Compression Limiting Manway Gasket Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing railroad tank car manway gaskets face challenges in maintaining effective sealing while avoiding excessive deformation or physical damage during the attachment of the manway cover to the nozzle, particularly when handling hazardous chemicals, and current solutions are cumbersome and costly.
Innovation Solution
A resilient gasket body with compression limiting inserts, made of rigid materials like stainless steel or carbon fiber composite, is integrated into the gasket design, spaced at intervals aligned with the tightening bolts to prevent excessive deformation and physical damage, allowing for sufficient resilient deformation without applying destructive compressive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid ring of metal is employed as a carrier for a resilient multi-component seal element, then compression limiting capability is achieved to prevent excessive deformation, but the product becomes cumbersome and expensive
Solution Approach 1:
The patent extracts the compression limiting function from a separate rigid metal ring carrier and integrates it directly into the resilient gasket body through molded-in reinforcement ribs. This eliminates the need for a separate carrier structure while maintaining the compression limiting capability, thereby reducing device complexity and cost.
Solution Approach 2:
The patent merges the compression limiting function with the resilient gasket body by integrating reinforcement ribs directly into the gasket structure. The reinforcement ribs are molded as part of the gasket body, combining the sealing function and compression limiting function into a single integrated component, which reduces the number of parts and assembly complexity.
2Reliability
If compression limiting inserts are integrated into the resilient gasket body, then excessive deformation is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses composite construction by integrating rigid reinforcement ribs (made from rigid or semi-rigid material) within the resilient gasket body (made from elastomeric material). This composite structure allows the gasket to maintain resilience for sealing while the rigid ribs provide compression limiting, achieving deformation control without requiring separate manufacturing steps for the inserts.
Solution Approach 2:
The compression limiting reinforcement ribs are pre-integrated into the gasket body during the molding process, rather than being added as separate components during assembly. This preliminary integration simplifies the overall manufacturing process by combining multiple functions into a single molding operation, reducing both manufacturing complexity and assembly steps.
3Reliability
If the gasket allows sufficient resilient deformation, then effective sealing is achieved, but excessive compressive forces may cause physical damage
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs at specific locations within the gasket body where compression forces are most critical. The ribs are strategically positioned to provide localized structural support and compression limiting exactly where needed, while allowing other areas of the gasket to remain highly resilient for effective sealing. This localized reinforcement achieves deformation control without compromising sealing effectiveness.
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 limits compression and deformation, ensuring a reliable fluid-tight seal while reducing the risk of physical damage and operational costs, thus enhancing the longevity and effectiveness of the gasket in sealing the cover-to-manway nozzle joint.
Implementation Method 1
a resilient gasket body with compression limiting inserts... permitting sufficient resilient gasket deformation without application of excessive or destructive compressive forces
Data Source
AI summary
A gasket for sealing between the open end of a manway nozzle body of a containment vessel and an associated cover comprising a resilient annular ring member having a bail including a plurality of rigid arcuate inserts spaced about the bail that extends between radially inner and radially outer depending legs. The bail includes at least one annular upstanding chevron extending about an upper surface and at least one annular depending chevron extending about a lower surface. The inserts and bail have about the same thickness. A method includes compressing the gasket between the manway nozzle and cover, and the rigid inserts limit the compression of the gasket.