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51317-9287-Comparison of insulation materials and their roles on corrosion under insulation

Picture for 51317-9287-Comparison of insulation materials and their roles on corrosion under insulation
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Investigation and comparison of effects of mineral wool and a water repellent insulation on CUI. Drain holes and their ability to reduce CUI was evaluated. The susceptibility to CUI of carbon steel was investigated at 80 °C using a newly developed test rig in a controlled environment (25 °C and 50 %RH).

Product Number: 51317-9287-SG
Author: Thunyaluk Pojtanabuntoeng / Hoda Ehsani / Brian Kinsella / Michael Brameld
Publication Date: 2017
Industry: Materials Selection and Design
$20.00
$20.00
$20.00

Thermal insulation is used in petrochemical and refinery plants where pressure vessels and piping system are insulated to conserve energy. Over time, water enters into the insulation through various pathways and is entrapped at the steel surface leading to corrosion under insulation (CUI). Mineral wool is one of the most used thermal insulation even though it is prone to absorbs water and causes CUI. A water repellent insulation can be an alternative thermal insulation to prevent CUI. However, limited research has been done in the public domain.

Therefore, the present study investigates and compares the roles and influences of mineral wool and a water repellent insulations on CUI. In addition, the presence of drain holes and its ability to reduce CUI was evaluated. The susceptibility to CUI of carbon steel was investigated at 80 °C using a newly developed test rig in a controlled environment (25 °C and 50 %RH). An electrochemical impedance spectroscopy technique was used to monitor the rate of insulation dry-out. Due to localized nature of CUI, a 3D light microscope was used to analyze the surface profile of the samples after exposure to CUI. The results has emphasized the correlation between the wet time and severity of CUI.

 

Key words: Corrosion under insulation, pitting corrosion, insulation dry-out, impedance measurement

 

 

Thermal insulation is used in petrochemical and refinery plants where pressure vessels and piping system are insulated to conserve energy. Over time, water enters into the insulation through various pathways and is entrapped at the steel surface leading to corrosion under insulation (CUI). Mineral wool is one of the most used thermal insulation even though it is prone to absorbs water and causes CUI. A water repellent insulation can be an alternative thermal insulation to prevent CUI. However, limited research has been done in the public domain.

Therefore, the present study investigates and compares the roles and influences of mineral wool and a water repellent insulations on CUI. In addition, the presence of drain holes and its ability to reduce CUI was evaluated. The susceptibility to CUI of carbon steel was investigated at 80 °C using a newly developed test rig in a controlled environment (25 °C and 50 %RH). An electrochemical impedance spectroscopy technique was used to monitor the rate of insulation dry-out. Due to localized nature of CUI, a 3D light microscope was used to analyze the surface profile of the samples after exposure to CUI. The results has emphasized the correlation between the wet time and severity of CUI.

 

Key words: Corrosion under insulation, pitting corrosion, insulation dry-out, impedance measurement

 

 

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Cyclic CUI Testing of Insulation Materials

Product Number: 51317--8877-SG
ISBN: 8877 2017 CP
Author: Soeren Rasmussen
Publication Date: 2017
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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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08036 Evaluation of Steel and TSA Coating in a Corrosion Under Insulation (CUI) Environment

Product Number: 51300-08036-SG
ISBN: 08036 2008 CP
Author: Russell D. Kane, Monica M. Chauviere, and Keith Chustz
Publication Date: 2008
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A laboratory investigation of corrosion under insulation (CUI) using methods given in ASTM G189 for cyclic temperature, wet/dry conditions. Two long term exposure tests of three material conditions and two insulative materials (mineral wool and calcium silicate insulations).
Picture for Factors for Selecting Thermal Insulation Materials to Prevent Corrosion Under Insulation
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Factors for Selecting Thermal Insulation Materials to Prevent Corrosion Under Insulation

Product Number: 51319-12952-SG
Author: Kentaro Mizushima
Publication Date: 2019
$20.00

Many types of thermal insulation materials are used in oil and gas plant facilities. Recently new materials have been developed to prevent corrosion under insulation (CUI) and even the conventional materials have been improved their properties to provide better protection.When designing a plant measures to prevent CUI are studied when verifying the materials of construction determining the protective coatings systems and selecting thermal insulation and jacketing materials. Measures to prevent CUI should not be considered separately for these but rather together as a total system. Recently though while protective coatings have been studied by users coating manufacturers and independent organizations such as testing laboratories engineering firms and consultants there has been little investigation of the ability of thermal insulation materials themselves to prevent CUI.In this study the ability of various thermal insulation materials to prevent CUI in a simulated severely corrosive environment were examined. The factors influencing CUI prevention or aggravation were identified based on which it was recommended that these factors be considered when selecting thermal insulation materials during the design of a plant. As a summary of this study experiences of design of plants and related other CUI studies effective ideas relating to protective coatings thermal insulation and jacketing materials for preventing CUI will be shared.
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