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RESEARCH PRODUCT

Theoretical and experimental contributions on ultrasonic contactless examination of underground pipes through which pressurized fluids circulate

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description

Abstract In any civil or industrial construction, there are many embedded pipelines through which pressurized fluids or gases are circulate and which, over time, are subject to corrosion. Examination and monitoring of corrosion/erosion process in order to determine the service life of pipelines through which fluids circulate at different temperatures and / or pressures is a particularly important task for both the designer and the owner because knowledge of “health status” of these in time is extremely. On-site ultrasound control of wall thickness is based on simple propagation time measurements and is typically used to evaluate corrosion and erosion. The paper presents a non-destructive control used to determine pipe corrosion and lifetime, most notably ultrasonic examination without contact, using Lamb dispersing waves. For experimentation, the most important zones of a pipeline were chosen. Thus, methods of examination for 90° pipe elbow, welded pipe sections, reduction pipes, and seamless pipe sections have been established. The main parameters that have been taken into account are: actual and effective phase angle, temperature of the environment, roughness of the controlled surfaces, geometry of the controlled surfaces and the nature of the fluid flowing through the pipes (air, liquid or steam).