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
The tables below indicates friction loss for water flow through
ASME/ANSI B36.10/19 schedule 40 steel pipe.
The pressure drop calculations are made with the D'Arcy-Weisbach Equation.
Nominal Pipe Size: 3/8"
- Inside Diameter: 0.0125 m (0.49 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-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)
| 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)
| 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)
| 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)
| 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)
| 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)
| 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)
| 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)
| 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: 0.096 m (3.8 inches)
| Flow |
Velocity |
Pressure Drop |
| (m3/s) |
(liter/s) |
(US gpm) |
(m/s) |
(ft/s) |
(Pa/100m) |
(mmH2O/100m) |
(psi/100ft) |
(ftH2O/100ft) |
| 0.0020 | 2.0 | 32 | 0.28 | 0.91 | 1072 | 109 | 0.047 | 0.109 |
| 0.0030 | 3.0 | 48 | 0.41 | 1.36 | 2233 | 228 | 0.099 | 0.23 |
| 0.0040 | 4.0 | 63 | 0.55 | 1.81 | 3811 | 389 | 0.168 | 0.39 |
| 0.0050 | 5.0 | 79 | 0.69 | 2.3 | 5706 | 582 | 0.25 | 0.58 |
| 0.0060 | 6.0 | 95 | 0.83 | 2.7 | 7860 | 801 | 0.35 | 0.8 |
| 0.0070 | 7.0 | 111 | 0.97 | 3.2 | 10698 | 1091 | 0.47 | 1.09 |
| 0.0080 | 8.0 | 127 | 1.11 | 3.6 | 13973 | 1425 | 0.62 | 1.43 |
| 0.0090 | 9.0 | 143 | 1.24 | 4.1 | 16881 | 1721 | 0.75 | 1.72 |
| 0.01 | 10.0 | 159 | 1.38 | 4.5 | 20841 | 2125 | 0.92 | 2.1 |
| 0.011 | 11.0 | 174 | 1.52 | 5.0 | 25217 | 2571 | 1.11 | 2.6 |
| 0.012 | 12.0 | 190 | 1.66 | 5.4 | 30011 | 3060 | 1.33 | 3.1 |
| 0.013 | 13.0 | 206 | 1.8 | 5.9 | 33544 | 3420 | 1.48 | 3.4 |
| 0.014 | 14.0 | 222 | 1.93 | 6.3 | 38903 | 3967 | 1.72 | 4.0 |
| 0.015 | 15.0 | 238 | 2.1 | 6.8 | 44659 | 4554 | 1.97 | 4.6 |
| 0.016 | 16.0 | 254 | 2.2 | 7.3 | 50812 | 5181 | 2.2 | 5.2 |
| 0.017 | 17.0 | 269 | 2.3 | 7.7 | 57362 | 5849 | 2.5 | 5.9 |
| 0.018 | 18.0 | 285 | 2.5 | 8.2 | 64309 | 6558 | 2.8 | 6.6 |
| 0.019 | 19.0 | 301 | 2.6 | 8.6 | 71653 | 7306 | 3.2 | 7.3 |
| 0.02 | 20 | 317 | 2.8 | 9.1 | 79394 | 8096 | 3.5 | 8.1 |
| 0.03 | 30 | 476 | 4.1 | 13.6 | 169704 | 17305 | 7.5 | 17.3 |
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) |
| 0.0030 | 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)
| 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)
| 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)
| 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".
© The Engineering ToolBox 2005
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