穿越管段地面试压验收标准修改意见

Suggestions for modification of acceptance criteria for ground pressure test of crossing pipeline section

以广西南宁至柳州成品油输送管道工程红水河穿越段地面管道压力试验为例,分析了油气管道穿越段等地面试压管段出现的稳压期间压力剧烈波动的现象,指出试验压力受试压介质温度变化的影响非常大,而试压介质的温度变化主要受环境温度的影响。分别推导出地面管道进行纯水压力试验和纯气体压力试验过程中管内温度和压力关系的计算公式,剖析了环境温度变化对试验压力的影响规律。针对现行国家标准中穿越段等地面试压管段验收标准关于压力试验要求和验收标准的规定难于操作的问题,提出了具体的修改意见,并对现行试验方法提出了改进建议。

Ground pipeline pressure test of Guangxi Nanning-Liuzhou product oil pipeline project in the Honghe crossing section is taken as a case to analyze severe pressure fluctuations in the crossing section of oil and gas pipeline and other ground pressure test pipeline sections during the pressure stabilization period.Results indicate that the test pressure is largely affected by the temperature change of pressure test medium,mainly subject to ambient temperature.A computational formula for the relationship between temperature and pressure of ground pipeline is deduced respectively in the pure water pressure test and pure gas pressure test,and finally the law of the ambient temperature affecting the test pressure is analyzed.In view of difficult implementation of regulations on pressure test requirements and acceptance criteria in existing national standards for acceptance criteria of crossing section and other ground pressure test pipeline sections,specific modification suggestions are proposed.In addition,a suggestion is also provided to the improvement of existing test methods.