在水电站的设计中 ,压力管道直径的大小直接影响到电站的经济效益。因此 ,合理选择压力管道的直径 ,是管道设计的主要任务之一。在过去的设计中 ,首先是根据水电站的水头等确定压力管道的类型 ,再结合厂房的布置型式和机组台数等确定其供水方式 ,按其经济流速或经验公式拟定若 In the design of hydropower station, the size of the pressure pipe diameter directly affects the economic benefits of the power station. Therefore, a reasonable choice of pressure pipe diameter, pipe design is one of the main tasks. In the past design, the first is to determine the type of pressure pipe according to the head of the hydropower station, and then determine the water supply mode based on the layout of the plant and the number of units, according to the economic flow rate or empirical formula if