Does insulation cause corrosion?
Does insulation cause corrosion?
Corrosion beneath insulation (CUI), a problem that occurs when moisture builds up under an insulating layer, is well-documented in plants. Substrates underneath insulation may be susceptible to several types of corrosion depending on how the insulation materials and the moisture source are made.
- Galvanic corrosion
- Acidic corrosion
- Alkaline corrosion
- Chloride corrosion
These processes can cause severe damage to pipes and containers. This can lead to leaks or holes that can shut down entire facilities.
CUI is not immune to any combination of insulation and metal. Therefore, it is important to ensure that you maintain your home well. However, there are some solutions that can reduce the risk. These include insulation that is easily removable and replaced for routine repair and assessment.
The Problem: Causes & Consequences Of CUI
CUI can happen under many circumstances, which is part of the problem in preventing it. Some factors that could increase the risk include:
- Condensation can form in an environment that is constant at temperatures above freezing, but below boiling.
- Substandard insulation that is corrosive or rapidly degrades.
- Insulation that is too close to water sources.
CUI is most likely to occur when certain chemicals react with the metal's surfaces and cause it to lose its structure. This could take many forms depending on which compounds are present. This could be:
- Galvanic corrosion occurs when insulation is moistened by either an electrolyte, or a salt. This can lead to serious surface damage by allowing a current to flow between the insulation and the metal surface.
- Problems can also arise from the presence of acidic or strongly basic substances. Granular insulations can absorb both water and an acid. This can lead to acidic or alkaline corrosion.
- A lot of the corrosion can be caused by chloride, whether it comes from industrial processes or from natural sources. Even though the equipment does not contain any harsh chemicals, chemical corrosion can still occur. For example, chloride can be found in rainwater.
Although each category of CUI is caused by different factors, any corrosive damage can be exacerbated by permanent or rigid insulation. Technicians should be able remove insulation regularly to check for wear in the underlying metal. Inadequate removal can cause chemical damage that will compound and render the vessel irreparable.
The Answer to CUI
CUI can be solved by replacing rigid insulation with removable solutions. It is much easier to monitor the condition of the process piping and avoid causing further damage to the surface.
These investments have many benefits. The benefits of using removable insulation are numerous. It makes routine inspections and maintenance much easier. It also allows for easier repairs. Permanent insulation can be difficult to replace without damaging the pipes, but removable covers are easy to remove from individual pieces of machinery and process piping when they begin to fall apart. This can save you a lot of money over the life expectancy of your equipment.
GIS Insulation Solutions
GIS insulation’s removable insulation cover is designed for ease of use without compromising performance. For a tight fit that repels moisture, our covers adhere tightly to the vessel or piping. This excellent fit is not available in lower quality blankets. It can lead to corrosion, rather than preventing it.
