一、问题的提出压力钢管直径的选择,是水电站引水系统设计的一项重要内容,其选择正确与否直接关系到水电站的经济效益。关于水电站压力钢管直径的选择,国内外已经建议了一些计算公式,但这些公式只考虑了电能损失影响,而没有考虑替代火电容量损失影响,且有的文章在公式推导中所使用的经 First, the problem put forward Pressure pipe diameter selection is an important part of hydropower station diversion system design, the choice of the right or not directly related to the economic benefits of hydropower stations. For the choice of diameter of penstock for hydropower station, some formulas have been proposed at home and abroad. However, these formulas only consider the influence of power loss, but do not consider the influence of substitution of thermal capacity loss, and some articles used in formula derivation