避免大口径管道采用均速管测量非洁净流体时，取压孔被堵塞问题。
The method avoids that hole of taking pressure is blocked by used average-velocity tube to measure unpurged one phase fluid in the big pipe.
水力管道输送中，无论水平管还是垂直管，混合液的单位压降均同颗粒的体积浓度有关。
During the hydraulic conveying of solids water mixtures in horizontal and vertical pipes, the specific pressure drop of the mixtures is relative to volumetric concentration of solids.
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