Author(s)

L. Jonsson

Abstract

Analysis of pressure transients in long, single pipelines for water transport has a potential of providing information on hydraulic features such as air/gas pockets,leaks. Thus the transient measured in a pipeline for sewage water had an oscillation period compatible with the location of a local high point of the pipe profile. The effect of leaks on transients was studied by means of computer modelling. It was found that leaks - even small ones of the order of 1 % - interacted significantly with the basic transient. One effect is a more or less strong attenuation of the pressure oscillations indicating the existence of a leak. Secondly the leak gives rise to extra pressure wave reflexions the time scale of which can be used for locating the leak. 1 Introduction Conveyance of water often takes place in single

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