Investigation of factors affecting transient pressure wave propagation and implications to transient based leak detection methods in pipeline systems

2011 ◽  
Author(s):  
Huanfeng Duan
Keyword(s):  
Wave Propagation ◽  
Pressure Wave ◽  
Leak Detection ◽  
Detection Methods ◽  
Transient Pressure ◽  
Factors Affecting ◽  
Pipeline Systems

State of Research on Negative Pressure Techniques Applied to Leak Detection in Liquid Pipelines

2004 ◽  
Author(s):  
Wei Liang ◽  
Lai-bin Zhang ◽  
Zhao-hui Wang
Keyword(s):  
Pressure Wave ◽  
Analytical Techniques ◽  
Leak Detection ◽  
Point Of View ◽  
Detection Methods ◽  
Propagation Mechanism ◽  
Detection Techniques ◽  
Wave Detection ◽  
State Of Research ◽  
Signal Processing Methods

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.

scholarly journals Leak detection using cepstrum of cross-correlation of transient pressure wave signals

2017 ◽  
Vol 232 (15) ◽  
pp. 2723-2735 ◽  
Author(s):  
Niloufar Motazedi ◽  
Stephen Beck
Keyword(s):  
High Precision ◽  
Pressure Wave ◽  
Cross Correlation ◽  
Detection Method ◽  
Leak Detection ◽  
Transient Pressure ◽  
Computational Simulations ◽  
Straight Pipe ◽  
The Cross

A new leak detection method is proposed here which is based on the cepstrum of the cross-correlation of the pressure signals from two transducers. Computational simulations of leaks with different properties, size, position and shape, in a straight pipe and a T-Junction network were studied. The proposed method was successful in estimating leakages and the pipeline features with a high precision. For the results with a straight pipe, this method is considerably more accurate than using the cross-correlation leak detection method or the cepstrum method alone. However, the results obtained by cepstrum and cepstrum of cross-correlation for the T-Junction case were quite accurate, while cepstrum alone showed a slightly better precision.

Analysis of Waterhammer in Pipes With Non-Condensable Gases

2009 ◽  
Author(s):  
Charles Becht
Keyword(s):  
Wave Propagation ◽  
Bubble Size ◽  
Pressure Wave ◽  
Peak Pressure ◽  
Compressible Liquid ◽  
Gas Bubble ◽  
Transient Pressure ◽  
Solution Methods ◽  
Water Gas ◽  
Energy Determination

This paper analyzes waterhammer due to pump transients in pipes containing pockets of non-condensable gases. Solutions ranging between rigid and compressible liquid columns with pressure wave propagation are considered. An energy model is introduced to show if a system is dominated by either rigid or compressible liquid column properties. This “up-front” energy determination results in choosing an efficient formulation for predicting the transient pressure and piping forces for a given system. Example cases are given to demonstrate the solution methods. The effect of different assumptions and parameters are studied. Compressibility of water, gas bubble size, and pump startup are all studied for their effect on the peak pressure reached during a waterhammer event.

Leak detection methods for spacecraft-based crystal growth furnaces

1994 ◽  
Author(s):  
Valerie Belcher ◽  
Daniel Mackowski ◽  
Roy Hartfield, Jr. ◽  
Sushil Bhavnani
Keyword(s):  
Crystal Growth ◽  
Leak Detection ◽  
Detection Methods

scholarly journals Pressure wave propagation in a granular bed

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Stephen R. Hostler ◽  
Christopher E. Brennen
Keyword(s):  
Wave Propagation ◽  
Pressure Wave ◽  
Granular Bed
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