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Applicability Study of Inhibitors to Corrosion Under Insulation

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Corrosion Under Insulation (CUI) is the corrosion of piping or equipment under insulation that occurs when moisture ingresses the interface between insulation and piping or equipment, helping to form corrosion cells. CUI is one of the costliest problems shared by the oil and gas industries. One reason this problem has been a perennial challenge is that CUI is difficult to detect because it occurs under the insulation. And since it occurs regardless of the type of fluid in the pipe, every part of the plant would be included in the monitoring scope.

Product Number: 51323-19244-SG
Author: Takehiro Toyoda, Ayano Yasui, Hirotaka Mizukami, Yukinori Yanase, Toshiyuki Sunaba
Publication Date: 2023
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$20.00
$20.00

Corrosion Under Insulation (CUI) is one of the most significant corrosion issues in oil and gas production facilities. One way to address this issue is to use insulation materials with corrosion inhibitors. In this study, under the simulated CUI conditions in the laboratory, the performances of some corrosion inhibitors were evaluated on carbon steel. Immersion tests of polished metal surface specimens and corroded ones were conducted in the solutions controlled 18,000 ppm chloride ions (3.0 wt.% NaCl) at 50°C, and the mass loss values were compared. In addition, potentiodynamic polarization measurements were performed to presume these inhibition mechanisms. One nonflammable inhibitor known to contain phosphates and nitrites showed good anti-corrosion performance on both the polished metal surface specimens and the corroded ones. The primary inhibition mechanism was considered to be the formation of the protective film on the steel surfaces. On the other hand, it was deemed that localized corrosion was a possible concern in spots where the inhibitor did not act sufficiently. Therefore, applying corrosion inhibitors to insulation materials is expected to be one of the corrosion control techniques for preventing further CUI as a temporary expedient until other permanent repairs are carried out.

Corrosion Under Insulation (CUI) is one of the most significant corrosion issues in oil and gas production facilities. One way to address this issue is to use insulation materials with corrosion inhibitors. In this study, under the simulated CUI conditions in the laboratory, the performances of some corrosion inhibitors were evaluated on carbon steel. Immersion tests of polished metal surface specimens and corroded ones were conducted in the solutions controlled 18,000 ppm chloride ions (3.0 wt.% NaCl) at 50°C, and the mass loss values were compared. In addition, potentiodynamic polarization measurements were performed to presume these inhibition mechanisms. One nonflammable inhibitor known to contain phosphates and nitrites showed good anti-corrosion performance on both the polished metal surface specimens and the corroded ones. The primary inhibition mechanism was considered to be the formation of the protective film on the steel surfaces. On the other hand, it was deemed that localized corrosion was a possible concern in spots where the inhibitor did not act sufficiently. Therefore, applying corrosion inhibitors to insulation materials is expected to be one of the corrosion control techniques for preventing further CUI as a temporary expedient until other permanent repairs are carried out.

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A decision support tool for best coating selection during trenchless pipe installation

Product Number: 51323-18849-SG
Author: Thierry Kerzerho, Pascal Aussant, Eric Parizot, Ahmed Fakhry, Alexandre Royer
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In the recent years, Horizontal Directional Drilling - HDD - became a real improvement for pipeline construction when crossing obstacles such as rivers, roads or railways. For the corrosion protection of the carbon steel pipeline, a protective coating is associated with cathodic protection. But for trenchless techniques, the coating shall withstand the stresses from the installation. Several standards are used to specify corrosion protection coatings for buried pipelines but those documents do not cover the specific conditions of an HDD.
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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
Publication Date: 2003
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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.
Picture for Performance of Three Types of Coatings in a Simulated Corrosion Under Insulation Condition
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Performance of Three Types of Coatings in a Simulated Corrosion Under Insulation Condition

Product Number: 51317--9296-SG
ISBN: 9296 2017 CP
Author: Junki Miyashita
Publication Date: 2017
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This paper evaluates the resistances to CUI of three types of coatings under severe CUI conditions using a vertical pipe test method. Certain possible improvements in the test method are also discussed.
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