Isolation Gasket with Metallic Core and Dielectric Seal
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Solution Overview
Problem
Seal systems for high-pressure, high-temperature, and corrosive environments face challenges in maintaining electrical isolation and preventing leakage, especially during fires, as conventional materials deform or conduct electricity, and fail to contain media effectively.
Innovation Solution
A metallic core with bonded dielectric material and a spring-loaded PTFE ring provides electrical isolation, with a metal core backup seal and compression limiter to prevent leakage, utilizing grooves and seals in a gasket design that includes a primary and secondary seal element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional seal materials are used for high pressure applications, then sealing capability is improved, but electrical isolation is lost because the materials conduct electricity
Solution Approach 1:
The gasket combines a metallic core (stainless steel or Inconel) with a non-conductive elastomeric material (Viton or similar). The metal core provides the necessary mechanical strength and sealing capability for high pressure applications, while the elastomeric material bonded to at least one surface provides electrical isolation. This composite structure resolves the contradiction by integrating materials with complementary properties.
2Reliability
If materials resistant to corrosive gases are used, then corrosion resistance is improved, but the materials deform under high pressure
Solution Approach 1:
The gasket uses a metal core made of corrosion-resistant materials such as stainless steel or Inconel, which provides both corrosion resistance and the mechanical strength to resist deformation under high pressure. The elastomeric material is bonded to the metal core, combining the benefits of chemical resistance from the metal with the sealing properties of the elastomer.
3Reliability
If traditional seal materials are used, then sealing function is maintained, but the seal fails during fire because materials melt at high temperatures
Solution Approach 1:
The metal core provides high temperature stability and maintains structural integrity during fire conditions, while the elastomeric material provides sealing function at normal operating temperatures. The composite structure allows the gasket to maintain sealing capability across a wide temperature range, including fire conditions where traditional polymer seals would melt.
4Reliability
If electrical isolation is prioritized using non-conductive materials, then electrical isolation is improved, but sealing capability under high pressure deteriorates
Solution Approach 1:
The gasket uses a metal core that provides the necessary mechanical strength for high pressure sealing, with an elastomeric material bonded to the surface that provides both electrical isolation and sealing enhancement. This configuration ensures that the non-conductive properties are achieved without compromising the pressure sealing capability.
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 maintains a seal under high pressure and high temperatures, ensuring electrical isolation and containing media during fires by using a metal core backup seal and compression limiter, preventing over-compression and maintaining bolt load.
Implementation Method 1
a layer of dielectric material disposed on one or both of the opposing side surfaces
Implementation Method 2
a springloaded polytetrafluoroethylene (PTFE) ring
Data Source
Figure 1
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AI summary
Sealing systems for high pressure applications that provide electrical isolation between joined elements as well as enhanced resistance to leakage of media during a fire are provided.