Abstract Great damages to environment will be caused once high pressure buried pipeline leakage leaks occurs. Distributed temperature sensing (DTS) is a good monitoring method of temperature change. Gas from buried pipe leaks is monitored by changes caused by the Joule-Thomson (J-T) effect. In this work, the temperature variation of buried pipeline leakage is analyzed by finite element method (FEM). The temperature drop of nitrogen at the leak hole is calculated by using the J-T empirical formula. In addition, the site test of buried high pressure nitrogen pipeline leakage is carried out. The results show that the temperature drop the leakage hole is obvious, and the temperature directly above the leakage hole decreases with the increase of the distance from the leakage hole. The larger leakage pressure, the greater the temperature drop. Therefore, the fiber needs to be placed closer to the pipeline to monitor the soil temperature change.

中文翻译：

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高压埋地燃气管道泄漏温降试验及理论分析

摘要 高压埋地管道泄漏一旦发生，将对环境造成极大的破坏。分布式温度传感（DTS）是一种很好的温度变化监测方法。来自埋地管道泄漏的气体通过焦耳-汤姆逊 (JT) 效应引起的变化进行监测。在这项工作中，埋地管道泄漏的温度变化是通过有限元方法（FEM）分析的。泄漏孔处氮气的温降采用JT经验公式计算。此外，还进行了埋地高压氮气管道泄漏现场试验。结果表明，泄漏孔温度下降明显，泄漏孔正上方温度随着距泄漏孔距离的增加而降低。泄漏压力越大，温降越大。所以，