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CUI Assessment Near Insulation Support Rings Using Pulsed Eddy Currents

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Pulsed Eddy Currents (PEC) is an electromagnetic inspection method for detecting thickness variations in carbon steel and cast iron through various insulation and/or protective components. It is also resilient to liftoff variations, making it a valuable technique for Corrosion Under Insulation (CUI) assessment. The technology is widely used in the energy and petrochemical industries to detect and estimate the extent of corrosion in insulated or fire-proofed components like pipes and tanks without removing the covering.

Product Number: 51323-19031-SG
Author: Donald Picard, Olivier Bellavance, Charles Tremblay, Andréanne Potvin
Publication Date: 2023
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$20.00
$20.00

Pulsed Eddy Current (PEC) is a proven inspection technology used to detect and assess wall loss in ferromagnetic materials under any layer of insulation or coating that prevents direct access to the surface. One of its main applications is detecting Corrosion Under Insulation (CUI) in pressure vessels. Corrosion, caused by water or condensation ingress under the insulation, is generally found just above the Insulation Support Rings (ISR), interfering with the PEC signals. Hence, assessing this corrosion requires advanced data analysis tools combined with a clear understanding of the influence of the ISR on the signals. The objective of this paper is thus to establish a data analysis workflow for assessing this corrosion by evaluating the impact of the ISR on the PEC signals. The discrimination of the influence of the ISR on PEC data was best achieved by scanning perpendicular to the ISR and by analyzing signals taken on representative manufactured pressure vessel samples. Advanced analysis tools developed in recent years and the various PEC signals are presented and explained, demonstrating the capabilities of this technology to reveal the presence of true wall loss near interfering components. Such challenging applications require advanced data analysis tools and efficient workflow analyses to increase confidence.

Pulsed Eddy Current (PEC) is a proven inspection technology used to detect and assess wall loss in ferromagnetic materials under any layer of insulation or coating that prevents direct access to the surface. One of its main applications is detecting Corrosion Under Insulation (CUI) in pressure vessels. Corrosion, caused by water or condensation ingress under the insulation, is generally found just above the Insulation Support Rings (ISR), interfering with the PEC signals. Hence, assessing this corrosion requires advanced data analysis tools combined with a clear understanding of the influence of the ISR on the signals. The objective of this paper is thus to establish a data analysis workflow for assessing this corrosion by evaluating the impact of the ISR on the PEC signals. The discrimination of the influence of the ISR on PEC data was best achieved by scanning perpendicular to the ISR and by analyzing signals taken on representative manufactured pressure vessel samples. Advanced analysis tools developed in recent years and the various PEC signals are presented and explained, demonstrating the capabilities of this technology to reveal the presence of true wall loss near interfering components. Such challenging applications require advanced data analysis tools and efficient workflow analyses to increase confidence.

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Product Number: 51322-18155-SG
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Petrochemical facilities and refineries consist of many miles of above ground piping that transports product between processing and storage units. These pipes are either supported at ground level or in multi-story pipe racks on varying types and sizes of supporting structures. A common problem these structures create is corrosion and erosion at the junction between the pipe and the support, which reduces the remaining wall thickness of the pipe and compromises the integrity of the entire system. 
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00101 A New Inspection Technology for Detecting Corrosion Under Insulation

Product Number: 51300-00101-SG
ISBN: 00101 2000 CP
Author: Joe M. Galbraith
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03029 STRATEGIES TO PREVENT CORROSION UNDER INSULATION IN PETROCHEMICAL INDUSTRY PIPING

Product Number: 51300-03029-SG
ISBN: 03029 2003 CP
Author: Brian J. Fitzgerald, Peter Lazar III, Robert M Kay, Stefan Winnik
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Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
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