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51315-5747-Long-Range Microwave Detection of Wet Insulation for CUI Mitigation

Picture for Long-Range Microwave Detection of Wet Insulation for CUI Mitigation
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Product Number: 51315-5747-SG
ISBN: 5747 2015 CP
Author: Francesco Simonetti
Publication Date: 2015
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Corrosion under insulation (CUI) is a common cause of pipeline failure in the oil and gas industry. Its detection with conventional inspection techniques is challenging due to the presence of the insulation layer and a protective metallic cladding that prevent direct access to the pipe surface. Currently several techniques are being developed to detect sections of wet insulation since water is a necessary precursor to corrosion. Among these guided microwave testing has been proposed as a cost-effective approach to screen an extended length of pipeline. The pipe and metallic cladding naturally form a large coaxial transmission line in which the insulation acts as a dielectric and supports the propagation of microwave signals. The inspection is performed by launching a microwave signal from an array of antennas permanently installed at one location along the pipeline. Wet insulation is then detected according to the radar principle; water results in the partial reflection of the incident microwave signal owing to the permittivity contrast between dry and wet insulation. This paper reviews the underpinning principles of long-range guided microwave testing and presents a new study aimed at demonstrating the sensitivity of the technique in the presence of complex water saturation gradients inside the insulation.

Corrosion under insulation (CUI) is a common cause of pipeline failure in the oil and gas industry. Its detection with conventional inspection techniques is challenging due to the presence of the insulation layer and a protective metallic cladding that prevent direct access to the pipe surface. Currently several techniques are being developed to detect sections of wet insulation since water is a necessary precursor to corrosion. Among these guided microwave testing has been proposed as a cost-effective approach to screen an extended length of pipeline. The pipe and metallic cladding naturally form a large coaxial transmission line in which the insulation acts as a dielectric and supports the propagation of microwave signals. The inspection is performed by launching a microwave signal from an array of antennas permanently installed at one location along the pipeline. Wet insulation is then detected according to the radar principle; water results in the partial reflection of the incident microwave signal owing to the permittivity contrast between dry and wet insulation. This paper reviews the underpinning principles of long-range guided microwave testing and presents a new study aimed at demonstrating the sensitivity of the technique in the presence of complex water saturation gradients inside the insulation.

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03031 ADVANCED NDE METHODS OF INSPECTING INSULATED VESSELS AND PIPING FOR ID CORROSION AND CORROSION UNDER INSULATION (CUI)

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Cyclic CUI Testing of Insulation Materials

Product Number: 51317--8877-SG
ISBN: 8877 2017 CP
Author: Soeren Rasmussen
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Via the testing of six generically different insulation materials, the study has tried to identify factors in an insulation material that are more influential on corrosion rates of carbon steel.

 
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51314-4079-Solution to Corrosion Under Insulation (CUI) with Three Layered CUI Control and CUI Warning Systems

Product Number: 51314-4079-SG
ISBN: 4079 2014 CP
Author: Miki Funahashi
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