减压孔板计算减压孔板孔径的计算：水流通过孔板时的水头损失，可按下式计算：（1）式中H--水流通过孔板的水头损失值（kPa）;10--单位换算值（）v--水流通过孔板后的流速（m/s）g--重力加速度ξ值可从下式求得：（2）式中D--给水管直径（mm）d--孔板的孔径（mm）为简化计算，将各种不同管径及孔板孔径代入式（1）中及（2）中，求的相应的H值，所得结果列入下表中。使用时，只要已知剩余水头H及给水管直径D，就可以从表中查得所需孔板孔径d。下表中数据是假定水流通过孔板后的流速为1（m/s）计算得出的，如实际流速与此不符，则应按下式进行修正，并按修正后的剩余水头查表：式中H'--流速1m/s时的剩余水头（kPa）；v--水流通过孔板后的实际流速（m/s）（如孔板前后管径无变化，则v值等于管内流速）；H--设计剩余水头（kPa）。D(mm)d(mm)4567891011121315245.594.942.520.911.05.93.31.80.90.420810.6321.8149.276.842.524.815.19.45.93.825810.6381.4199.9113.267.942.527.618.312.432560.3321.8196.2125.383.156.739.740810.6498.6321.8215.7149.2105.950810.6547.2381.4273.1D(mm)d(mm)141516171819202122232415202.41.50.90.5258.65.94.22.92.01.40.90.60.43228.320.515.111.28.46.34.83.62.72.01.54076.856.742.532.324.819.315.111.99.47.55.950199.9149.2113.287.167.953.542.534.127.622.418.370810.6610.1467.1363.1286.0227.9183.5149.2122.3101.084.080810.6631.5498.6398.4321.8262.3215.7178.8149.2100810.6663.1547.2455.2381.4D(mm)d(mm)252627282930313233321.10.80.6404.83.83.02.41.91.51.20.90.75015.112.410.38.67.15.95.04.23.57070.359.250.042.536.331.126.723.120.080125.3105.989.976.865.856.749.042.537.0100321.8273.1233.0199.9172.3149.2129.7113.299.1125810.6689.8590.3507.9439.2381.4332.7291.4256.1150810.6708.3621.4547.2D(mm)d(mm)343536373839404142400.50.40.3502.92.42.01.71.41.10.90.80.67017.315.113.111.510.08.87.76.85.98032.328.324.821.819.317.015.113.311.910087.176.867.960.253.547.642.538.034.1125225.9199.9177.5158.0141.0126.2113.2101.891.7150483.6428.8381.4340.3304.4273.1245.5221.3199.9D(mm)d(mm)434445464748495051500.50.4705.24.64.13.63.12.82.42.11.98010.59.48.47.56.75.95.34.84.210030.627.624.822.420.218.316.615.113.712582.874.967.961.656.051.046.642.538.9150181.0164.2149.2135.8123.9113.2103.694.987.1D(mm)d(mm)525354555657585960701.61.41.21.10.90.80.70.60.5803.83.43.02.72.42.21.91.71.510012.411.310.39.48.67.87.16.55.912535.632.730.027.625.323.321.519.818.315080.173.767.962.657.853.549.545.942.5D(mm)d(mm)616263646566676869700.40.30.30.2801.41.21.10.90.80.70.60.50.51005.45.04.54.23.83.53.22.92.712516.915.714.513.412.411.510.79.99.215039.536.734.131.729.627.625.724.022.4D(mm)d(mm)707172737475767778800.40.30.30.21002.42.22.01.81.71.51.41.31.11258.67.97.46.96.45.95.55.14.815020.919.618.317.216.115.114.113.212.4D(mm)d(mm)7980818283848586871001.00.90.80.80.70.60.50.50.41254.54.23.93.63.43.12.92.72.515011.711.010.39.79.18.68.07.67.1D(mm)d(mm)8889909192939495961000.40.30.30.21252.32.22.01.91.71.61.51.41.31506.76.35.95.65.35.04.74.44.2D(mm)d(mm)9798991001011021031041051251.21.11.00.90.90.80.70.70.61503.93.73.53.33.12.92.72.62.4D(mm)d(mm)1061071081091101111121131141250.50.50.40.40.40.30.30.21502.32.12.01.91.81.71.61.51.4D(mm)d(mm)1151161171181191201211221231501.31.21.11.11.00.90.90.80.8
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