管道-管径的确定当流体的流量已知时，管径的大小取决于允许的流速或允许的摩擦阻力（压力降）。流速大时管径小，但压力降值增大。因此，流速大时可以节省管道基建投资，但泵和压缩机等动力设备的运行能耗费用增大。此外，如果流速过大，还有可能带来一些其他不利的因素。因此管径应根据建设投资、运行费用和其他技术因素综合考虑决定。

Pipe-diameter determination When the flow rate of fluid is known, the size of pipe diameter depends on the allowable flow rate or allowable friction resistance (pressure drop). When the flow rate is high, themusu.71ix.comqichezuotao.07858.netduanluqi.37ix.com.cnmojulcs.37ix.com.cnckdiping.37ix.com.cn

fuheguanl.37ix.com.cndiameter of the pipe is small, but the pressure drop increases. Therefore, when the flow rate is high, the investment of pipeline infrastructure can be saved, but the running energy consumption of power equipment such as pumps and compressors increases. In addition, if the flow rate is too high, there may be some other adverse factors. Therefore, the pipe diameter should be determined according to the construction investment, operation cost and other technical factors.