The calculation method on evacuation time for drying of long-distance pipeline at the state of water free is analyzed. The calculation equations are given and identified by field test.
分析了长输管道在无水状态下利用真空设备抽空所需时间的计算方法，给出了计算公式，并通过现场试验对其进行了验证。
The preparation, evaluation and field test of the fourth generation zinc-free locomotive oil is de- scribed.
本文介绍了铁路内燃机车非锌第四代油的研制、评定及行车试验结果。
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