减压孔板快速计算书

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1、减压孔板在室内给排水工程中，减压孔板可用于消除给水龙头和消火栓前的剩余水头，以保证水系统均衡供水，达到节水、节能的目的。（1）减压孔板孔径的计算：水流通过孔板式的水头损失，按式中计算：1式式中H——水流通过孔板的水头损失值（104Pa）；——孔板的局部阻力系数；υ——水流通过孔板后的流速（m/s）；g——重力加速度（m/s）。值可从下列式中求得：=1.75D2d21.1-d2D21.175-d2D2-122式式中D——给水管道直径（mm）；d——孔板孔径（mm）。为简化计算，将各种不同管径及孔板孔径代入公式1式、2式，求得相应的H值，所

2、得计算结果列于表1.使用时，只要已知剩余水头H1及给水立管直径D，九可从表中查的所需孔板孔径d。表1：减压孔板的水头损失D（mm）d(mm)34567891011121315202532405081.03262.3024.5481.03201.779.4932.1681.03222.214.2514.9138.13105.59262.302.097.6819.9856.00140.021.104.2511.3132.1681.03201.770.592.486.7919.6149.84124.800.331.514.2512.5332.

3、1681.030.180.942.758.3021.5654.700.090.591.835.6714.9138.130.040.381.243.9610.5827.30D（mm）d(mm)1415161718192021222324202532405070800.240.862.837.6819.9881.03140.820.150.592.055.6714.9160.98105.590.090.421.514.5211.3146.6981.030.050.291.123.238.7136.3063.130.030.200.842.4

4、86.7928.5949.840.010.140.631.925.3422.7839.830.090.471.514.2518.3532.160.060.361.183.4114.9126.220.040.270.942.7512.2221.560.020.200.752.2410.1017.870.010.150.591.838.4014.91100201.77157.61124.80100.0281.0366.2854.7045.5038.13D（mm）d(mm)25262728293031323332405070801001251

5、500.110.471.517.0312.5332.1681.04170.850.080.381.245.9110.5827.3068.99145.600.060.301.035.008.9923.2959.07124.800.040.240.854.257.6019.9850.74107.540.020.190.713.636.5817.2343.8993.130.010.150.593.115.6714.9138.1481.030.120.502.674.9012.9733.2870.800.090.422.314.2511.312

6、9.1062.110.070.351.993.709.9125.5954.70D（mm）d(mm)343536373839404142405070801001251500.050.291.733.238.7122.5948.340.040.241.512.837.6820.0042.870.030.201.312.486.7917.7238.130.020.171.152.186.0115.7934.020.010.141.001.925.3414.1030.430.010.881.704.7612.6027.300.090.771.5

7、14.2511.3124.540.080.681.333.8010.1822.120.060.591.183.419.1619.90D（mm）d(mm)4344454647484950515070801001251500.050.521.053.068.2818.090.040.460.942.757.4916.410.030.400.842.486.7814.910.020.360.752.246.1513.580.010.310.672.025.5912.380.010.280.581.835.1011.310.240.531.66

8、4.6610.350.210.471.514.259.490.190.421.373.908.71D（mm）d(mm)52535455565758596070801001251500.160.381.243