Through-Wall Composite Vessel Fitting for End Grain Sealing
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Solution Overview
Problem
Composite vessels with through-wall penetrations are susceptible to fluid and external contaminants wicking into the exposed end grain, leading to reduced strength and potential delamination, which is not adequately addressed by conventional molding processes.
Innovation Solution
A composite vessel fitting with a sealing surface arrangement that includes outer and inner seals to prevent fluid and contaminant migration, using structural parts that form a clamp to exert forces on the composite vessel surfaces, ensuring secure engagement and protection of the end grain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a through-wall penetration is created in a composite vessel, then access to fluid is enabled, but the exposed end grain allows fluid and contaminants to wick into the composite, reducing strength
Solution Approach 1:
A fitting is introduced as an intermediary component between the external environment and the composite vessel wall. The fitting includes sealing surfaces that contact the composite and sealing elements (such as gaskets or O-rings) that prevent fluid and contaminant migration into the exposed end grain, thereby protecting composite strength while enabling fluid access
Solution Approach 2:
Flexible sealing elements such as elastomeric gaskets or O-rings are used to create fluid-tight barriers at the penetration interface. These flexible seals conform to the sealing surfaces and prevent wicking of fluid and contaminants into the composite end grain, maintaining structural integrity while allowing penetration functionality
2Strength
If molding process is used to cover end grain with resin rich layer, then protection is provided, but positional accuracy requirements are not met
Solution Approach 1:
The protection function is segmented into two independent components: the molding process provides general end grain coverage with resin-rich material, while a separate post-machining fitting provides precise positional sealing. This segmentation allows each process to optimize for its respective function without compromise
Solution Approach 2:
The molding process performs preliminary protection by covering the end grain with resin-rich material during vessel fabrication. Subsequently, a fitting is installed to provide precise positional sealing, building upon the preliminary protection without requiring the molding process to achieve final precision
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 fitting effectively seals against the composite vessel, preventing fluid leakage and external contamination, maintaining structural integrity and enhancing serviceability without destructive removal.
Implementation Method 1
a seal configured to restrict fluid from the vessel migrating to the end grain
Implementation Method 2
an outer seal arrangement including at least one outer seal having a first sealing surface, in which the outer seal arrangement is configured to cooperate with the outer part such that the first sealing surface sealingly engages the outer surface of the composite vessel to restrict migration of environmental contaminants to the end grain
Data Source
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AI summary
A composite vessel and fitting for a through-wall penetration having an exposed end grain. The fitting includes a sealing surface arrangement that seals against the composite vessel and prevents leakage of the vessel contents while protecting the end grain from exposure to internal fluid and/or external environment. The fitting includes an outer part, an inner part, and a through-wall part extending between the inner and outer parts across the penetration. An outer seal arrangement includes an outer seal having a first sealing surface that seals against the outer surface of the composite vessel to restrict environmental contaminants migrating to the end grain. An inner seal arrangement includes at least one inner seal having second and third sealing surfaces. The second sealing surface seals against the inner surface of the composite vessel and the third sealing surface seals a leak path or interface between the inner part and through-wall part to restrict internal fluid migrating to the end grain.