孔板流量计K值表.docx

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1、标准孔板流量计流量系数（K值）规格（mm）25%开孔d=1/4×管道内径50%开孔使用75%d=3/4×管道内径K值最小流量最大流量K值最小流量最大流量K值最小流量最大流量Φ500.01820.05760.1820.06330.20020.6330.19790.62581.979Φ1000.07230.22860.7230.30010.9493.0010.78272.47517.827Φ1500.16210.51261.6210.67182.12446.7181.8146.736418.14Φ2000.2

2、870.90762.871.18793.756511.8793.207510.14332.075Φ2500.44721.41424.4721.85315.8618.5314.997615.803849.976Φ2750.54031.70865.4032.24067.085422.4065.836218.444358.362Φ3000.5422.03026.422.6648.424326.647.176122.692871.761Φ3250.75352.4157.5353.12689.887831.2688

3、.140125.741381.401Φ3500.87392.76358.7393.626311.467436.2639.440629.853894.406Φ3751.00323.172410.0324.162913.164241.62910.837434.2709108.374Φ4001.14143.609411.4144.736414.977847.36412.330638.9928123.306Φ4251.28854.074612.8855.34716.908753.4713.920144.01921

4、39.201Φ4501.44464.568214.4465.994518.956359.94515.605949.3502156.059Φ5001.78345.639617.8347.400623.402874.00619.266660.9263192.666Φ5502.1586.824221.588.954828.317689.54823.312573.726233.125Φ6002.56828.121425.68210.656933.7001106.56927.743987.7339277.439使用

5、范围特殊情况使用流速<2m/s低流速使用（2m/s<流速<10m/s）高流速使用流速>8m/s说明1、表中25%、50%和75%开孔，指孔板内孔是管道内径的百分数。2、表中25%开孔为瓦斯抽放特殊情况下使用（小流量）的规格。3、表中50%开孔为瓦斯抽放最低流速<管道气体流速：5m/s时的规格。4、表中75%开孔为瓦斯抽放量最高流速>管道气体流速：15m/s时的规格。5、表中最大和最小流量是P；100Kpa（抽放负压=0Kpa,T=20，C和瓦斯浓度为零。C%）时计算的。