Passivating Insulation Blanket for Corrosion Under Insulation
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Solution Overview
Problem
Corrosion under insulation (CUI) remains a significant issue in facilities due to moisture intrusion, leading to equipment degradation despite preventative measures, especially in high-temperature applications where water penetrates insulation and collects between the insulation and metal surfaces, causing localized corrosion and stress corrosion cracking.
Innovation Solution
A passivating flexible insulation blanket with a hydrophobic insulation core and a non-consumable passivator, including high solubility silicate ions and a carrier, is used to form a protective coating on metal surfaces, neutralizing acidic components and inhibiting corrosion by encapsulating the insulation core in a fabric to create a barrier against environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulation blankets are used without passivator, then installation is simpler and cost is lower, but corrosion protection is insufficient
Solution Approach 1:
The patent combines the insulation function and corrosion protection function into a single integrated blanket assembly. The passivator-containing layer is incorporated directly into the blanket structure, merging what would traditionally be separate components (insulation material and corrosion protection coating) into one unified product that simultaneously provides both functions.
Solution Approach 2:
The blanket assembly uses composite material construction with multiple layers having different properties. The outer layer contains passivator agents mixed with insulation material, creating a composite structure where each layer contributes specific functions (thermal insulation, corrosion inhibition, moisture barrier) to achieve overall system performance that neither material could provide alone.
2Object-affected harmful factors
If moisture barrier measures are taken, then moisture intrusion is reduced, but water still penetrates and collects under insulation in high-temperature applications
Solution Approach 1:
The passivator layer is applied to the metal surface before insulation installation, creating a protective barrier in advance. This preliminary action ensures that if water does penetrate the insulation later, the corrosive effects are neutralized by the pre-applied passivator, preventing corrosion even when moisture intrusion occurs.
Solution Approach 2:
The patent converts the harmful effect of water penetration into a beneficial process. When water infiltrates the insulation and reaches the passivator layer, it activates the passivator agents to leach out and form protective corrosion-resistant layers on the metal surface. The water that would normally cause corrosion instead triggers the formation of protective barriers.
3Reliability
If passivator is deposited in insulation material, then corrosion inhibition is enhanced, but manufacturing complexity increases
Solution Approach 1:
The passivator agents are mixed into the insulation material during the manufacturing process, performing the corrosion protection preparation in advance. This preliminary incorporation eliminates the need for separate field application steps and ensures uniform distribution of passivator throughout the insulation layer, simplifying overall installation while maintaining effective corrosion protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces corrosion formation, enhances pH buffering, and minimizes moisture intrusion, providing superior corrosion inhibition and reducing installation time and costs while maintaining effectiveness over the lifespan of the insulation blanket.
Implementation Method 1
a non-consumable passivator, including high solubility silicate ions and a carrier, is used to form a protective coating on metal surfaces, neutralizing acidic components and inhibiting corrosion
Implementation Method 2
a hydrophobic insulation core
Data Source
AI summary
A passivating flexible insulation blanket positionable about a pipe includes an insulation core, an enclosing fabric, and a non-consumable passivator. The insulation core is substantially hydrophobic and includes a microporous material. The enclosing fabric fully encapsulates the insulation core to form a capsule or pouch about the insulation core. The non-consumable passivator is non-consumable such that there is no appreciable change to a mass of the non-consumable passivator after an extended time of activation. The non-consumable passivator is deposited into the insulation core and has a composition soluble in water. The non-consumable passivator includes a leachable component that leaches from the insulation core and is capable of neutralizing acidic components. The leachable component is water soluble and is capable of reacting with a surface of the pipe to form a protective coating on the pipe to aid in inhibiting corrosion formation on the surface of the pipe.