{"id":15296,"date":"2026-10-01T22:37:39","date_gmt":"2026-10-01T22:37:39","guid":{"rendered":"https:\/\/insulation.org\/io\/?post_type=articles&p=15296"},"modified":"2026-11-03T14:18:11","modified_gmt":"2026-11-03T14:18:11","slug":"near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection","status":"publish","type":"articles","link":"https:\/\/insulation.org\/io\/articles\/near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection\/","title":{"rendered":"Near-Ambient Process Lines: An Alternative Solution for CUI Mitigation and Freeze Protection"},"content":{"rendered":"\n

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Corrosion under insulation (CUI) is one of the most persistent and costly maintenance challenges facing industrial facilities. CUI can remain hidden long enough for significant damage to develop before detection, ultimately shortening pipeline service life, reducing thermal efficiency, and increasing safety risks. <\/p>\n\n\n\n

While CUI in high-temperature systems has received much of the attention from industry research and product development, near-ambient and slightly below-ambient process lines have mostly been overlooked. These applications present unique challenges because the conditions affecting moisture egress differ significantly from those in high-temperature systems. As a result, they may require a different approach to CUI mitigation. <\/p>\n\n\n\n

Many near-ambient, and even some slightly below-ambient, process lines use vapor-permeable insulation materials that rely on their breathability to provide a means for \u201cdrying out\u201d moisture that infiltrates the system. However, in near-ambient service conditions, the temperature differential, or vapor drive, necessary to perform that drying process may be limited or absent altogether. <\/p>\n\n\n\n

In these cooler applications, not only is the vapor drive insufficient and therefore unable to drive out moisture that has infiltrated the insulation system, but moisture actually could be directed towards the cooler pipe or vessel surface, bringing in moisture or wetting the system instead of drying it. Ironically, the very breathability of the insulation materials advertised to help mitigate CUI could contribute to CUI instead. To understand why these systems are vulnerable, it is useful to separate two related questions: how moisture enters the insulation system, and what happens after it gets inside. <\/p>\n\n\n\n

How Moisture Ingress Occurs<\/strong> <\/h2>\n\n\n\n

In many near-ambient insulation systems that use vapor-permeable insulation materials, caulking provides the primary seal against liquid water ingress at jacket seams, terminations, and penetrations. Even small openings can provide a pathway for such ingress.  <\/p>\n\n\n\n

Over time, moisture can infiltrate through weak points or any penetration\/breach within the insulation system. These weak points can include the following: <\/p>\n\n\n\n

    \n
  • Caulking degradation:<\/strong> As caulking ages over time, or due to UV exposure, it will harden and separate, or lose adhesion. Most feedback from the field indicates that even undamaged caulking may only last 6 months to 2 years. <\/li>\n<\/ul>\n\n\n\n
      \n
    • Inadequate caulking amounts and installation technique:<\/strong> Many installers are trained to apply caulking in the smallest amount possible, frequently leaving less than the \u00bc\u201d bead that is usually called for. Making matters worse still is that installers typically smooth the caulking that has been applied, leaving a very thin layer.  <\/li>\n<\/ul>\n\n\n\n
        \n
      • Exceeding the movement capability of the caulking:<\/strong> When the caulking has a soft insulation material underneath, any mechanical compression will stretch the movement capability of the caulking, which may already have hardened or was applied thinly. <\/li>\n<\/ul>\n\n\n\n
          \n
        • Jacketing breaches:<\/strong> Whether due to natural causes or human activity, punctures, open seams, and damages to the jacketing will present pathways that allow moisture ingress into the insulation system. Where soft insulation provides limited support beneath the jacketing, mechanical contact can make these breaches more likely. <\/li>\n<\/ul>\n\n\n\n
            \n
          • Geometry that is challenging to seal:<\/strong> Sharp angles (e.g., any angle iron steel profile) may be more difficult to seal than gently curved circular profiles. These locations often depend on narrow caulk joints, overlapping jacketing, or field-fabricated details that may have poor fit.  <\/li>\n<\/ul>\n\n\n\n

            If any of the details listed are not adequately sealed or maintained, they can provide pathways for liquid water or water vapor to enter the insulation system. While watershed jacketing techniques may be generally effective against moisture ingress in the form of liquid water (rain, washdown water, etc.), these techniques will not be effective in preventing moisture ingress in the form of vapor, which will move as a result of vapor drive to the cool metal surfaces common in these near- and slightly below-ambient applications. <\/p>\n\n\n\n

            It is important to note that when defending against ingress of moisture in the form of vapor, due to vapor drive toward a cool surface, any feature of the insulation system that allows the passage of moisture can allow moisture ingress yet not egress. This does not just apply to vapor permeability of the insulation material itself, but also any accessories intended to facilitate drainage of moisture. <\/p>\n\n\n\n

            With so many details presenting entry points for moisture infiltration, it makes sense to consider a sealed insulating system designed to minimize the risk of moisture ingress. Later in this article, we will look at how a sealed system offers a preventative approach to safeguard against moisture infiltration. <\/p>\n\n\n\n

            What Happens after Moisture Gets Inside<\/strong> <\/h2>\n\n\n\n

            Once moisture infiltrates an insulation system, its subsequent movement and retention will depend on the properties of the insulation material, system design, and operating temperature. Vapor-permeable insulation materials can allow incidental moisture to dry over time in applications with elevated process temperatures where heat from the process can create sufficient vapor drive to move moisture outward. <\/p>\n\n\n\n

            Near-ambient and slightly below-ambient process lines behave differently. Because these systems operate with limited to no temperature differential between the process line and the surrounding environment, the driving force necessary for evaporation and drying may be significantly reduced, absent, or, even worse, the vapor drive could be directed toward the pipe or vessel surface. With no heat to help dry the system, moisture that enters the insulation system can remain trapped for extended periods rather than being driven out of the insulation system. This leads to a host of issues for these applications. <\/p>\n\n\n\n

              \n
            • Settling:<\/strong> Once inside, if the temperature is low enough, moisture may migrate through a vapor-permeable insulation system, condense, and settle at low points. <\/li>\n<\/ul>\n\n\n\n
                \n
              • Widespread CUI damage over large areas: <\/strong>The lack of compartmentalization in vapor-permeable insulating systems means that a single point of moisture ingress can lead to widespread damage, as water can travel over large distances before reaching the low point. As a result, moisture damage and CUI may extend beyond the original breach and affect a broader area.  <\/li>\n<\/ul>\n\n\n\n
                  \n
                • Moisture accumulation inside the insulation material: <\/strong>Moisture can accumulate in the physical voids inside the vapor permeable material, even if its hydrophobicity has not been compromised (see Photos 1<\/em> and 2<\/em>). An industry trend has been to recommend hydrophobicity of a vapor-permeable insulation material as a defense against liquid water ingress. However, under certain temperature and moisture content conditions, water vapor can condense within vapor permeable insulation and be trapped in these voids. <\/li>\n<\/ul>\n\n\n\n
                  \"\"<\/figure>\n\n\n\n

                  Why Retained Moisture Creates Both CUI and Freeze Protection Problems<\/strong> 
                  Thermal Performance, Heat Tracing, and Freezing<\/strong> <\/h3>\n\n\n\n

                  Water retention does more than increase corrosion risk. It also changes the thermal behavior of the insulation system. <\/p>\n\n\n\n

                  Water conducts heat more effectively than air, meaning water in an insulation material allows greater heat transfer through the system. When water is retained within an insulation system, thermal performance can degrade quickly and dramatically. 
                  Data clearly indicates large negative effects on thermal conductivity with elevated moisture content. Studies on open-cell insulation materials have shown that a 1% increase in water content can result in a 23% increase in thermal conductivity. 1<\/sup> <\/p>\n\n\n\n

                  It is the near-ambient systems that most often require heat tracing, either for freeze protection or to maintain safe operating temperatures (e.g., to allow heavier fluids to flow more easily). Heat-tracing systems are designed to compensate for normal heat loss through a dry insulation system, but water-saturated insulation can dramatically increase heat loss from the line. As the thermal performance of the insulation system drastically declines due to water content, the heat-tracing systems may need to operate more frequently or at higher output levels to maintain process temperatures.  <\/p>\n\n\n\n

                  If the additional heat loss exceeds the heat-tracing system\u2019s capacity, temperatures may fall more rapidly during cold-weather events, increasing the potential for freezing within vulnerable systems. This increase in energy demand can also raise operating costs and contribute to higher overall emissions. In severe cases, the additional thermal losses may exceed the heat-tracing system\u2019s design capacity. <\/p>\n\n\n\n

                  In addition to potential pipe damage, freezing events can pose safety risks, interrupt operations, delay production schedules, and increase maintenance demands across a facility. <\/p>\n\n\n\n

                  Corrosion and Asset Degradation<\/strong> <\/h3>\n\n\n\n

                  No matter the cause, persistent moisture retention within an insulation system can accelerate the deterioration of both the insulation and the underlying asset.  <\/p>\n\n\n\n

                  Without regular inspection and maintenance, corrosion can progress beneath the insulation, and facilities may require more frequent repairs and insulation replacement. These remediation demands often extend beyond the affected piping, as damaged jacketing, degraded caulking, compromised fittings, and wet insulation materials may all require replacement over time.  <\/p>\n\n\n\n

                  Because CUI often remains hidden until inspections identify it or failures occur, facilities may be forced to address problems reactively rather than proactively. In critical systems, these interruptions can result in unplanned downtime and reduced throughput. <\/p>\n\n\n\n

                  These combined risks point to a design question: If near-ambient lines cannot reliably dry after moisture enters, should the insulation strategy focus more heavily on preventing moisture entry in the first place? <\/p>\n\n\n\n

                  Addressing Failure Mechanisms<\/strong> <\/h2>\n\n\n\n

                  Because near-ambient processes inherently lack the operational thermal energy required to drive out moisture and dry a vapor-permeable insulation system, limiting moisture ingress in both liquid and vapor forms becomes an essential strategy. Specifying an impermeable, closed-cell cellular glass insulation system that complies with ASTM C552 \u2013 Standard Specification for Cellular Glass Insulation provides a barrier against these mechanisms. Tested in accordance with ASTM E96, cellular glass exhibits a water vapor permeability of 0.00 perm-in. Furthermore, it qualifies as non-wicking and moisture resistant under ASTM C240 (surface-only water retention <0.5% by volume), avoiding the thermal conductivity consequences associated with wet insulation. <\/p>\n\n\n\n

                  That impermeability also changes how vulnerabilities can be addressed. Supports, penetrations, fittings, and other transitions that were difficult to seal when using vapor permeable insulation materials can be more reliably sealed. Rather than only sealing the metal jacketing where it terminates, a full depth can be created across the entire thickness of the insulation material, creating a more durable and reliable barrier against moisture entry, even in vapor form. <\/p>\n\n\n\n

                  Cellular glass\u2019 dimensional stability also helps support the integrity of those seals over time. It does not shrink, retaining its original dimensions for decades, avoiding the formation of gaps that could facilitate moisture ingress in the sealed system. The high compressive strength of cellular glass also supports the jacketing and allows the insulation system to resist mechanical forces that could create the openings that allow moisture ingress. <\/p>\n\n\n\n

                  Even if moisture ingress does occur, due to localized damage, the closed-cell structure of cellular glass limits its ability to migrate through the insulation system. Unlike vapor permeable fibrous insulation materials that allow water vapor to travel large distances, a cellular glass system has compartmentalization inherently built into the design. Any moisture that does enter will only be able to travel as far as the next piece of sealed insulation, drastically limiting the extent of moisture exposure. <\/p>\n\n\n\n

                  A fully sealed cellular glass system is designed to prevent lateral moisture migration along the insulation-to-substrate interface. Joints are sealed with a proprietary sealant to isolate each segment (see Photos 3 <\/em>and 4<\/em>). <\/p>\n\n\n\n

                  \"\"<\/figure>\n\n\n\n

                  Cellular glass insulation systems can also be configured to accommodate heat tracing through purpose-designed spacers. The spacers provide room for heat tracing underneath the insulation, while maintaining system continuity and reducing the need for improvised field modifications that could introduce additional moisture pathways.  <\/p>\n\n\n\n

                  By controlling moisture ingress while preserving thermal performance, the same system can support both CUI mitigation and freeze-protection requirements. <\/p>\n\n\n\n

                  Case Study: Near-Ambient Fuel Gas Lines at a Canadian Oil Sands Facility<\/strong> <\/h2>\n\n\n\n

                  One example comes from a Canadian oil sands facility, where operators encountered liquid moisture saturation in the vapor-permeable insulation material installed on ambient fuel gas lines after one winter season. Over a short period of time, moisture in the form of vapor infiltrated the insulation system due to failed caulking at the jacketing. The moisture became trapped inside the insulation system. In addition, in the extreme cold temperatures of a Northern Alberta winter, condensation formed on the surface. Without any heat to dry the system, the insulation became saturated. The insulation was never exposed to any elevated process temperature and was still hydrophobic, demonstrating that hydrophobicity cannot prevent moisture from accumulating within the physical voids inside a vapor-permeable insulation material. <\/p>\n\n\n\n

                  To address the issue, the facility replaced the original insulation with an impermeable, sealed cellular glass insulation system. Owens Corning provided on-site installation training and support, ensuring proper installation. After the winter season, the successful result prompted the operator to begin conversion to the sealed cellular glass system for fuel gas lines across all of their facilities.  <\/p>\n\n\n\n

                  The project highlighted the importance of evaluating vapor drive and long-term moisture behavior in near-ambient insulation systems, rather than relying solely on declared service temperature ranges. The experience also demonstrated how quickly moisture retention can compromise a near-ambient system when drying potential is limited. <\/p>\n\n\n\n

                  Conclusion<\/strong> <\/h2>\n\n\n\n

                  By limiting vapor movement, reliably sealing vulnerable details, restricting moisture migration, and accommodating heat tracing, a cellular-glass sealed system can support both CUI mitigation and freeze protection over the service life of the system. <\/p>\n\n\n\n

                  SOURCE<\/strong> <\/p>\n\n\n\n

                    \n
                  1. Kehrer, et al., 2002; Cremaschi, Cai, Ghajar, et al., 2012; Jerman and Cerny, 2012 <\/li>\n<\/ol>\n\n\n\n
                      \n
                    1. <\/li>\n<\/ol>\n\n\n\n

                      <\/p>\n","protected":false},"excerpt":{"rendered":"

                      Protecting near- and slightly below-ambient systems from the threats of CUI and freezing temperatures requires consideration of how moisture can get into and out of an insulation system, the effects of vapor drive, and how materials can best be used to address these points. <\/p>\n","protected":false},"author":[760],"featured_media":0,"template":"","categories":[26,758],"class_list":["post-15296","articles","type-articles","status-publish","hentry","category-corrosion","category-october-2026","author-fadi-bachir"],"acf":[],"yoast_head":"\nNear-Ambient Process Lines: An Alternative Solution for CUI Mitigation and Freeze Protection - Insulation Outlook Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/insulation.org\/io\/articles\/near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Near-Ambient Process Lines: An Alternative Solution for CUI Mitigation and Freeze Protection\" \/>\n<meta property=\"og:description\" content=\"Protecting near- and slightly below-ambient systems from the threats of CUI and freezing temperatures requires consideration of how moisture can get into and out of an insulation system, the effects of vapor drive, and how materials can best be used to address these points.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/insulation.org\/io\/articles\/near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Insulation Outlook Magazine\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-03T14:18:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/insulation.org\/io\/wp-content\/uploads\/sites\/3\/2026\/10\/IO261004_01.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1788\" \/>\n\t<meta property=\"og:image:height\" content=\"1141\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/insulation.org\/io\/articles\/near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection\/\",\"url\":\"https:\/\/insulation.org\/io\/articles\/near-ambient-process-lines-an-alternative-solution-for-cui-mitigation-and-freeze-protection\/\",\"name\":\"Near-Ambient Process Lines: An Alternative Solution for CUI Mitigation and Freeze Protection - 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