喷淋泵选择计算书.doc

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1、喷淋泵选择计算书计算原理参照《自动喷水灭火系统设计规范GB50084-2001》基本计算公式1.喷头流量q=K*SQRT(10P)式中：q-喷头处节点流量，L/minP-喷头处水压，MPaK-喷头流量系数2.流速VV=(4*Q)/(π*Dj*Dj)式中：Q-管段流量L/sDj-管道的计算内径（m）3.水力坡降i=0.00107*V*V/(pow(Dj,1.3)式中：i-每米管道的水头损失（mH20/m）V-管道内水的平均流速（m/s）Dj-管道的计算内径（m）4.沿程水头损失h=i*L式中：L-管段长度m5.局部损失（采用当量长度法）h=i*L

2、(当量)式中：L(当量)管段当量长度，单位m(《自动喷水灭火系统设计规范》附录C)6.总损失h=h(局)+h(沿)7.终点压力Hn=Hn-1+hA侧喷淋计算表：管段名称起点压力mH2O管道流量L/s管长m当量长度管径mmK水力坡降mH2O/m流速m/s损失mH2O终点压力mH2O1-225.001.600.490.90321150.2391.680.3325.332-325.331.601.380.9032800.2391.680.5425.883-425.881.602.750.9032800.2391.680.8726.754-526.75

3、1.600.840.9032800.2391.680.4227.175-627.171.600.750.9032800.2391.680.3927.566-727.562.901.651.8032800.7873.052.7130.277-830.272.901.091.2032800.7873.051.8032.0812-830.412.132.731.20321150.4242.241.6732.088-932.085.022.642.7040801.1234.006.0038.0813-936.871.822.701.2032800.31

4、21.921.2238.089-1038.086.851.953.6050800.5193.222.8840.9614-1536.481.810.300.6025801.4233.401.2737.7615-1037.761.811.630.6025801.4233.403.1740.9310-1140.968.658.893.7065800.2162.452.7243.69计算结果:所选作用面积:99.3平方米总流量:8.65L/s平均喷水强度:5.23L/min.平方米入口压力:25.69米水柱B侧喷淋计算表：管段名称起点压力mH2O管道流

5、量L/s管长m当量长度管径mmK水力坡降mH2O/m流速m/s损失mH2O终点压力mH2O1-225.001.603.140.90321150.2391.680.9725.972-325.971.600.270.9032800.2391.680.2826.253-426.251.601.010.9032800.2391.680.4626.714-526.711.601.691.2032800.2391.680.6927.4010-526.751.790.871.20321150.2991.880.6227.375-627.403.380.992

6、.7040800.5092.691.8829.2811-627.521.864.131.20321150.3251.961.7329.256-729.285.251.433.1050800.3052.471.3830.6612-729.812.080.871.20321150.4042.190.8431.657-830.667.323.263.6050800.5943.454.0732.7313-833.532.380.841.40321150.5312.511.1934.728-934.739.708.383.7065800.2722.753

7、.2938.01计算结果:所选作用面积:77.8平方米总流量:9.70L/s平均喷水强度:7.48L/min.平方米入口压力:38.01米水柱最不利面积范围内A、B两层侧喷头总流量Q=18.35，水头损失为H=46.69m.喷淋泵选择：（1）流量：Q=18.35L/S（2）扬程：Hb=HZ+∑hg+HP+HK其中：HZ—消防水池水面与最不利喷头的高差，48.6m∑hg—管网总水头损失，干管：DN150Q18.35L/SV2.06m/Si55.1‰L150m局部损失取20%泵房损失取4.0m∑hg=(14.5‰*150)*1.2+4.0=7.5m

8、HP—最高层水流指示器计算压力，取46.69mHK—报警阀水头损失4.0m,水流指示器水头损失2.0mHb=48.6+7.5+46.7+4.0+2.0