Abstract
Experiments have been performed to demonstrate that ultrasound in the 100–400 kHz frequency range can be used to propagate signals through various types of industrial insulation. This is despite the fact that they are highly attenuating to ultrasonic signals due to scattering and viscoelastic effects. The experiments used a combination of piezocomposite transducers and pulse compression processing. This combination allowed signal-to-noise levels to be enhanced so that signals reflected from the surface of an insulated and cladded steel pipe could be obtained.
Highlights
Corrosion under insulation (CUI) is a significant industrial problem that has been identified as one of major concern [1]
Initial dry contact experiments indicated that transmission though common forms of insulation
Initial dry contact experiments indicated that transmission was was possible in various insulation types, provided pulse compressionwas wasused usedinincombination combination with with possible in various insulation types, provided pulse compression piezocomposite transducers, the latter providing sufficient bandwidth over the kHz frequency piezocomposite transducers, the latter providing sufficient bandwidth over the 100–400 kHz frequency range studied here
Summary
Corrosion under insulation (CUI) is a significant industrial problem that has been identified as one of major concern [1]. The basic cause is the leakage of water through the insulation and subsequent contact with the surface of the underlying structure (e.g., a steel pipe), which corrodes. Water can reach the surface of the underlying metal through two different mechanisms. The first is damage caused to the insulation layers, which creates a path to the metallic material underneath. Water could diffuse into the insulation and reach the metal surface, initiating the corrosion process. CUI tends to occur at low-lying sections where water can concentrate and/or where there are junctions in structures or pipework. This accelerates corrosion of the outer metal surface, leading to pitting, cracking, and the possibility of subsequent failure
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