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为了提高管道输送效率,在西气东输三线西段一级地区的天然气管道上首次采用了0.8设计系数。按照设计要求,较高设计系数管道强度试压产生的环向应力应不小于100%SMYS,对于如此高的试压强度,国内尚无经验可循,为了保障高强度水压试验的顺利进行,参考国内外规范,并结合0.8设计系数管道的特点,编制了高强度水压试验方案并制定了试压流程,试压过程中首次采用p-V曲线、应力应变监测、智能变形检测等手段全方位监测试压过程中管道的膨胀变形情况。试验结果证明,试压方案科学合理。高强度水压试验的成功,为较高设计系数天然气管道的高强度水压试验积累了宝贵经验,为在一级地区推广采用0.8设计系数奠定了良好的实践基础。
In order to improve the pipeline transportation efficiency, the design factor of 0.8 was adopted for the first time on the natural gas pipeline in the first stage of the west section of the third West-East Gas Pipeline. In accordance with the design requirements, the higher the design factor pipe stress generated by the hydrostatic test of the hoop stress should not be less than 100% SMYS, for such a high test pressure strength, there is no domestic experience, in order to ensure the smooth progress of high-strength hydraulic test, Reference to domestic and foreign norms, combined with the design coefficient of 0.8 pipeline characteristics, prepared a high-strength hydraulic test program and developed a pressure test process, the pressure test for the first time using the pV curve, stress and strain monitoring, intelligent deformation detection and other means Test pressure during the expansion and deformation of the pipeline. Test results show that the pressure test program is scientific and rational. The success of high-strength hydrostatic test has accumulated valuable experience for the high-strength hydrostatic test of natural gas pipelines with higher designed coefficient, laying a good practical foundation for promoting the design factor of 0.8 in the first-level area.