Expandable Graphite Seal for High-Temperature Corrosive Environments
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Solution Overview
Problem
Elastomers used in sealing applications in high-temperature, high-pressure, and corrosive environments, such as in hydrocarbon recovery and carbon dioxide sequestration, tend to degrade, necessitating a more reliable sealing solution.
Innovation Solution
A seal arrangement utilizing expandable graphite, which is positioned within a cavity and expands to engage with both the body and structure surfaces, providing a resilient compressive seal that conforms to imperfections and maintains sealing even under volume changes, optionally enhanced by a second compressible member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomers are used to seal members, then sealing ability on rough surfaces is improved, but reliability under high temperature and high pressure deteriorates
Solution Approach 1:
The patent changes the material parameter from elastomer to graphite, which has superior high-temperature resistance while maintaining sealing capabilities through its unique expansion and deformation properties under pressure
Solution Approach 2:
The invention uses a composite sealing structure combining graphite material with a metal body, creating a composite system that leverages the high-temperature stability of graphite and the structural strength of metal
2Reliability
If elastomers are used to seal members, then sealing ability on rough surfaces is improved, but durability in corrosive environments deteriorates
Solution Approach 1:
The patent changes the material parameter from elastomer to graphite, which exhibits superior chemical inertness and corrosion resistance while maintaining the ability to seal against rough surfaces through its deformation characteristics
3Adaptability or versatility
If graphite is expanded to seal surfaces, then adaptability to surface imperfections is improved, but device complexity increases
Solution Approach 1:
The graphite seal performs self-adjustment through its own expansion and deformation under pressure, automatically conforming to surface imperfections without requiring external adjustment mechanisms or complex control systems
4Force
If graphite is compressively maintained within the cavity, then sealing pressure is improved, but manufacturing complexity increases
Solution Approach 1:
The graphite is pre-positioned within the cavity during manufacturing, and the compressive force mechanism is pre-configured, allowing the sealing system to be assembled in a straightforward manner without requiring complex installation procedures
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 expandable graphite effectively seals surfaces with imperfections and maintains sealing pressure across varying conditions, offering improved durability and resistance to degradation in harsh environments.
Implementation Method 1
The graphite 14 is volumetrically expandable in response to specific changes in environment such as changes in temperature
Implementation Method 2
The graphite 14 is deformable such that it conforms to troughs 42, peaks 46 and other imperfections in the surface 38 creating a seal
Implementation Method 3
The graphite 14 is configured to plastically deform at loads below where it elastically deforms. And it is the plastic deformation that allows the graphite 14 to contour to the surface 38
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A seal arrangement includes a body having at least two walls defining a cavity, the walls are engagable with at least one structure through expansion of the body, and graphite is sealingly engaged with the body and the structure and resiliently compressively maintained within the cavity by the at least one structure.