朱宏举 | 以下三项，填入两项，求另一项 | |
| 流量 | m3/h |
| 流速 | m/s |
| 管径 | mm |
| 管道截面积 | mm2 |
| 所需正方形管道尺寸 | mm |
| 公式：流量=管截面积×流速 Q=(π*DN*DN/1000000)/4*V*3600 其中：DN单位：mm 一般工程上计算时，水管路，压力常见为0.1～0.6MPa，水在水管中流速在1～3米/秒，常取1.5米/秒。 |
| 流量m3/h | 流速0.4m/s | 流速0.6m/s | 流速0.8m/s | 流速1.0m/s | 流速1.2m/s | 流速1.4m/s | 流速1.5m/s | 流速1.6m/s | 流速1.8m/s | 流速2.0m/s | 流速2.2m/s | 流速2.4m/s | 流速2.6m/s | 流速2.8m/s | 流速3.0m/s |
| DN 20 | 0.45 | 0.68 | 0.90 | 1.13 | 1.36 | 1.58 | 1.70 | 1.81 | 2.03 | 2.26 | 2.49 | 2.71 | 2.94 | 3.17 | 3.39 |
| DN 25 | 0.71 | 1.06 | 1.41 | 1.77 | 2.12 | 2.47 | 2.65 | 2.83 | 3.18 | 3.53 | 3.89 | 4.24 | 4.59 | 4.95 | 5.30 |
| DN 32 | 1.16 | 1.74 | 2.32 | 2.89 | 3.47 | 4.05 | 4.34 | 4.63 | 5.21 | 5.79 | 6.37 | 6.95 | 7.52 | 8.10 | 8.68 |
| DN 40 | 1.81 | 2.71 | 3.62 | 4.52 | 5.43 | 6.33 | 6.78 | 7.23 | 8.14 | 9.04 | 9.95 | 10.85 | 11.76 | 12.66 | 13.56 |
| DN 50 | 2.83 | 4.24 | 5.65 | 7.07 | 8.48 | 9.89 | 10.60 | 11.30 | 12.72 | 14.13 | 15.54 | 16.96 | 18.37 | 19.78 | 21.20 |
| DN 65 | 4.78 | 7.16 | 9.55 | 11.94 | 14.33 | 16.72 | 17.91 | 19.10 | 21.49 | 23.88 | 26.27 | 28.66 | 31.04 | 33.43 | 35.82 |
| DN 80 | 7.23 | 10.85 | 14.47 | 18.09 | 21.70 | 25.32 | 27.13 | 28.94 | 32.56 | 36.17 | 39.79 | 43.41 | 47.02 | 50.64 | 54.26 |
| DN 100 | 11.30 | 16.96 | 22.61 | 28.26 | 33.91 | 39.56 | 42.39 | 45.22 | 50.87 | 56.52 | 62.17 | 67.82 | 73.48 | 79.13 | 84.78 |
| DN 125 | 17.66 | 26.49 | 35.33 | 44.16 | 52.99 | 61.82 | 66.23 | 70.65 | 79.48 | 88.31 | 97.14 | 105.98 | 114.81 | 123.64 | 132.47 |
| DN 150 | 25.43 | 38.15 | 50.87 | 63.59 | 76.30 | 89.02 | 95.38 | 101.74 | 114.45 | 127.17 | 139.89 | 152.60 | 165.32 | 178.04 | 190.76 |
| DN 200 | 45.22 | 67.82 | 90.43 | 113.04 | 135.65 | 158.26 | 169.56 | 180.86 | 203.47 | 226.08 | 248.69 | 271.30 | 293.90 | 316.51 | 339.12 |
| DN 250 | 70.65 | 105.98 | 141.30 | 176.63 | 211.95 | 247.28 | 264.94 | 282.60 | 317.93 | 353.25 | 388.58 | 423.90 | 459.23 | 494.55 | 529.88 |
| DN 300 | 101.74 | 152.60 | 203.47 | 254.34 | 305.21 | 356.08 | 381.51 | 406.94 | 457.81 | 508.68 | 559.55 | 610.42 | 661.28 | 712.15 | 763.02 |
| DN 350 | 138.47 | 207.71 | 276.95 | 346.19 | 415.42 | 484.66 | 519.28 | 553.90 | 623.13 | 692.37 | 761.61 | 830.84 | 900.08 | 969.32 | 1038.56 |
| DN 400 | 180.86 | 271.30 | 361.73 | 452.16 | 542.59 | 633.02 | 678.24 | 723.46 | 813.89 | 904.32 | 994.75 | 1085.18 | 1175.62 | 1266.05 | 1356.48 |
| DN 450 | 228.91 | 343.36 | 457.81 | 572.27 | 686.72 | 801.17 | 858.40 | 915.62 | 1030.08 | 1144.53 | 1258.98 | 1373.44 | 1487.89 | 1602.34 | 1716.80 |
| DN 500 | 282.60 | 423.90 | 565.20 | 706.50 | 847.80 | 989.10 | 1059.75 | 1130.40 | 1271.70 | 1413.00 | 1554.30 | 1695.60 | 1836.90 | 1978.20 | 2119.50 |
| DN 600 | 406.94 | 610.42 | 813.89 | 1017.36 | 1220.83 | 1424.30 | 1526.04 | 1627.78 | 1831.25 | 2034.72 | 2238.19 | 2441.66 | 2645.14 | 2848.61 | 3052.08 |