有压管道水力瞬变的正确分析，对工程安全运行影响较大。
Proper analysis on the hydraulic transient in pressure pipeline is important for the safety operation of project.
在实际运行中，湿天然气在输送管道中存在气液两相，因此管道中的流动总是处于慢瞬变流动状态。
The wet natural gas in transmission pipeline assumes two phase of gas and liquid, so its flowing always assumes a slow transient flow state.
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