evaluating corrosion under insulation (cui)

What is Corrosion Under Insulation? EVALUATING CORROSION UNDER INSULATION (CUI) CUI occurs on the pipe surface when water penetrates the insulation system (jacketing, insulation, coating) and comes into contact with the pipe surface. This water ingress causes corrosion to form on the surface of the pipe, threatening the integrity of the pipe and the overall performance of the system. Hydrophobic, microporous blanket insulation is thin, flexible, and ideal for tights spaces that demand high thermal-stability. It is less corrosive than deionized water, and substantially less corrosive than competing silica aerogel blanket insulations. Microporous blankets can also be utilized as part of a hybrid system with insulations like calcium silicate, improving thermal performance without sacrificing space. ASTM C1617: Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals. NACE TG516: Innovative, new testing protocol that explores the long-term performance of insulation in low-temperature sweating conditions and high/low-temperature cycling conditions. During the test, the test apparatus (jacketing, insulation, pipe) is submerged in a solution with up to 1500ppm Cl. The apparatus is measured under two conditions: cyclic condition, involving both high and low temperatures where the insulation is dries between cycles, and a low-temperature sweating condition, where the insulation never dries. Cost of corrosion globally: $2.5 trillion annually ASTM C1617: Mass Loss Corrosion Rate (MLCR) Microporous Silica Aerogel Deionized Blanket Blanket Water (control) NACE TG516 Insulation 2-Month (Tap) Mean 2 month tap + 4 month Cl Corrosion Depth (µm) mean Corrosion Depth (µm) Microporous Blanket 7 213 Silica Aerogel Blanket 91 1396 Microporous Insulation That Helps Inhibit CUI • Extremely low corrosive potential • Lower corrosion than other blanket insulations • Hydrophobic • Thin, flexible and easy to install MLCR (Mils/Year) 19.0 3.9 6.9 Microporous Blanket Aerogel Blanket Microporous Blanket Aerogel Blanket Testing the Potential of CUI Addressing CUI with Insulation Surface corrosion Localized corrosion pitting Thermal Cycling Conditions Sweating Conditions Microporous Blanket Aerogel Blanket Sweating Conditions CORROSION E L E C T R O C H E M I C A L P O T E N T I AL E L E C T R O L Y T E ( m o i s t u r e / w a t e r ) ( u n p r o t e c t e d ) M E T A L Microporous Blanket Aerogel Blanket Thermal Cycling Conditions Visit the JM booth #10 NACE TG516

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What is Corrosion Under Insulation?

EVALUATING CORROSION UNDER INSULATION (CUI)

CUI occurs on the pipe surface when water penetrates the insulation system (jacketing, insulation, coating) and comes into contact with the pipe surface. This water ingress causes corrosion to form on the surface of the pipe, threatening the integrity of the pipe and the overall performance of the system.

Hydrophobic, microporous blanket insulation is thin, flexible, and ideal for tights spaces that demand high thermal-stability. It is less corrosive than deionized water, and substantially less corrosive than competing silica aerogel blanket insulations. Microporous blankets can also be utilized as part of a hybrid system with insulations like calcium silicate, improving thermal performance without sacrificing space.

ASTM C1617: Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals.

NACE TG516: Innovative, new testing protocol that explores the long-term performance of insulation in low-temperature sweating conditions and high/low-temperature cycling conditions. During the test, the test apparatus (jacketing, insulation, pipe) is submerged in a solution with up to 1500ppm Cl. The apparatus is measured under two conditions: cyclic condition, involving both high and low temperatures where the insulation is dries between cycles, and a low-temperature sweating condition, where the insulation never dries.

Cost of corrosion globally:

$2.5 trillion annually

ASTM C1617: Mass Loss Corrosion Rate (MLCR)

Microporous Silica Aerogel Deionized Blanket Blanket Water (control)

NACE TG516

Insulation 2-Month (Tap) Mean 2 month tap + 4 month Cl Corrosion Depth (µm) mean Corrosion Depth (µm)

Microporous Blanket 7 213

Silica Aerogel Blanket 91 1396

Microporous Insulation That Helps Inhibit CUI• Extremely low corrosive potential• Lower corrosion than other blanket insulations• Hydrophobic• Thin, flexible and easy to install

MLC

(Mils

/Yea

r) 19.03.9 6.9 Microporous Blanket Aerogel BlanketMicroporous BlanketAerogel Blanket

Testing the Potential of CUI

Addressing CUI with Insulation

Surface corrosion

Localized corrosion pitting

Thermal Cycling Conditions Sweating Conditions

Microporous Blanket

Aerogel Blanket

Sweating Conditions