DETECTION OF “WALL THINNING” TYPE DEFECTS IN PIPELINES BY THERMAL METHOD

Year 2019, Volume: 20 , 84 - 91, 16.12.2019

Roman Orel Sergey Meshkov Volodymyr Storozhenko Aleksandr Myagkiy

https://doi.org/10.18038/estubtda.645651

Abstract

A
thermophysical model of a pipe with a local defect of the “wall thinning” type
is developed. Calculations of thermal anomalies for pipelines with different
parameters of hidden defects are performed, illustrating the possibility of
using the thermal method of nondestructive testing. The conditions and methods
of thermal control of individual sections of pipelines are specified. Thermal
imaging examination of steam pipelines of the main condensate of the nuclear
power plant was carried out. External factors that make it difficult to detect
hidden defects (the influence of external lighting, cylindrical shape of
controlled objects, powerful external heat sources) are analyzed. It was found
that cavitation phenomena significantly increase the temperature drop in the
locations of local defects. The possibility of using the thermal method of
nondestructive testing for rapid detection of hidden defects such as “wall
thinning” in the pipelines of the main condensate has been confirmed
experimentally

Keywords

thermal control, pipelines, wall thinning, cavitation phenomena, hidden defects

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