
1.1E-40.111.740.321.0486318800.380.88
1.2E-40.121.90.351.14998610180.441.02
1.3E-40.132.10.381.231172011950.521.2
1.4E-40.142.20.41.331320413460.581.35
1.5E-40.152.40.431.421471115000.651.5
1.6E-40.162.50.461.521673817070.741.71
1.7E-40.172.70.491.611832318680.811.87
1.8E-40.182.90.521.72054220950.912.1
1.9E-40.193.00.551.82288823341.012.3
2.0E-40.23.20.581.892456825051.092.5
3.0E-40.34.80.872.84992950912.25.1
4.0E-40.46.31.153.88559387283.88.7
5.0E-40.57.91.444.7123833126275.512.6
6.0E-40.69.51.735.7171186174567.617.5

Nominal Pipe Size: 1"

  • Inside Diameter: 0.027 m (1.05 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
7.0E-50.071.110.1220.412161240.0540.124
8.0E-50.081.270.140.4615161550.0670.155
9.0E-50.091.430.1570.5218731910.0830.191
1.0E-40.11.590.1750.5722562300.10.23
1.1E-40.111.740.1920.6326612710.1180.27
1.2E-40.121.90.210.6930863150.1360.31
1.3E-40.132.10.230.7435263600.1560.36
1.4E-40.142.20.240.839794060.1760.41
1.5E-40.152.40.260.8645684660.20.47
1.6E-40.162.50.280.9250535150.220.52
1.7E-40.172.70.30.9755415650.240.57
1.8E-40.182.90.311.0362126330.270.63
1.9E-40.193.00.331.0967186850.30.69
2.0E-40.23.20.351.1574447590.330.76
3.0E-40.34.80.521.721522615530.671.55
4.0E-40.46.30.72.32526425761.122.6
5.0E-40.57.90.872.93806638821.683.9
6.0E-40.69.51.053.45278553822.35.4
7.0E-40.711.11.224.06908370443.17.1
8.0E-40.812.71.44.68662188333.88.8
9.0E-40.914.31.575.2109630111794.811.2
0.00101.015.91.755.7129706132265.713.2
0.00111.117.41.926.3156944160046.916.0
0.00121.219.02.16.9178656182187.918.2

Nominal Pipe Size: 1 1/4"

  • Inside Diameter: 0.035 m (1.38 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
1.3E-40.132.10.1350.4410411060.0460.106
1.4E-40.142.20.1460.4811781200.0520.12
1.5E-40.152.40.1560.5113171340.0580.134
1.6E-40.162.50.1660.5514591490.0640.149
1.7E-40.172.70.1770.5816471680.0730.168
1.8E-40.182.90.1870.6117971830.0790.183
1.9E-40.193.00.1970.6520022040.0880.2
2.0E-40.23.20.210.6821572200.0950.22
3.0E-40.34.80.311.0244374520.1960.45
4.0E-40.46.30.421.3673957540.330.75
5.0E-40.57.90.521.71078511000.481.1
6.0E-40.69.50.622.01497515270.661.53
7.0E-40.711.10.732.41962820010.872.0
8.0E-40.812.70.832.72465125141.092.5
9.0E-40.914.30.943.13119931811.383.2
0.00101.015.91.043.43697637701.633.8
0.00111.117.41.143.84474145621.984.6
0.00121.219.01.254.15102752032.35.2
0.00131.3211.354.45988661072.66.1
0.00141.4221.464.86945470823.17.1
0.00151.5241.565.17626377773.47.8
0.00161.6251.665.58677188483.88.9
0.00171.7271.775.89795699894.310.0
0.00181.8291.876.1109819111984.911.2
0.00191.9301.976.5116799119105.211.9
0.00202.0322.16.8129417131975.713.2

Nominal Pipe Size: 1 1/2"

  • Inside Diameter: 0.041 m (1.61 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
2.0E-40.23.20.1510.510341050.0460.106
3.0E-40.34.80.230.7520742120.0920.21
4.0E-40.46.30.30.9934643530.1530.35
5.0E-40.57.90.381.2450645160.220.52
6.0E-40.69.50.451.4970407180.310.72
7.0E-40.711.10.531.7492409420.410.94
8.0E-40.812.70.611.991162211850.511.19
9.0E-40.914.30.682.21470915000.651.5
0.00101.015.90.762.51746117810.771.78
0.00111.117.40.832.72112821540.932.2
0.00121.219.00.913.02413824611.072.5
0.00131.3210.983.22832928891.252.9
0.00141.4221.063.53148632111.393.2
0.00151.5241.143.73614536861.63.7
0.00161.6251.214.04112441931.824.2
0.00171.7271.294.24440745281.964.5
0.00181.8291.364.54978550772.25.1
0.00191.9301.444.75547056562.55.7
0.00202.0321.515.06146362672.76.3
0.00303.0482.37.5125720128205.612.8

Nominal Pipe Size: 2"

  • Inside Diameter: 0.053 m (2.1 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
4.0E-40.46.30.1810.5910221040.0450.104
5.0E-40.57.90.230.7415001530.0660.153
6.0E-40.69.50.270.8920902130.0920.21
7.0E-40.711.10.321.0427502800.1220.28
8.0E-40.812.70.361.1934673540.1530.35
9.0E-40.914.30.411.3442324320.1870.43
0.00101.015.90.451.4950315130.220.51
0.00111.117.40.51.6460876210.270.62
0.00121.219.00.541.7869667100.310.71
0.00131.3210.591.9381758340.360.83
0.00141.4220.632.194819670.420.97
0.00151.5240.682.21044910650.461.07
0.00161.6250.732.41188812120.531.21
0.00171.7270.772.51342113690.591.37
0.00181.8290.822.71441914700.641.47
0.00191.9300.862.81606616380.711.64
0.00202.0320.913.01780218150.791.82
0.00303.0481.364.53657137291.623.7
0.00404.0631.815.96191963142.76.3
0.00505.0792.37.49191193724.19.4
0.00606.0952.78.9132351134965.813.5
0.00707.01113.210.4170663174037.517.4

Nominal Pipe Size: 2 1/2"

  • Inside Diameter: 0.063 m (2.5 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
7.0E-40.711.10.220.7411991220.0530.122
8.0E-40.812.70.260.8415131540.0670.154
9.0E-40.914.30.290.9518491890.0820.189
0.00101.015.90.321.0522012240.0970.22
0.00111.117.40.351.1626642720.1180.27
0.00121.219.00.381.2630533110.1350.31
0.00131.3210.421.3735833650.1580.37
0.00141.4220.451.4739954070.1770.41
0.00151.5240.481.5845864680.20.47
0.00161.6250.511.6852185320.230.53
0.00171.7270.551.7956555770.250.58
0.00181.8290.581.8963406470.280.65
0.00191.9300.612.070647200.310.72
0.00202.0320.642.178277980.350.8
0.00303.0480.963.21614416460.711.65
0.00404.0631.284.22739627941.212.8
0.00505.0791.65.34076841571.84.2
0.00606.0951.926.35577156872.55.7
0.00707.01112.27.47591077413.47.7
0.00808.01272.68.49392995784.29.6
0.00909.01432.99.5118879121225.312.1
0.0110.01593.210.5138611141346.114.1
0.01111.01743.511.6167719171027.417.1
0.01212.01903.812.6199600203538.820

Nominal Pipe Size: 3"

  • Inside Diameter: 0.078 m (3.1 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.00121.219.00.250.8211301150.050.115
0.00131.3210.270.8912791300.0570.131
0.00141.4220.290.9614831510.0660.151
0.00151.5240.311.0316401670.0720.167
0.00161.6250.331.118651900.0820.19
0.00171.7270.361.1721062150.0930.21
0.00181.8290.381.2422702310.10.23
0.00191.9300.41.325292580.1120.26
0.00202.0320.421.3728032860.1240.29
0.00303.0480.632.158025920.260.59
0.00404.0630.842.794179600.420.96
0.00505.0791.053.41401414290.621.43
0.00606.0951.264.12018020580.892.1
0.00707.01111.464.82609326611.152.7
0.00808.01271.675.53408134751.513.5
0.00909.01431.886.24086441671.814.2
0.0110.01592.16.95044951442.25.1
0.01111.01742.37.66104362252.76.2
0.01212.01902.58.27264674083.27.4
0.01313.02062.78.98052282113.68.2
0.01414.02222.99.69338695234.19.5
0.01515.02383.110.3107204109324.710.9
0.01616.02543.311.0121974124385.412.5
0.01717.02693.611.7137697140416.114.1
0.01818.02853.812.4145293148156.414.8
0.01919.03014.013.0161885165077.216.5
0.02203174.213.7179373182917.918.3

Nominal Pipe Size: 4"

  • Inside Diameter: 0.102 m (4.0 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.00303.0480.371.215831610.070.162
0.00404.0630.491.6126972750.1190.28
0.00505.0790.612.040314110.1780.41
0.00606.0950.732.455415650.240.57
0.00707.01110.862.871837320.320.73
0.00808.01270.983.293819570.410.96
0.00909.01431.13.61127911500.51.15
0.0110.01591.224.01392514200.621.42
0.01111.01741.354.41685017180.741.72
0.01212.01901.474.81899719370.841.94
0.01313.02061.595.22229522730.992.3
0.01414.02221.715.62585726371.142.6
0.01515.02381.846.02968330271.313.0
0.01616.02541.966.43189632521.413.3
0.01717.02692.16.83600836721.593.7
0.01818.02852.27.24036941161.784.1
0.01919.03012.37.64497945861.994.6
0.02203172.48.04983850822.25.1
0.03304763.712.0105539107624.710.8
0.04406344.916.1175898179367.818.0

Nominal Pipe Size: 6"

  • Inside Diameter: 0.154 m (6.1 inches)
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.00707.01110.381.2310071030.0450.103
0.00808.01270.431.4112561280.0550.128
0.00909.01430.481.5915891620.070.162
0.0110.01590.541.7618681910.0830.191
0.01111.01740.591.9422612310.10.23
0.01212.01900.642.126912740.1190.27
0.01313.02060.72.330003060.1330.31
0.01414.02220.752.534793550.1540.36
0.01515.02380.812.639944070.1770.41
0.01616.02540.862.845444630.20.46
0.01717.02690.913.048604960.210.5
0.01818.02850.973.254485560.240.56
0.01919.03011.023.360716190.270.62
0.02203171.073.567266860.30.69
0.03304761.615.31429414580.631.46
0.04406342.17.02391624391.062.4
0.05507932.78.83503335721.553.6
0.06609513.210.65044851442.25.1
0.077011103.812.36866570023.07.0
0.088012684.314.18370685353.78.5
0.099014274.815.9105940108034.710.8
0.110015855.417.6130790133375.813.4
0.1111017445.919.4158256161377.016.2
0.1212019026.421188338192058.319.2
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC) = 2.0416 in mercury at 62oF (16.7oC) = 51.8 mm mercury at 62oF (16.7oC) = 703.6 kg/m2 = 0.06895 atm = 2.307 Ft. H2O = 16 ounces
  • 1 ft/s = 0.3048 m/s
  • 1 gal (US)/min =6.30888x10-5 m3/s = 0.0227 m3/h = 0.06309 dm3(litre)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min = 0.8327 Imperial gal (UK)/min

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