立管压力波动幅度随气相折算速度的增大先增大后减小；
The pressure fluctuation of the riser first increases then decreases with the superficial gas velocities;
如果立管压力的变化规律与泵冲数的变化规律不一致，预警解决方案就可以识别出来。
The alarm solution identifies changes in the SPP that are not consistent with the changes, if any, in SPM.
本文主要进行了以下三方面试验研究：第一，稳定压力下UPVC普通单立管、双立管压力波动的模拟试验。
This Paper conducted a pilot study by the following three areas:Firstly, pressure fluctuation experiments of UPVC single pipe, double pipe under the steady pressure condition were conducted.
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