你这属于高压蒸汽，压力近42kgf,,温度400。管径150mm 发各表给你自己查吧

管径/流速/流量对照表

管径(DN)流量 m3/h

0.4m/s0.6m/s0.8m/s1.0m/s1.2m/s1.4m/s1.6m/s1.8m/s2.0m/s2.2m/s2.4m/s2.6m/s2.8m/s3.0m/s

200.50.70.91.11.41.61.82.02.32.52.72.93.23.4

250.71.11.41.82.12.52.83.23.53.94.24.64.95.3

321.21.72.32.93.54.14.65.25.86.46.97.58.18.7

401.82.73.64.55.46.37.28.19.010.010.911.812.713.6

502.84.25.77.18.59.911.312.714.115.617.018.419.821.2

654.87.29.611.914.316.719.121.523.926.328.731.133.435.8

807.210.914.518.121.725.329.032.636.239.843.447.050.754.3

10011.317.022.628.333.939.645.250.956.562.267.973.579.284.8

12517.726.535.344.253.061.970.779.588.497.2106.0114.9123.7132.5

15025.438.250.963.676.389.1101.8114.5127.2140.0152.7165.4178.1190.9

20045.267.990.5113.1135.7158.3181.0203.6226.2248.8271.4294.1316.7339.3

25070.7106.0141.4176.7212.1247.4282.7318.1353.4388.8424.1459.5494.8530.1

300101.8152.7203.6254.5305.4356.3407.1458.0508.9559.8610.7661.6712.5763.4

350138.5207.8277.1346.4415.6484.9554.2623.4692.7762.0831.3900.5969.81039.1

400181.0271.4361.9452.4542.9633.3723.8814.3904.8995.31085.71176.21266.71357.2

450229.0343.5458.0572.6687.1801.6916.11030.61145.11259.61374.11488.61603.21717.7

500282.7424.1565.5706.9848.2989.61131.01272.31413.71555.11696.51837.81979.22120.6

600407.1610.7814.31017.91221.41425.01628.61832.22035.72239.32442.92646.52850.03053.6

管径(DN)流速推荐值m/s:

20253240506580100125150200250300350400

闭式系统0.5-0.60.6-0.70.7-0.90.8-10.9-1.21.1-1.41.2-1.61.3-1.81.5-2.01.6-2.21.8-2.51.8-2.61.9-2.91.6-2.51.8-2.6

开式系统0.4-0.50.5-0.60.6-0.80.7-0.90.8-1.00.9-1.21.1-1.41.2-1.61.4-1.81.5-2.01.6-2.31.7-2.41.7-2.41.6-2.11.8-2.3