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Steel Pipes Schedule 40 - Pressure Loss

Water flow and pressure loss in schedule 40 steel pipes - Imperial and SI units - gallons per minute, liters per second and cubic meters per hour.

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36"

The tables below can be used to estimate friction loss or pressure drop for water flowing through ASME/ANSI B36.10/19 schedule 40 steel pipes.

The pressure drop calculations are based on the D'Arcy-Weisbach Equation with the following parameters:

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Nominal Pipe Size: 3/8"

  • Inside Diameter: 0.0125 m (0.49 inches)

For full table with Pressure Drops - rotate the screen!

Steel Pipes Schedule 40 - Pressure Loss - 3/8"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
3.0E-5 0.03 0.48 0.24 0.8 11455 1168 0.51 1.17
4.0E-5 0.04 0.63 0.33 1.07 19091 1947 0.84 1.95
5.0E-5 0.05 0.79 0.41 1.34 28504 2907 1.26 2.9
6.0E-5 0.06 0.95 0.49 1.6 39137 3991 1.73 4.0
7.0E-5 0.07 1.11 0.57 1.87 51971 5299 2.3 5.3
8.0E-5 0.08 1.27 0.65 2.1 66183 6749 2.9 6.8
9.0E-5 0.09 1.43 0.73 2.4 81615 8322 3.6 8.3
1.0E-4 0.1 1.59 0.81 2.7 98108 10004 4.3 10.0
1.1E-4 0.11 1.74 0.9 2.9 118710 12105 5.2 12.1
1.2E-4 0.12 1.9 0.98 3.2 137457 14016 6.1 14.0
1.3E-4 0.13 2.1 1.06 3.5 161321 16450 7.1 16.5
1.4E-4 0.14 2.2 1.14 3.7 181897 18548 8.0 18.6

Nominal Pipe Size: 1/2"

  • Inside Diameter: 0.0158 m (0.62 inches)
Steel Pipes Schedule 40 - Pressure Loss - 1/2"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
3.0E-5 0.03 0.48 0.153 0.5 3698 377 0.163 0.38
4.0E-5 0.04 0.63 0.2 0.67 6180 630 0.27 0.63
5.0E-5 0.05 0.79 0.26 0.84 9040 922 0.4 0.92
6.0E-5 0.06 0.95 0.31 1.0 12426 1267 0.55 1.27
7.0E-5 0.07 1.11 0.36 1.17 16510 1684 0.73 1.69
8.0E-5 0.08 1.27 0.41 1.34 21038 2145 0.93 2.1
9.0E-5 0.09 1.43 0.46 1.51 25961 2647 1.15 2.6
1.0E-4 0.1 1.59 0.51 1.67 31228 3184 1.38 3.2
1.1E-4 0.11 1.74 0.56 1.84 36792 3752 1.63 3.8
1.2E-4 0.12 1.9 0.61 2.0 43785 4465 1.94 4.5
1.3E-4 0.13 2.1 0.66 2.2 49998 5098 2.2 5.1
1.4E-4 0.14 2.2 0.71 2.3 57986 5913 2.6 5.9
1.5E-4 0.15 2.4 0.77 2.5 64717 6599 2.9 6.6
1.6E-4 0.16 2.5 0.82 2.7 73633 7508 3.3 7.5
1.7E-4 0.17 2.7 0.87 2.8 83125 8476 3.7 8.5
1.8E-4 0.18 2.9 0.92 3.0 90529 9231 4.0 9.2
1.9E-4 0.19 3.0 0.97 3.2 100868 10285 4.5 10.3
2.0E-4 0.2 3.2 1.02 3.3 111765 11397 4.9 11.4

Nominal Pipe Size: 3/4"

  • Inside Diameter: 0.021 m (0.82 inches)
Steel Pipes Schedule 40 - Pressure Loss - 3/4"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
4.0E-5 0.04 0.63 0.115 0.38 1585 162 0.07 0.162
5.0E-5 0.05 0.79 0.144 0.47 2328 237 0.103 0.24
6.0E-5 0.06 0.95 0.173 0.57 3210 327 0.142 0.33
7.0E-5 0.07 1.11 0.2 0.66 4175 426 0.185 0.43
8.0E-5 0.08 1.27 0.23 0.76 5326 543 0.24 0.54
9.0E-5 0.09 1.43 0.26 0.85 6419 655 0.28 0.66
1.0E-4 0.1 1.59 0.29 0.95 7727 788 0.34 0.79
1.1E-4 0.11 1.74 0.32 1.04 9350 953 0.41 0.95
1.2E-4 0.12 1.9 0.35 1.14 10842 1106 0.48 1.11
1.3E-4 0.13 2.1 0.38 1.23 12389 1263 0.55 1.26
1.4E-4 0.14 2.2 0.4 1.33 14369 1465 0.64 1.47
1.5E-4 0.15 2.4 0.43 1.42 16049 1636 0.71 1.64
1.6E-4 0.16 2.5 0.46 1.52 18260 1862 0.81 1.86
1.7E-4 0.17 2.7 0.49 1.61 20041 2044 0.89 2.0
1.8E-4 0.18 2.9 0.52 1.7 22468 2291 0.99 2.3
1.9E-4 0.19 3.0 0.55 1.8 25034 2553 1.11 2.6
2.0E-4 0.2 3.2 0.58 1.89 26946 2748 1.19 2.8
3.0E-4 0.3 4.8 0.87 2.8 57062 5819 2.5 5.8
4.0E-4 0.4 6.3 1.15 3.8 98274 10021 4.3 10.0
5.0E-4 0.5 7.9 1.44 4.7 148599 15153 6.6 15.2

Nominal Pipe Size: 1"

  • Inside Diameter: 0.027 m (1.05 inches)
Steel Pipes Schedule 40 - Pressure Loss - 1"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
7.0E-5 0.07 1.11 0.122 0.4 1243 127 0.055 0.127
8.0E-5 0.08 1.27 0.14 0.46 1588 162 0.07 0.162
9.0E-5 0.09 1.43 0.157 0.52 1919 196 0.085 0.196
1.0E-4 0.1 1.59 0.175 0.57 2312 236 0.102 0.24
1.1E-4 0.11 1.74 0.192 0.63 2729 278 0.121 0.28
1.2E-4 0.12 1.9 0.21 0.69 3248 331 0.144 0.33
1.3E-4 0.13 2.1 0.23 0.74 3717 379 0.164 0.38
1.4E-4 0.14 2.2 0.24 0.8 4200 428 0.186 0.43
1.5E-4 0.15 2.4 0.26 0.86 4822 492 0.21 0.49
1.6E-4 0.16 2.5 0.28 0.92 5342 545 0.24 0.55
1.7E-4 0.17 2.7 0.3 0.97 6030 615 0.27 0.62
1.8E-4 0.18 2.9 0.31 1.03 6578 671 0.29 0.67
1.9E-4 0.19 3.0 0.33 1.09 7329 747 0.32 0.75
2.0E-4 0.2 3.2 0.35 1.15 7895 805 0.35 0.81
3.0E-4 0.3 4.8 0.52 1.72 16749 1708 0.74 1.71
4.0E-4 0.4 6.3 0.7 2.3 27971 2852 1.24 2.9
5.0E-4 0.5 7.9 0.87 2.9 42295 4313 1.87 4.3
6.0E-4 0.6 9.5 1.05 3.4 58875 6004 2.6 6.0
7.0E-4 0.7 11.1 1.22 4.0 80136 8171 3.5 8.2
8.0E-4 0.8 12.7 1.4 4.6 101058 10305 4.5 10.3
9.0E-4 0.9 14.3 1.57 5.2 127901 13042 5.7 13.1
0.0010 1.0 15.9 1.75 5.7 152264 15526 6.7 15.5
0.0011 1.1 17.4 1.92 6.3 184239 18787 8.1 18.8

Nominal Pipe Size: 1 1/4"

  • Inside Diameter: 0.032 m (1.28 inches)
Steel Pipes Schedule 40 - Pressure Loss - 1 1/4"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
1.0E-4 0.1 1.59 0.124 0.41 1037 106 0.046 0.106
1.1E-4 0.11 1.74 0.137 0.45 1226 125 0.054 0.125
1.2E-4 0.12 1.9 0.149 0.49 1424 145 0.063 0.145
1.3E-4 0.13 2.1 0.162 0.53 1630 166 0.072 0.166
1.4E-4 0.14 2.2 0.174 0.57 1843 188 0.081 0.188
1.5E-4 0.15 2.4 0.187 0.61 2116 216 0.094 0.22
1.6E-4 0.16 2.5 0.199 0.65 2346 239 0.104 0.24
1.7E-4 0.17 2.7 0.21 0.69 2648 270 0.117 0.27
1.8E-4 0.18 2.9 0.22 0.73 2891 295 0.128 0.3
1.9E-4 0.19 3.0 0.24 0.78 3221 328 0.142 0.33
2.0E-4 0.2 3.2 0.25 0.82 3473 354 0.153 0.35
3.0E-4 0.3 4.8 0.37 1.22 7162 730 0.32 0.73
4.0E-4 0.4 6.3 0.5 1.63 11961 1220 0.53 1.22
5.0E-4 0.5 7.9 0.62 2.0 18087 1844 0.8 1.85
6.0E-4 0.6 9.5 0.75 2.4 25177 2567 1.11 2.6
7.0E-4 0.7 11.1 0.87 2.9 34269 3494 1.51 3.5
8.0E-4 0.8 12.7 0.99 3.3 43215 4407 1.91 4.4
9.0E-4 0.9 14.3 1.12 3.7 54695 5577 2.4 5.6
0.0010 1.0 15.9 1.24 4.1 65113 6640 2.9 6.6
0.0011 1.1 17.4 1.37 4.5 78786 8034 3.5 8.0
0.0012 1.2 19.0 1.49 4.9 93762 9561 4.1 9.6
0.0013 1.3 21 1.62 5.3 105965 10805 4.7 10.8
0.0014 1.4 22 1.74 5.7 122894 12532 5.4 12.5
0.0015 1.5 24 1.87 6.1 141077 14386 6.2 14.4
0.0016 1.6 25 1.99 6.5 160515 16368 7.1 16.4
0.0017 1.7 27 2.1 6.9 181206 18478 8.0 18.5

Nominal Pipe Size: 1 1/2"

  • Inside Diameter: 0.041 m (1.61 inches)
Steel Pipes Schedule 40 - Pressure Loss - 1 1/2"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
2.0E-4 0.2 3.2 0.151 0.5 1062 108 0.047 0.108
3.0E-4 0.3 4.8 0.23 0.75 2200 224 0.097 0.22
4.0E-4 0.4 6.3 0.3 0.99 3688 376 0.163 0.38
5.0E-4 0.5 7.9 0.38 1.24 5413 552 0.24 0.55
6.0E-4 0.6 9.5 0.45 1.49 7543 769 0.33 0.77
7.0E-4 0.7 11.1 0.53 1.74 9925 1012 0.44 1.01
8.0E-4 0.8 12.7 0.61 1.99 12963 1322 0.57 1.32
9.0E-4 0.9 14.3 0.68 2.2 15841 1615 0.7 1.62
0.0010 1.0 15.9 0.76 2.5 19556 1994 0.86 2.0
0.0011 1.1 17.4 0.83 2.7 22818 2327 1.01 2.3
0.0012 1.2 19.0 0.91 3.0 27156 2769 1.2 2.8
0.0013 1.3 21 0.98 3.2 31870 3250 1.41 3.3
0.0014 1.4 22 1.06 3.5 35593 3629 1.57 3.6
0.0015 1.5 24 1.14 3.7 40859 4166 1.81 4.2
0.0016 1.6 25 1.21 4.0 46488 4740 2.1 4.7
0.0017 1.7 27 1.29 4.2 52481 5352 2.3 5.4
0.0018 1.8 29 1.36 4.5 56574 5769 2.5 5.8
0.0019 1.9 30 1.44 4.7 63035 6428 2.8 6.4
0.0020 2.0 32 1.51 5.0 69844 7122 3.1 7.1
0.0030 3.0 48 2.3 7.5 150864 15384 6.7 15.4

Nominal Pipe Size: 2"

  • Inside Diameter: 0.053 m (2.1 inches)
Steel Pipes Schedule 40 - Pressure Loss - 2"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
4.0E-4 0.4 6.3 0.181 0.59 1053 107 0.047 0.107
5.0E-4 0.5 7.9 0.23 0.74 1548 158 0.068 0.158
6.0E-4 0.6 9.5 0.27 0.89 2159 220 0.095 0.22
7.0E-4 0.7 11.1 0.32 1.04 2844 290 0.126 0.29
8.0E-4 0.8 12.7 0.36 1.19 3591 366 0.159 0.37
9.0E-4 0.9 14.3 0.41 1.34 4545 463 0.2 0.46
0.0010 1.0 15.9 0.45 1.49 5418 552 0.24 0.55
0.0011 1.1 17.4 0.5 1.64 6556 668 0.29 0.67
0.0012 1.2 19.0 0.54 1.78 7523 767 0.33 0.77
0.0013 1.3 21 0.59 1.93 8829 900 0.39 0.9
0.0014 1.4 22 0.63 2.1 10240 1044 0.45 1.05
0.0015 1.5 24 0.68 2.2 11320 1154 0.5 1.16
0.0016 1.6 25 0.73 2.4 12879 1313 0.57 1.31
0.0017 1.7 27 0.77 2.5 14539 1483 0.64 1.48
0.0018 1.8 29 0.82 2.7 16300 1662 0.72 1.66
0.0019 1.9 30 0.86 2.8 17463 1781 0.77 1.78
0.0020 2.0 32 0.91 3.0 19350 1973 0.86 1.98
0.0030 3.0 48 1.36 4.5 41795 4262 1.85 4.3
0.0040 4.0 63 1.81 5.9 71207 7261 3.1 7.3
0.0050 5.0 79 2.3 7.4 111260 11345 4.9 11.4
0.0060 6.0 95 2.7 8.9 153249 15627 6.8 15.6

Nominal Pipe Size: 2 1/2"

  • Inside Diameter: 0.063 m (2.5 inches)
Steel Pipes Schedule 40 - Pressure Loss - 2 1/2"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
7.0E-4 0.7 11.1 0.22 0.74 1239 126 0.055 0.126
8.0E-4 0.8 12.7 0.26 0.84 1565 160 0.069 0.16
9.0E-4 0.9 14.3 0.29 0.95 1915 195 0.085 0.195
0.0010 1.0 15.9 0.32 1.05 2365 241 0.105 0.24
0.0011 1.1 17.4 0.35 1.16 2762 282 0.122 0.28
0.0012 1.2 19.0 0.38 1.26 3288 335 0.145 0.34
0.0013 1.3 21 0.42 1.37 3720 379 0.164 0.38
0.0014 1.4 22 0.45 1.47 4315 440 0.191 0.44
0.0015 1.5 24 0.48 1.58 4953 505 0.22 0.51
0.0016 1.6 25 0.51 1.68 5427 553 0.24 0.55
0.0017 1.7 27 0.55 1.79 6127 625 0.27 0.63
0.0018 1.8 29 0.58 1.89 6869 700 0.3 0.7
0.0019 1.9 30 0.61 2.0 7653 780 0.34 0.78
0.0020 2.0 32 0.64 2.1 8480 865 0.37 0.87
0.0030 3.0 48 0.96 3.2 17612 1796 0.78 1.8
0.0040 4.0 63 1.28 4.2 30005 3060 1.33 3.1
0.0050 5.0 79 1.6 5.3 46883 4781 2.1 4.8
0.0060 6.0 95 1.92 6.3 64576 6585 2.9 6.6
0.0070 7.0 111 2.2 7.4 87896 8963 3.9 9.0
0.0080 8.0 127 2.6 8.4 114802 11706 5.1 11.7
0.0090 9.0 143 2.9 9.5 138692 14142 6.1 14.2
0.01 10.0 159 3.2 10.5 171225 17460 7.6 17.5

Nominal Pipe Size: 3"

  • Inside Diameter: 0.078 m (3.1 inches)
Steel Pipes Schedule 40 - Pressure Loss - 3"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.0012 1.2 19.0 0.25 0.82 1170 119 0.052 0.119
0.0013 1.3 21 0.27 0.89 1326 135 0.059 0.135
0.0014 1.4 22 0.29 0.96 1538 157 0.068 0.157
0.0015 1.5 24 0.31 1.03 1766 180 0.078 0.18
0.0016 1.6 25 0.33 1.1 1937 198 0.086 0.198
0.0017 1.7 27 0.36 1.17 2187 223 0.097 0.22
0.0018 1.8 29 0.38 1.24 2452 250 0.108 0.25
0.0019 1.9 30 0.4 1.3 2631 268 0.116 0.27
0.0020 2.0 32 0.42 1.37 2915 297 0.129 0.3
0.0030 3.0 48 0.63 2.1 6054 617 0.27 0.62
0.0040 4.0 63 0.84 2.7 10314 1052 0.46 1.05
0.0050 5.0 79 1.05 3.4 16116 1643 0.71 1.64
0.0060 6.0 95 1.26 4.1 22197 2263 0.98 2.3
0.0070 7.0 111 1.46 4.8 30213 3081 1.34 3.1
0.0080 8.0 127 1.67 5.5 39462 4024 1.74 4.0
0.0090 9.0 143 1.88 6.2 47674 4861 2.1 4.9
0.01 10.0 159 2.1 6.9 58857 6002 2.6 6.0
0.011 11.0 174 2.3 7.6 71217 7262 3.1 7.3
0.012 12.0 190 2.5 8.2 84754 8642 3.7 8.7
0.013 13.0 206 2.7 8.9 99468 10143 4.4 10.2
0.014 14.0 222 2.9 9.6 115360 11763 5.1 11.8
0.015 15.0 238 3.1 10.3 126122 12861 5.6 12.9
0.016 16.0 254 3.3 11.0 143499 14633 6.3 14.6
0.017 17.0 269 3.6 11.7 161997 16519 7.2 16.5
0.018 18.0 285 3.8 12.4 181616 18519 8.0 18.5

Nominal Pipe Size: 3 1/2"

  • Inside Diameter: 0.09 m (3.548 inches)
Steel Pipes Schedule 40 - Pressure Loss - 3 1/2"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.0020 2 32 0.41 1.35 2908 296 0.13 0.30
0.0030 3 48 0.62 2.02 6162 627 0.27 0.63
0.0040 4 63 0.82 2.69 10498 1069 0.46 1.07
0.0050 5 79 1.03 3.37 15870 1616 0.70 1.62
0.0060 6 95 1.23 4.04 22245 2265 0.98 2.27
0.0070 7 111 1.44 4.72 29595 3013 1.31 3.02
0.0080 8 127 1.64 5.39 37898 3858 1.68 3.87
0.0090 9 143 1.85 6.06 47135 4799 2.08 4.81
0.010 10 159 2.05 6.74 57292 5833 2.53 5.85
0.011 11 174 2.26 7.41 68352 6959 3.02 6.98
0.012 12 190 2.46 8.08 80303 8176 3.55 8.20
0.013 13 206 2.67 8.76 93135 9482 4.12 9.51
0.014 14 222 2.88 9.43 106836 10877 4.72 10.91
0.015 15 238 3.08 10.10 121398 12359 5.37 12.40
0.016 16 254 3.29 10.78 136811 13928 6.05 13.97
0.017 17 269 3.49 11.45 153067 15584 6.77 15.63
0.018 18 285 3.70 12.12 170159 17324 7.52 17.37
0.019 19 301 3.90 12.80 188080 19148 8.32 19.20
0.020 20 317 4.11 13.47 206822 21056 9.14 21.12
0.030 30 476 6.16 20.21 438247 44617 19.38 44.75

Nominal Pipe Size: 4"

  • Inside Diameter: 0.102 m (4.0 inches)

For full table with Pressure Drops - rotate the screen!

Steel Pipes Schedule 40 - Pressure Loss - 4"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.0030 3.0 48 0.37 1.2 1649 168 0.073 0.168
0.0040 4.0 63 0.49 1.61 2814 287 0.124 0.29
0.0050 5.0 79 0.61 2.0 4214 430 0.186 0.43
0.0060 6.0 95 0.73 2.4 5805 592 0.26 0.59
0.0070 7.0 111 0.86 2.8 7901 806 0.35 0.81
0.0080 8.0 127 0.98 3.2 10319 1052 0.46 1.05
0.0090 9.0 143 1.1 3.6 12467 1271 0.55 1.27
0.01 10.0 159 1.22 4.0 15391 1569 0.68 1.57
0.011 11.0 174 1.35 4.4 18623 1899 0.82 1.9
0.012 12.0 190 1.47 4.8 22163 2260 0.98 2.3
0.013 13.0 206 1.59 5.2 24772 2526 1.09 2.5
0.014 14.0 222 1.71 5.6 28730 2930 1.27 2.9
0.015 15.0 238 1.84 6.0 32981 3363 1.46 3.4
0.016 16.0 254 1.96 6.4 37525 3826 1.66 3.8
0.017 17.0 269 2.1 6.8 42362 4320 1.87 4.3
0.018 18.0 285 2.2 7.2 47493 4843 2.1 4.8
0.019 19.0 301 2.3 7.6 52916 5396 2.3 5.4
0.02 20 317 2.4 8.0 58633 5979 2.6 6.0
0.03 30 476 3.7 12.0 125328 12780 5.5 12.8

Nominal Pipe Size: 5"

  • Inside Diameter: 0.128 m (5.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 5"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.0050 5.0 79 0.39 1.27 1413 144 0.062 0.144
0.0060 6.0 95 0.47 1.53 1950 199 0.086 0.199
0.0070 7.0 111 0.54 1.78 2539 259 0.112 0.26
0.0080 8.0 127 0.62 2.0 3316 338 0.147 0.34
0.0090 9.0 143 0.7 2.3 4197 428 0.185 0.43
0.01 10.0 159 0.78 2.5 4946 504 0.22 0.5
0.011 11.0 174 0.85 2.8 5984 610 0.26 0.61
0.012 12.0 190 0.93 3.1 7122 726 0.31 0.73
0.013 13.0 206 1.01 3.3 8358 852 0.37 0.85
0.014 14.0 222 1.09 3.6 9232 941 0.41 0.94
0.015 15.0 238 1.17 3.8 10598 1081 0.47 1.08
0.016 16.0 254 1.24 4.1 12058 1230 0.53 1.23
0.017 17.0 269 1.32 4.3 13612 1388 0.6 1.39
0.018 18.0 285 1.4 4.6 15261 1556 0.67 1.56
0.019 19.0 301 1.48 4.8 17004 1734 0.75 1.74
0.02 20 317 1.55 5.1 18840 1921 0.83 1.92
0.03 30 476 2.3 7.6 40271 4106 1.78 4.1
0.04 40 634 3.1 10.2 67826 6916 3.0 6.9
0.05 50 793 3.9 12.7 105978 10807 4.7 10.8
0.06 60 951 4.7 15.3 152608 15561 6.7 15.6

Nominal Pipe Size: 6"

  • Inside Diameter: 0.154 m (6.1 inches)
Steel Pipes Schedule 40 - Pressure Loss - 6"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.0070 7.0 111 0.38 1.23 1053 107 0.047 0.107
0.0080 8.0 127 0.43 1.41 1315 134 0.058 0.134
0.0090 9.0 143 0.48 1.59 1665 170 0.074 0.17
0.01 10.0 159 0.54 1.76 2055 210 0.091 0.21
0.011 11.0 174 0.59 1.94 2374 242 0.105 0.24
0.012 12.0 190 0.64 2.1 2825 288 0.125 0.29
0.013 13.0 206 0.7 2.3 3316 338 0.147 0.34
0.014 14.0 222 0.75 2.5 3845 392 0.17 0.39
0.015 15.0 238 0.81 2.6 4204 429 0.186 0.43
0.016 16.0 254 0.86 2.8 4783 488 0.21 0.49
0.017 17.0 269 0.91 3.0 5400 551 0.24 0.55
0.018 18.0 285 0.97 3.2 6054 617 0.27 0.62
0.019 19.0 301 1.02 3.3 6745 688 0.3 0.69
0.02 20 317 1.07 3.5 7474 762 0.33 0.76
0.03 30 476 1.61 5.3 15975 1629 0.71 1.63
0.04 40 634 2.1 7.0 26905 2744 1.19 2.7
0.05 50 793 2.7 8.8 42040 4287 1.86 4.3
0.06 60 951 3.2 10.6 60537 6173 2.7 6.2
0.07 70 1110 3.8 12.3 82398 8402 3.6 8.4
0.08 80 1268 4.3 14.1 101643 10365 4.5 10.4
0.09 90 1427 4.8 15.9 128642 13118 5.7 13.1
0.1 100 1585 5.4 17.6 158817 16195 7.0 16.2
0.11 110 1744 5.9 19.4 192168 19595 8.5 19.6

Nominal Pipe Size: 8"

  • Inside Diameter: 0.2 m (8.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 8"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.014 14.0 222 0.45 1.46 1041 106 0.046 0.106
0.015 15.0 238 0.48 1.57 1195 122 0.053 0.122
0.016 16.0 254 0.51 1.67 1359 139 0.06 0.139
0.017 17.0 269 0.54 1.78 1462 149 0.065 0.149
0.018 18.0 285 0.57 1.88 1639 167 0.072 0.167
0.019 19.0 301 0.6 1.98 1826 186 0.081 0.186
0.02 20 317 0.64 2.1 2023 206 0.089 0.21
0.03 30 476 0.95 3.1 4324 441 0.191 0.44
0.04 40 634 1.27 4.2 7283 743 0.32 0.74
0.05 50 793 1.59 5.2 11379 1160 0.5 1.16
0.06 60 951 1.91 6.3 16386 1671 0.72 1.67
0.07 70 1110 2.2 7.3 21064 2148 0.93 2.2
0.08 80 1268 2.5 8.4 27513 2805 1.22 2.8
0.09 90 1427 2.9 9.4 34821 3551 1.54 3.6
0.1 100 1585 3.2 10.4 42988 4384 1.9 4.4
0.11 110 1744 3.5 11.5 52016 5304 2.3 5.3
0.12 120 1902 3.8 12.5 61903 6312 2.7 6.3
0.13 130 2061 4.1 13.6 72650 7408 3.2 7.4
0.14 140 2219 4.5 14.6 84257 8592 3.7 8.6
0.15 150 2378 4.8 15.7 91034 9283 4.0 9.3
0.16 160 2536 5.1 16.7 103577 10562 4.6 10.6
0.17 170 2695 5.4 17.8 116928 11923 5.2 11.9
0.18 180 2853 5.7 18.8 131089 13367 5.8 13.4
0.19 190 3012 6.0 19.8 146059 14894 6.5 14.9
0.2 200 3170 6.4 21 161838 16503 7.2 16.5

A diagram presentation of the tables above can be found in "Steel Pipe Schedule 40 - Friction loss and Velocity Diagram".

Nominal Pipe Size: 10" 

  • Inside Diameter: 0.25 m (10.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 10"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.014 14.2 225 0.28 0.91 300 31 0.01 0.03
0.015 15.0 238 0.30 0.97 300 31 0.01 0.03
0.016 15.8 251 0.31 1.0 400 41 0.02 0.04
0.017 16.7 264 0.33 1.1 400 41 0.02 0.04
0.018 18.3 291 0.36 1.2 500 51 0.02 0.05
0.020 20.0 317 0.39 1.3 600 61 0.03 0.06
0.022 21.7 344 0.43 1.4 700 71 0.03 0.07
0.023 23.3 369 0.46 1.5 800 82 0.04 0.08
0.025 25.0 396 0.49 1.6 900 92 0.04 0.09
0.027 26.7 423 0.52 1.7 1000 102 0.04 0.10
0.028 28.3 449 0.56 1.8 1100 112 0.05 0.11
0.030 30.0 476 0.59 1.9 1200 122 0.05 0.12
0.032 31.7 502 0.62 2.0 1400 143 0.06 0.14
0.033 33.3 528 0.66 2.1 1500 153 0.07 0.15
0.037 36.7 581 0.72 2.4 1800 184 0.08 0.18
0.040 40.0 634 0.79 2.6 2100 214 0.09 0.21
0.043 43.3 687 0.85 2.8 2400 245 0.11 0.25
0.047 46.7 740 0.92 3.0 2800 286 0.12 0.29
0.050 50.0 793 0.98 3.2 3200 326 0.14 0.33
0.058 58.3 924 1.1 3.8 4200 428 0.19 0.43
0.067 66.7 1057 1.3 4.3 5400 551 0.24 0.55
0.075 75.0 1189 1.5 4.8 6800 693 0.30 0.69
0.083 83.3 1320 1.6 5.4 8300 846 0.37 0.85
0.10 100 1585 2.0 6.4 11700 1193 0.52 1.2
0.12 117 1850 2.3 7.5 15700 1601 0.69 1.6
0.13 133 2113 2.6 8.6 20300 2070 0.90 2.1
0.15 150 2378 2.9 9.7 25500 2600 1.1 2.6
0.17 167 2643 3.3 10.7 31200 3181 1.4 3.2
0.20 200 3170 3.9 12.9 44400 4527 2.0 4.5
0.23 233 3698 4.6 15.0 59900 6108 2.6 6.1
0.27 267 4228 5.2 17.2 77600 7913 3.4 7.9
0.30 300 4756 5.9 19.3 97600 9952 4.3 10.0
0.33 333 5283 6.6 21.5 119900 12226 5.3 12.2
0.42 417 6606 8.2 26.9 185600 18926 8.2 19.0
0.50 500 7926 9.8 32.2 265500 27073 11.7 27.1
0.58 583 9246 11.5 37.6 359600 36668 15.9 36.7
0.67 667 10569 13.1 43.0 467900 47712 20.7 47.8
0.75 750 11889 14.7 48.3 590400 60203 26.1 60.3
0.83 833 13209 16.4 53.7 727000 74132 32.1 74.3

Nominal Pipe Size: 12"

  • Inside Diameter: 0.300 m (12.0 inches)

For full table with Pressure Drops - rotate the screen!

Steel Pipes Schedule 40 - Pressure Loss 12"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.02 20.0 317 0.28 0.91 200 20.4 0.009 0.02
0.02 21.7 344 0.30 0.98 300 30.6 0.01 0.03
0.02 23.3 370 0.32 1.1 300 30.6 0.01 0.03
0.03 25.0 396 0.35 1.1 400 40.8 0.02 0.04
0.03 26.7 423 0.37 1.2 400 40.8 0.02 0.04
0.03 28.3 449 0.39 1.3 500 51.0 0.02 0.05
0.03 30.0 476 0.42 1.4 500 51.0 0.02 0.05
0.03 31.7 502 0.44 1.4 600 61.2 0.03 0.06
0.03 33.3 528 0.46 1.5 600 61.2 0.03 0.06
0.04 36.7 581 0.51 1.7 800 81.6 0.04 0.08
0.04 40.0 634 0.55 1.8 900 91.8 0.04 0.09
0.04 43.3 687 0.60 2.0 1000 102 0.04 0.10
0.05 46.7 740 0.65 2.1 1200 122 0.05 0.12
0.05 50.0 793 0.69 2.3 1300 133 0.06 0.13
0.06 58.3 925 0.81 2.6 1800 184 0.08 0.18
0.07 66.7 1057 0.92 3.0 2300 235 0.10 0.23
0.08 75.0 1189 1.0 3.4 2800 286 0.12 0.29
0.08 83.3 1321 1.2 3.8 3500 357 0.15 0.36
0.10 100 1585 1.4 4.5 4900 500 0.22 0.50
0.12 117 1850 1.6 5.3 6500 663 0.29 0.66
0.13 133 2108 1.8 6.1 8400 857 0.37 0.86
0.15 150 2378 2.1 6.8 10500 1071 0.46 1.1
0.17 167 2643 2.3 7.6 12900 1315 0.57 1.3
0.20 200 3170 2.8 9.1 18300 1866 0.81 1.9
0.23 233 3698 3.2 10.6 24600 2508 1.1 2.5
0.27 267 4228 3.7 12.1 31800 3243 1.4 3.2
0.30 300 4756 4.2 13.6 40000 4079 1.8 4.1
0.33 333 5283 4.6 15.1 49000 4997 2.2 5.0
0.42 417 6606 5.8 18.9 75700 7719 3.3 7.7
0.50 500 7926 6.9 22.7 108100 11023 4.8 11.0
0.58 583 9246 8.1 26.5 149200 15214 6.6 15.2
0.67 667 10569 9.2 30.3 190000 19374 8.4 19.4
0.75 750 11889 10.4 34.0 239500 24422 10.6 24.5
0.83 833 13205 11.5 37.8 294700 30051 13.0 30.1
0.92 917 14532 12.7 41.6 355600 36261 15.7 36.3
1.00 1000 15852 13.8 45.4 422200 43052 18.7 43.1
1.08 1083 17172 15.0 49.2 494500 50424 21.9 50.5

Nominal Pipe Size: 14"

  • Inside Diameter: 0.350 m (14.0 inches)
Steel Pipes Schedule 40 - Pressure Loss 14"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.03 30.0 476 0.34 1.1 300 31 0.013 0.03
0.03 31.7 502 0.36 1.2 400 41 0.018 0.04
0.03 33.3 528 0.38 1.3 400 41 0.018 0.04
0.04 36.7 581 0.42 1.4 500 51 0.022 0.05
0.04 40.0 634 0.46 1.5 600 61 0.027 0.06
0.04 43.3 687 0.50 1.6 600 61 0.027 0.06
0.05 46.7 740 0.54 1.8 700 71 0.031 0.07
0.05 50.0 793 0.57 1.9 800 82 0.035 0.08
0.06 58.3 925 0.67 2.2 1100 112 0.049 0.11
0.07 66.7 1057 0.76 2.5 1400 143 0.062 0.14
0.08 75.0 1189 0.86 2.8 1800 184 0.080 0.18
0.08 83.3 1321 0.96 3.1 2200 224 0.097 0.22
0.10 100 1585 1.1 3.8 3100 316 0.14 0.32
0.12 117 1850 1.3 4.4 4100 418 0.18 0.42
0.13 133 2108 1.5 5.0 5300 540 0.23 0.54
0.15 150 2378 1.7 5.6 6600 673 0.29 0.67
0.17 167 2643 1.9 6.3 8000 816 0.35 0.82
0.20 200 3170 2.3 7.5 11400 1162 0.50 1.2
0.23 233 3698 2.7 8.8 15300 1560 0.68 1.6
0.27 267 4228 3.1 10.0 19200 1958 0.85 2.0
0.30 300 4756 3.4 11.3 24800 2529 1.1 2.5
0.33 333 5283 3.8 12.5 30400 3100 1.3 3.1
0.42 417 6606 4.8 15.7 46800 4772 2.1 4.8
0.50 500 7926 5.7 18.8 66800 6812 3.0 6.8
0.58 583 9246 6.7 21.9 90300 9208 4.0 9.2
0.67 667 10569 7.6 25.1 117200 11951 5.2 12.0
0.75 750 11889 8.6 28.2 147700 15061 6.5 15.1
0.83 833 13205 9.6 31.3 181600 18518 8.0 18.5
0.92 917 14532 10.5 34.5 219100 22342 9.7 22.4
1.0 1000 15852 11.5 37.6 260000 26512 11.5 26.6
1.1 1083 17172 12.4 40.7 304400 31040 13.5 31.1
1.2 1167 18495 13.4 43.9 352300 35924 15.6 36.0
1.3 1250 19815 14.3 47.0 403700 41165 17.8 41.2
1.3 1333 21135 15.3 50.1 458600 46763 20.3 46.8

Nominal Pipe Size: 16"

  • Inside Diameter: 0.400 m (16.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 16"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.05 50.0 793 0.44 1.4 400 41 0.018 0.04
0.06 58.3 925 0.51 1.7 600 61 0.027 0.06
0.07 66.7 1057 0.59 1.9 700 71 0.031 0.07
0.08 75.0 1189 0.66 2.2 900 92 0.040 0.09
0.08 83.3 1321 0.73 2.4 1100 112 0.049 0.11
0.10 100 1585 0.9 2.9 1600 163 0.07 0.16
0.12 117 1850 1.0 3.4 2100 214 0.09 0.21
0.13 133 2108 1.2 3.8 2700 275 0.12 0.28
0.15 150 2378 1.3 4.3 3400 347 0.15 0.35
0.17 167 2643 1.5 4.8 4100 418 0.18 0.42
0.20 200 3170 1.8 5.8 5800 591 0.26 0.6
0.23 233 3698 2.0 6.7 7800 795 0.34 0.8
0.27 267 4228 2.3 7.7 10100 1030 0.45 1.0
0.30 300 4756 2.6 8.6 12600 1285 0.6 1.3
0.33 333 5283 2.9 9.6 15400 1570 0.7 1.6
0.42 417 6606 3.7 12.0 23800 2427 1.1 2.4
0.50 500 7926 4.4 14.4 33800 3447 1.5 3.5
0.58 583 9246 5.1 16.8 45600 4650 2.0 4.7
0.67 667 10569 5.8 19.2 59200 6037 2.6 6.0
0.75 750 11889 6.6 21.6 74500 7597 3.3 7.6
0.83 833 13205 7.3 24.0 91600 9340 4.0 9.4
0.92 917 14532 8.0 26.4 110400 11257 4.9 11.3
1.0 1000 15852 8.8 28.8 130900 13348 5.8 13.4
1.1 1083 17172 9.5 31.2 153200 15622 6.8 15.6
1.2 1167 18495 10.2 33.6 177300 18079 7.8 18.1
1.3 1250 19815 11.0 35.9 203000 20700 9.0 20.7
1.3 1333 21135 11.7 38.3 230600 23514 10.2 23.6

Nominal Pipe Size: 18"

  • Inside Diameter: 0.450 m (18.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 18"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.10 100 1585 0.7 2.3 900 92 0.04 0.09
0.12 117 1850 0.8 2.7 1200 122 0.05 0.12
0.13 133 2108 0.9 3.0 1500 153 0.07 0.15
0.15 150 2378 1.0 3.4 1500 153 0.07 0.15
0.17 167 2643 1.2 3.8 2300 235 0.10 0.23
0.20 200 3170 1.4 4.5 3200 326 0.14 0.3
0.23 233 3698 1.6 5.3 4300 438 0.19 0.4
0.27 267 4228 1.8 6.1 5600 571 0.25 0.6
0.30 300 4756 2.1 6.8 7000 714 0.3 0.7
0.33 333 5283 2.3 7.6 8500 867 0.4 0.9
0.42 417 6606 2.9 9.5 13100 1336 0.6 1.3
0.50 500 7926 3.5 11.4 18600 1897 0.8 1.9
0.58 583 9246 4.0 13.3 25100 2559 1.1 2.6
0.67 667 10569 4.6 15.1 32500 3314 1.4 3.3
0.75 750 11889 5.2 17.0 40900 4171 1.8 4.2
0.83 833 13205 5.8 18.9 50200 5119 2.2 5.1
0.92 917 14532 6.4 20.8 60400 6159 2.7 6.2
1.00 1000 15852 6.9 22.7 71600 7301 3.2 7.3
1.08 1083 17172 7.5 24.6 83800 8545 3.7 8.6
1.17 1167 18495 8.1 26.5 96900 9881 4.3 9.9
1.25 1250 19815 8.7 28.4 110900 11308 4.9 11.3
1.33 1333 21135 9.2 30.3 125900 12838 5.6 12.9

Nominal Pipe Size: 20"

  • Inside Diameter: 0.500 m (20.0 inches)

For full table with Pressure Drops - rotate the screen!

Steel Pipes Schedule 40 - Pressure Loss - 20"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.17 167 2643 0.9 3.1 1300 133 0.06 0.13
0.20 200 3170 1.1 3.7 1900 194 0.08 0.2
0.23 233 3698 1.3 4.3 2500 255 0.11 0.3
0.27 267 4228 1.5 4.9 3200 326 0.14 0.3
0.30 300 4756 1.7 5.5 4100 418 0.2 0.4
0.33 333 5283 1.9 6.1 5000 510 0.2 0.5
0.42 417 6606 2.3 7.6 7600 775 0.3 0.8
0.50 500 7926 2.8 9.1 10800 1101 0.5 1.1
0.58 583 9246 3.3 10.7 14500 1479 0.6 1.5
0.67 667 10569 3.7 12.2 18700 1907 0.8 1.9
0.75 750 11889 4.2 13.7 23600 2406 1.0 2.4
0.83 833 13205 4.6 15.2 28900 2947 1.3 3.0
0.92 917 14532 5.1 16.8 34800 3549 1.5 3.6
1.00 1000 15852 5.6 18.3 41200 4201 1.8 4.2
1.08 1083 17172 6.0 19.8 48200 4915 2.1 4.9
1.17 1167 18495 6.5 21.3 55700 5680 2.5 5.7
1.25 1250 19815 7.0 22.9 63700 6495 2.8 6.5
1.33 1333 21135 7.4 24.4 72300 7372 3.2 7.4

Nominal Pipe Size: 24"

  • Inside Diameter: 0.600 m (24.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 24"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.30 300 4756 1.1 3.7 1600 163 0.1 0.2
0.33 333 5283 1.3 4.2 2000 204 0.1 0.2
0.42 417 6606 1.6 5.3 3000 306 0.1 0.3
0.50 500 7926 1.9 6.3 4300 438 0.2 0.4
0.58 583 9246 2.2 7.4 5700 581 0.3 0.6
0.67 667 10569 2.6 8.4 7400 755 0.3 0.8
0.75 750 11889 2.9 9.5 9300 948 0.4 0.9
0.83 833 13205 3.2 10.5 11400 1162 0.5 1.2
0.92 917 14532 3.5 11.6 13700 1397 0.6 1.4
1.00 1000 15852 3.9 12.6 16200 1652 0.7 1.7
1.08 1083 17172 4.2 13.7 18900 1927 0.8 1.9
1.17 1167 18495 4.5 14.8 21800 2223 1.0 2.2
1.25 1250 19815 4.8 15.8 24900 2539 1.1 2.5
1.33 1333 21135 5.1 16.9 28300 2886 1.3 2.9

Nominal Pipe Size: 32"

  • Inside Diameter: 0.800 m (32.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 32"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.50 500 7926 1.1 3.5 900 92 0.0 0.1
0.58 583 9246 1.2 4.0 1300 133 0.1 0.1
0.67 667 10569 1.4 4.6 1600 163 0.1 0.2
0.75 750 11889 1.6 5.2 2000 204 0.1 0.2
0.83 833 13205 1.8 5.8 2500 255 0.1 0.3
0.92 917 14532 1.9 6.3 3000 306 0.1 0.3
1.00 1000 15852 2.1 6.9 3500 357 0.2 0.4
1.08 1083 17172 2.3 7.5 4100 418 0.2 0.4
1.17 1167 18495 2.5 8.1 4700 479 0.2 0.5
1.25 1250 19815 2.6 8.6 5400 551 0.2 0.6
1.33 1333 21135 2.8 9.2 6100 622 0.3 0.6

Nominal Pipe Size: 36"

  • Inside Diameter: 0.900 m (36.0 inches)
Steel Pipes Schedule 40 - Pressure Loss - 36"
Flow Velocity Pressure Drop
(m3/s) (liter/s) (US gpm) (m/s) (ft/s) (Pa/100m) (mmH2O/100m) (psi/100ft) (ftH2O/100ft)
0.75 750 11889 1.2 4.1 1100 112 0.0 0.1
0.83 833 13205 1.4 4.5 1400 143 0.1 0.1
0.92 917 14532 1.5 5.0 1600 163 0.1 0.2
1.00 1000 15852 1.7 5.4 1900 194 0.1 0.2
1.08 1083 17172 1.8 5.9 2300 235 0.1 0.2
1.17 1167 18495 1.9 6.3 2600 265 0.1 0.3
1.25 1250 19815 2.1 6.8 3000 306 0.1 0.3
1.33 1333 21135 2.2 7.3 3400 347 0.2 0.3
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