给水管径选择.docx

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=0.7PNPS=0.6~0.8PD?????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（mm）15--2025--4050”-70M80水流速度（m/s）<1.0<1.2<1.5<1.8工程设计中可采用下列数值：DN15〜DN20,v=0.6〜1.Om/s;DN25〜DN40,v=0.8〜1.2m/s;DN50〜DN70;vVl.5m/s;DN8及以上的管径，vV1.8m/s给水管道水力计算的标准以一个给水龙头的用水流量0.2L/S,为一个当量给水车冈管水利计算表管径mm流里L/s流速m/sikpa/m0.2L/S一个当量同时使用水龙头量DN15流速0.6~1m/s0.100.580.9850.181.052.911DN20流速0.6~1m/s0.180.560.6010.351.092.042DN25流速0.8~1.2m/s0.400.750.7480.651.221.854DN32流速0.8~1.2m/s0.750.790.561.201.271.356DN400.950.760.43流速0.8~1.2m/s1.601.271.148DN50流速v1.5m/s1.800.850.3783.51.651.3617.5DN70流速v1.5m/s3.00.850.2745.51.560.87527.5DN80流速v1.8m/s4.50.910.2469.01.810.94645DN100流速v1.8m/s9.01.040.22116.01.850.68580给水塑料管水利计算表管径mm流里L/s流速m/sikpa/m0.2L/S一个当量同时使用水龙头量De20DN15流速0.6~1m/s0.100.500.2750.200.990.9401De25DN20流速0.6~1m/s0.200.530.2360.401.050.7032De32DN25流速0.8~1.2m/s0.500.760.2790.801.210.6434De40DN32流速0.8~1.2m/s0.800.790.2291.501.470.6987.5De50DN40流速0.8~1.2m/s1.500.900.2172.001.200.36110De63DN50流速v1.5m/s2.500.950.5174.001.510.40820De75DN65流速v1.5m/s4.001.040.1666.001.560.34230De90DN80流速v1.8m/s7.501.350.21310.001.800.35450De110DN100流速v1.8m/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？？？？？给水字冈管水利计算表管径mmDN15流里L/s流速m/sikpa/m0.100.580.9850.120.701.370.140.821.820.160.942.340.181.052.91DN200.180.560.6010.200.620.720.250.781.090.300.931.530.351.092.04DN250.400.750.7480.450.850.9320.500.941.130.551.041.350.601.131.590.651.221.85DN320.750.790.560.800.840.630.850.900.700.900.950.780.951.000.861.001.050.951.101.161.141.201.271.35DN400.950.760.431.000.800.471.100.870.561.200.950.661.301.030.761.401.110.881.501.191.011.601.271.14DN501.800.850.3781.900.890.4182.00.940.4602.21.040.5492.41.130.6452.61.220.7492.81.320.8693.01.410.9983.51.651.36DN703.00.850.2743.50.990.3654.01.130.4684.51.280.5865.01.420.7235.51.560.875DN804.50.910.2465.01.010.305.51.110.3586.01.210.4216.51.310.4947.01.410.5737.51.510.65708.01.610.7488.51.710.8449.01.810.946DN1009.01.040.2219.51.1010.01.1510.51.2111.01.2711.51.3312.01.3912.51.4413.01.5014.01.6215.01.730.60216.01.850.685给水管网水利计算表计算管段编亏当量总数Ng同时出流概率U(%)设计秒流里(L/s)管径DNmm流速(m/s)每米官场严惩水头损失1kpa/m管段长Lm管段沿程水头损失hy=iLkpa管段沿程水头损失累计kpa此为住宅生活给水水利计算其中同时出流概率U(%)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备注浴盆洗脸盆坐便器自至(n/N)1.00.50.52N1234567891011121314101n/N1/1.0——1.00.2151.173.540.51.77212n/N1/1.01/0.5—1.50.3200.931.530.40.61323n/N1/1.01/0.51/0.52.00.4250.750.751.00.75434n/N2/2.02/1.02/1.04.00.8320.840.633.02.88545n/N4/4.04/2.04/2.08.01.41321.491.863.05.58656n/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=0.2a*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当电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)0.5162N234567891011121301n/N—1/660.735252512n/N2/12121.04323223n/N3/18181.27323234n/N/9.552/11/13/1829.551.63404045n/N/2.722.71.456n/N厨房需要几个当量？？？？？？？？？？？？？？？？？/。