Leak detection in pipelines by frequency response method / Ahmed M. Sattar in Journal of hydraulic research, Vol. 46 extra issue (2008)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 46 extra issue (2008) . - p. 138-151 Titre : Leak detection in pipelines by frequency response method Titre original : La détection de fuite dans les canalisations par la méthode de réponse en fréquence Type de document : texte imprimé Auteurs : Ahmed M. Sattar, Auteur ; M. Hanif Chaudhry, Auteur Article en page(s) : p. 138-151 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Leak-steady oscillatory Pipelines Transfer matrix Frequency reponse Amplitude of pressure oscillations Even harmonics Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : A new technique for the detection of leaks in a pipeline is presented utilizing its frequency response. In the system frequency response, a leak increases the amplitude of pressure oscillations at the even harmonics. Such an increase in amplitude has an oscillatory pattern; the frequency and amplitude of this pattern may be utilized to predict the Location and discharge of a leak. In this technique, the pressure transient history at one location is sufficient and the history of the transient in the pipe prior to leak is not needed; this makes it advantageous over a number of other existing techniques, in addition to being simpler to use. It is shown that the technique successfully detects the location of a leak in a number of simple systems with leak discharge as low as 0.2% of the steady discharge. The technique is verified by comparing the results with those computed by using the method of characteristics. Practical issues and limitations for field implementations are discussed. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Leak detection in pipelines by frequency response method = La détection de fuite dans les canalisations par la méthode de réponse en fréquence [texte imprimé] / Ahmed M. Sattar, Auteur ; M. Hanif Chaudhry, Auteur . - p. 138-151. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 extra issue (2008) . - p. 138-151 Mots-clés : Leak-steady oscillatory Pipelines Transfer matrix Frequency reponse Amplitude of pressure oscillations Even harmonics Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : A new technique for the detection of leaks in a pipeline is presented utilizing its frequency response. In the system frequency response, a leak increases the amplitude of pressure oscillations at the even harmonics. Such an increase in amplitude has an oscillatory pattern; the frequency and amplitude of this pattern may be utilized to predict the Location and discharge of a leak. In this technique, the pressure transient history at one location is sufficient and the history of the transient in the pipe prior to leak is not needed; this makes it advantageous over a number of other existing techniques, in addition to being simpler to use. It is shown that the technique successfully detects the location of a leak in a number of simple systems with leak discharge as low as 0.2% of the steady discharge. The technique is verified by comparing the results with those computed by using the method of characteristics. Practical issues and limitations for field implementations are discussed. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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