闭水试验和闭气试验是无压管道进行严密性试验最常采用的两种试验方法。
Two commonly used methods of pressurization test of pipelines with free-surface in best common are close water test and close gas test.
在重力输水系统的规划设计中，有时采用无压管渠与压力管道相结合的方式输水。
In the planning and design of gravity water transfer system, the combined pattern of pressure free pipe and canal with pressured pipe line is sometimes adopted to carry out water transfer.
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