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水力计算是设计各用途管道的主要过程之一。管道主要设备的正确选择及其在输送方式变化时运行的合理控制，在很大程度上都取决于计算的准确性。所用公式简单同样具有很重要的意义，许多工艺问题的解析解及研究的可能性大多依赖这一点。管道专家们对水力计算的计算关系的改进问题总是给予极大的关注。压头摩擦损失H是管道压头总损失不可缺少的组成部分。这是根据下述公式计算的。
Hydraulic calculation is one of the main processes for designing pipelines for various purposes. The correct choice of the main equipment of the pipeline and its reasonable control over the operation of the conveying method are largely dependent on the accuracy of the calculations. The simple formula used is equally important, and many of the analytical solutions to the problem of processes and the possibilities of research are mostly dependent on this. Pipeline experts always pay great attention to the improvement of the computational relation of hydraulic calculation. Indenter friction loss H is an integral part of the total loss of pipeline head. This is calculated according to the following formula.