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首页> 外文会议>Biennial International Pipeline Conference(IPC 2004) vol.3; 20041004-08; Calgary(CA) >STATE OF RESEARCH ON NEGATIVE PRESSURE TECHNIQUES APPLIED TO LEAK DETECTION IN LIQUID PIPELINES
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STATE OF RESEARCH ON NEGATIVE PRESSURE TECHNIQUES APPLIED TO LEAK DETECTION IN LIQUID PIPELINES

机译：负压技术在液体管道泄漏检测中的研究现状

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摘要

In China, the rarefaction-pressure wave techniques are widely used to diagnose the leakage fault for liquid pipelines. Many leaking propagating assumptions, such as stable single-phased flow hypothesis and none rarefaction wave front hypothesis, are often uncertain in the process of leak detection, which can easily result in some errors. Thus the rarefaction-pressure wave techniques should be integrated with other analytical techniques to compute a more accurate leak location. Additionally, the development trends of rarefaction-pressure wave techniques lie in three aspects. First, rarefaction-pressure wave detection techniques will be integrated with other compatible detection techniques and modern signal processing methods to solve the complex problems encountered in leak detection. Second, studies of rarefaction-pressure wave techniques have advanced to a new stage. The deductions on propagation mechanism of rarefaction-pressure wave have been successfully applied to determine leaks qualitatively. Third, analysis on rarefaction-pressure wave detection techniques will be made from a quantitative point of view. The quantitative data have been used to deduce leak amounts and location. The purpose of this paper is to present the recent achievements in the study of improved rarefaction-pressure wave detection techniques. The rarefaction-pressure wave detection methods, effects of incomplete information conditions, the improvements of rarefaction-pressure wave detection techniques with modified factors and propagation mechanisms are comprehensively investigated. The disfigurements of rarefaction-pressure wave are analyzed. The corresponding methods for resolving such problems as ill diagnostic information and weak amplitude values are put forward. Several methods for stronger small leakage detection ability, higher leakage positioning precision, lower false alarm rates are proposed. The application of rarefaction-pressure wave detection techniques to safety protection of liquid pipelines is also introduced. Finally, the prospect of rarefaction-pressure wave detection techniques is predicted.
机译：在中国，稀疏压力波技术被广泛用于诊断液体管道的泄漏故障。许多泄漏传播假设，例如稳定的单相流假设和无稀疏波前假设，在泄漏检测过程中通常是不确定的，很容易导致一些错误。因此，稀疏压力波技术应与其他分析技术结合起来以计算更准确的泄漏位置。此外，稀疏压力波技术的发展趋势还体现在三个方面。首先，稀疏压力波检测技术将与其他兼容的检测技术和现代信号处理方法集成在一起，以解决泄漏检测中遇到的复杂问题。第二，稀疏压力波技术的研究进入了一个新的阶段。稀疏压力波传播机理的推论已成功地应用于定性确定泄漏。第三，将从定量的角度分析稀疏压力波检测技术。定量数据已用于推断泄漏量和位置。本文的目的是介绍改进稀疏压力波检测技术研究的最新成果。全面研究了稀疏压力波检测方法，信息条件不完全的影响，稀疏压力波检测技术的改进因素和传播机制的改进。分析了稀疏压力波的破坏。提出了解决诊断信息不良，幅值偏弱等问题的方法。提出了几种增强小泄漏检测能力，提高泄漏定位精度，降低误报率的方法。介绍了稀疏压力波检测技术在液体管道安全防护中的应用。最后，预测了稀疏压力波检测技术的前景。

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