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.
目前，国内带有立辊组的直缝焊管成型机大都采用双半径孔型。
The double radius hole type was commonly adopted for the forming machine of straight weld pipe with vertical roller in domestic present.
目前，国内带有立辊组的直缝焊管成型机大都采用双半径孔型。
The double radius hole type was commonly adopted for the forming machine of straight weld pipe with vertical roller in domestic present.
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