Abstract
The article deals with the issues concerning acoustic signals propagation in the large-diameter oil pipelines caused by mechanical action on the pipe body. Various mechanisms of signals attenuation are discussed. It is shown that the calculation of the attenuation caused only by internal energy loss, i.e, the presence of viscosity, thermal conductivity and liquid pipeline wall friction lead to low results. The results of experimental studies, carried out using the existing pipeline with a diameter of 1200 mm. are shown. It is experimentally proved that the main mechanism of signal attenuation is the energy emission into the environment. The numerical values of attenuation coefficients that are 0,14- 0.18 dB/m for the pipeline of 1200 mm in diameter, in the frequency range from 50 Hz to 500 Hz, are determined.
Highlights
1.Introduction Recently, basic research in the field of acoustic leak detection were aimed at the solution of the problems related to the study of the characteristics of signal propagation, mainly, to the study of the field mode structure, as well as the tasks, designed to improve the localization curacy
Paper [1] shows that using the numerical solution of the equations of hydrodynamics and dynamic elasticity theory for a three-layer waveguide: pumped liquid - a pipeline wall – soil, under certain conditions, in addition to signal attenuation due to internal losses, acoustic signals could be attenuated by energy emission into external environment
Experimental results and their discussion During the research receiving transducer was installed on the pipe wall in D pit, and an acoustic signal emitter with the generator were alternately installed in pits C, B and A
Summary
Basic research in the field of acoustic leak detection were aimed at the solution of the problems related to the study of the characteristics of signal propagation, mainly, to the study of the field mode structure, as well as the tasks, designed to improve the localization curacy. The theoretical results, obtained in [3], concerning AE signals propagation in plastic pipes are experimentally proved in [4]. The aim of this work is to study low-frequency acoustic signals propagation in the pipes with liquid and an estimation of signal attenuation.
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