pumping tube

Often receives various factor influence in the actual construction to cause the concrete to stop up the tube, may the pumping difference, thus the delay project progress even affects phenomenon and so on concrete quality.

在实际施工中往往受到各种各样的因素影响而导致混凝土堵管、可泵性差，从而出现耽误工程进度甚至影响混凝土质量等现象。

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Abstract As influence of beaming effect, the entry conditions of the next tube in vacuum pumping line is different, from the tube which connects with a big vessel, so the transmission probability which was worked out by the experience approximate expression will lead to more errors.

由于集束效应的影响，真空管路中后续管道与入口连接大容积的管道的入口条件不相同，因而其传输几率的计算用现有的近似计算公式将会导致较大的误差。

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This paper discusses the influence of beaming effect and worked out the accurate expression of the transmission probability of the next tube in vacuum pumping line.

本文计论了集束效应对后续管道的影响结果，以现有的计算公式为基础，导出了后续管道传输几率的较为精确的近似计算公式。

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It can remarkably reduce the friction between the rod string and the oil tube, improve the system efficiently and prolong application life of rod string and oil tube that rationally set the centralizer in the direction well sucker rod-pumping system.

合理设置定向井抽油杆柱的扶正器，可有效降低杆柱摩擦，延长检泵周期，提高系统效率和抽油杆寿命。

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Into the cup and empty the medicine by pumping it into the tube.

盖内与量杯盖密合，再将药水吸入喂药器的管内，此时量。

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