Suction Pile Vent Cap Sealing Design
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Solution Overview
Problem
Existing vent cap systems for suction piles face challenges in cost efficiency, durability, and force required to maintain a seal, particularly in limited spaces and under varying pressures, with weld deformation affecting the entire flange assembly and requiring additional components for alignment and support.
Innovation Solution
A vent cap system comprising a top plate, center stem assembly, bottom plate, and perimeter stem assemblies, where the bottom plate moves between open and closed positions with a friction fit closing lip and sealing engagement, using a smaller sealing diameter and larger welding diameter to isolate deformation and reduce force requirements, and eliminating the need for separate guidance components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flange assembly uses a larger welding diameter to improve welding strength, then the welding connection to the suction pile is stronger, but the weld deformation affects the entire flange assembly including the sealing portion
Solution Approach 1:
The flange assembly is segmented into a sealing portion and a welding portion, allowing independent optimization of each function. The sealing portion maintains precise alignment for sealing while the welding portion accommodates larger welding diameter and deformation without affecting sealing integrity.
Solution Approach 2:
The sealing function is extracted from the welding area by creating a separate sealing portion that is isolated from the welding deformation zone. This allows the welding portion to use larger diameter for strength while the sealing portion maintains manufacturing precision.
2Reliability
If additional components are added to maintain alignment and support the bottom plate, then alignment and sealing reliability are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The alignment and support functions are merged into the flange assembly structure itself through the segmented design. The flange assembly inherently provides both sealing surface and structural support without requiring separate alignment components.
Solution Approach 2:
The flange assembly is designed as a multi-functional component that simultaneously provides sealing, alignment, and structural support functions. This eliminates the need for additional dedicated components for each function.
3Reliability
If the sealing diameter is increased to improve sealing contact area, then sealing reliability is improved, but the force required to maintain the seal increases
Solution Approach 1:
The sealing portion is designed with optimized local geometry that concentrates sealing pressure at critical contact points rather than distributing it over a larger area. This maintains reliable sealing with reduced overall force requirements.
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 system achieves improved cost efficiency, reduced force for sealing, and enhanced durability by minimizing the impact of weld deformation on the sealing portion, allowing for efficient operation in limited spaces with reduced material usage and fewer components, while maintaining alignment and securing the seal effectively.
Implementation Method 1
the perimeter stem assemblies and stem retainer cooperate to maintain alignment of the bottom plate relative to the flange assembly during movement between opened position and closed position
Implementation Method 2
The closing lip abuts the flange assembly due to the larger diameter of the closing lip. This friction fit relationship of the closing lip and the flange assembly stops bottom plate movement, when exterior top pressure is applied to the vent cap system.
Data Source
AI summary
The vent cap system for a suction pile includes a top plate, a center stem assembly, a bottom plate, a flange assembly, and perimeter stem assemblies. The bottom plate moves between an opened position and a closed position. The center stem assembly is in direct threaded engagement with the top plate, and the perimeter stem assemblies and stem retainer cooperate to maintain alignment of the bottom plate. A pipe plug to test the sealing engagement is placed on the bottom plate, instead of the flange assembly. There is a closing lip of the bottom plate so that a sealing diameter can be the smallest diameter of the flange assembly, which reduces force on the bottom plate from under the bottom plate. There is a connection portion of the flange assembly to attach the system to the suction pile so that weld deformation does not affect the entire flange assembly.