Abstract

Background The main criterion for the safe operation of pipelines during cleaning and in-line diagnostics is the non-stop movement of the device (projectile) from the launch chamber to the reception chamber. Stopping or jamming a projectile in the area between the launch and reception cameras is an emergency. Therefore, when passing shells through the pipeline, it is necessary to constantly monitor their movement and periodically record the passage time of the shell at the control points from the moment it is launched until it arrives at the final site, i.e. accompany throughout the pipeline. When projectiles of any design move in the pipeline, the cuffs and / or disks of the projectile rub against the inner wall, at which acoustic waves are generated. These waves propagate both along the wall of the pipeline, and along the pumped liquid in both directions. The acoustic method for controlling the movement of shells in the pipeline is one of the effective ways to control the movement and can provide the greatest detection range of the projectile. Aims and Objectives Investigation of the amplitude-frequency characteristics of the noise of the cleaning and diagnostic devices (shells) in pipelines with the aim of developing a technical device for monitoring their movement and recording travel time at control points. Results The largest amplitude of the noise of movement of the in-tube projectile is observed in the frequency range from 20-40 to 4000-5000 Hz, and the frequency varies from 5-10 to 8000-10000 Hz. The amplitude of the noise largely depends on the distance between the moving projectile and the installation location of the acoustic sensor. When the projectile passes through the transverse welds of the pipeline, a short-term surge in the amplitude of the noise of the projectile movement occurs. The noise amplitude is inversely related to the thickness of the paraffin layer in the oil pipeline and the magnitude of its change from the thickness of the paraffin is insignificant. The influence of the material of the cuffs/disks of the projectile on the amplitude of the acoustic signal is also insignificant

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