10MN靜水壓試驗機(jī)主缸壓力波動原因分析

Investigation on Causes for Pressure Fluctuation of Main Cylinder of 10MN Hydrostatic Testing Machine

摘要: APISpec 5L標(biāo)準(zhǔn)和GB/T9711.1-1997標(biāo)準(zhǔn)中都明確規(guī)定,外徑尺寸不小于508mm的焊接鋼管必須進(jìn)行靜水壓試驗,所以靜水壓試驗機(jī)是重要的檢驗設(shè)備。但在試壓過程中,經(jīng)常由于主油缸壓力波動致使水壓試驗不能一次完成,不僅影響正常生產(chǎn),而且在反復(fù)試壓過程中可能對鋼管質(zhì)量造成影響。為此對主油缸壓力波動的原因進(jìn)行了分析,并提出了相應(yīng)的改造方案,消除了增壓器油控制回路產(chǎn)生的壓力波動的影響,取得了良好的效果。

Abstract: Since it is specified in both API Spec 5L and GB/T9711.1 - 1977 that any steel weld pipe with O.D. no smaller than 508 mm shall be subject to hydrostatic test, the hydrostatic testing machine is regarded as a rather key inspection facility. During testing, it frequently takes place that the test can not be fulfilled in one time due the unstable pressure of the tester’s main hydraulic cylinder, which not only disturbs the normal operation cycle, but also negatively influences tube quality because of repeated tests. Therefore the elements responsible for the said pressure fluctuation of the main cylinder was investigated, and then relevant modification action was taken to eliminate the influence by the booster oil control circuit on the main cylinder pressure, having satisfactory result.