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1、给水管材的选择： 1.首先判断 介质特性 热水/冷水 热水 1 根据管材的使用环境（条件） 分级 2 再根据设计压力PD选择管材S系列 冷水 直接根据管材公称压力PN选择管材S系列注意：不管冷热水 因条件变化 管材工作压力PS；设计压力PD；公称压力PN 之间有个调整系数 mPD =0.7PN PS=0.60.8 PD ?给水管网的水利计算管径、水力损失、管网所需压力给水管网的水利计算的前提是：已知设计秒流量管径的确定：由水在管道内的经济流速确定生活给水管道的水流速度工程直径（）水流速度（）工程设计中可采用下列数值：，；，；及以上的管径，。给水管道水力计算的标准 以一个给水龙头的用水流量0.2
2、 L/S，为一个当量。给水钢管水利计算表管径mm流量 L/s流速m/si kpa/m0.2L/S 一个当量同时使用水龙头量 流速0.61 m/s0.100.580.9850.181.052.911流速0.61 m/s0.180.560.6010.351.092.042流速0.81.2 m/s0.400.750.7480.651.221.854流速0.81.2 m/s0.750.790.561.201.271.356 流速0.81.2 m/s0.950.760.431.601.271.148流速1.5 m/s1.800.850.3783.51.651.3617.5流速1.5 m/s3.00.85
3、0.2745.51.560.87527.5流速1.8 m/s4.50.910.2469.01.810.94645流速1.8 m/s9.01.040.22116.01.850.68580给水塑料管水利计算表管径mm流量 L/s流速m/si kpa/m0.2L/S 一个当量同时使用水龙头量 流速0.61 m/s0.100.500.2750.200.990.9401流速0.61 m/s0.200.530.2360.401.050.7032 流速0.81.2 m/s0.500.760.2790.801.210.6434流速0.81.2 m/s0.800.790.2291.501.470.6987.5流
4、速0.81.2 m/s1.500.900.2172.001.200.36110流速1.5 m/s2.500.950.5174.001.510.408207565流速1.5 m/s4.001.040.1666.001.560.34230流速1.8 m/s7.501.350.21310.001.800.35450流速1.8 m/s7.500.900.0810.001.200.1350PVC-U（De）与公称直径（DN）对照表公称直径（DN）5075100150塑料管（De）5075110160200225250315355400查给排水课本 第五版 塑料管的管径流量表为什么用公称直径（DN）来表达
5、？给水钢管水利计算表管径mm流量 L/s流速i kpa/m0.580.9850.701.370.821.820.942.341.052.910.180.560.6010.200.620.720.250.781.090.300.931.530.351.092.040.400.750.7480.450.850.9320.500.941.130.551.041.350.601.131.590.651.221.850.750.790.560.800.840.630.850.900.700.900.950.780.951.000.861.001.050.951.101.161.141.201.271.3
6、50.950.760.431.000.800.471.100.870.561.200.950.661.301.030.761.401.110.881.501.191.011.601.271.141.800.850.3781.900.890.4182.00.940.4602.21.040.5492.41.130.6452.61.220.7492.81.320.8693.01.410.9983.51.651.363.00.850.2743.50.990.3654.01.130.4684.51.280.5865.01.420.7235.51.560.8754.50.910.2465.01.010.3
7、05.51.110.3586.01.210.4216.51.310.4947.01.410.5737.51.510.65708.01.610.7488.51.710.8449.01.810.9469.01.040.2219.51.1010.01.1510.51.2111.01.2711.51.3312.01.3912.51.4413.01.5014.01.6215.01.730.60216.01.850.685给水管网水利计算表 计算管段编号当量总数Ng同时出流概率（）设计秒流量（L/s）管径mm流速（m/s）每米官场严惩水头损失kpa/m管段长Lm管段沿程水头损失hy=iLkpa管段沿程水头
8、损失累计kpa此为住宅生活给水水利计算其中同时出流概率（）的计算要注意顺序编号管段编号卫生器具卫生器具名称数量当量当量总数设计秒流量q(L/s)DNmmVm/s单阻Ikpa管长m沿程水头损失hy=iLkpa备注当量浴盆洗脸盆坐便器自至（n/N）1.00.50.5N1234567891011121314101n/N1/1.0-1.00.2151.173.540.51.77212n/N1/1.01/0.5-1.50.3200.931.530.40.61323 n/ N1/1.01/0.51/0.52.00.4250.750.751.00.75434n/N2/2.02/1.02/1.04.00.83
9、20.840.633.02.88545n/N4/4.04/2.04/2.08.01.41321.491.863.05.58656 n/ N6/6.06/3.06/3.012.01.73401.371.334.96.52此为集体宿舍宾馆旅店中小学校公共厕所等生活给水设计秒流量计算公式为q=0.2*注意当量数的计算的设计秒流量得管径水力损失管段编号卫生器具卫生器具名称数量当量当量总数设计秒流量q(L/s)DNmmVm/s单阻Ikpa管长m沿程水头损失hy=iLkpa当量淋浴器及厨房 小便器 污水池蹲便独锌钢管塑料管自至（n/N）0.516N234567891011121301n/N-1/660.735252512
