Rigid Entry Fitting With Replaceable Seals for Double-Walled Sumps
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Solution Overview
Problem
Conventional penetration fittings for underground storage tank fueling sites have components with low chemical resistance that degrade quickly in harsh environments, requiring excavation for replacement and are not suitable for double-walled sumps that enable pressure testing and monitoring of seal integrity.
Innovation Solution
A rigid entry fitting with a tapered design, including a fitting body, insert, shell, and nut, which forms multiple fluid-tight seals around a pipe segment and sump wall, allowing for easy replacement of gaskets without excavation and enabling pressure testing and monitoring through radial openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional penetration fittings with low chemical resistance materials are used, then the sealing function is provided, but the components degrade quickly in harsh sump environments
Solution Approach 1:
The entry fitting employs a composite construction combining chemically resistant materials (such as PTFE or stainless steel) for components in direct contact with fuel, paired with structurally sound materials for the fitting body. This multi-material approach ensures both chemical resistance and mechanical strength, preventing degradation in the harsh sump environment while maintaining sealing integrity over extended service life.
2Ease of repair
If conventional penetration fittings are used, then sealing is achieved, but excavation is required to replace worn components
Solution Approach 1:
The entry fitting is divided into separable modules: a removable fitting body portion containing the sealing components, and a permanent sump wall portion. The segmented design allows the fitting body and gaskets to be detached and replaced independently through the existing aperture without requiring excavation of the backfill area, significantly improving maintenance accessibility while keeping the sealing function intact.
Solution Approach 2:
The fitting incorporates dynamic, movable components including a adjustable positioning mechanism that allows the fitting body to be inserted, positioned, and removed through the sump wall aperture. This dynamic design enables maintenance personnel to access and replace worn sealing components from the outside without excavation, making the system adaptable to maintenance needs while preserving the seal.
3Adaptability or versatility
If conventional penetration fittings are used, then basic sealing is provided, but they are not configured for double-walled sumps that enable pressure testing
Solution Approach 1:
The entry fitting is designed with multi-functionality to serve both single-walled and double-walled sump configurations. It includes integrated pressure equalization ports and sealing surfaces that accommodate pressure testing requirements, while maintaining basic sealing capability for standard applications. This universal design allows the same fitting to adapt to different sump types without compromising seal integrity or monitoring capability.
Solution Approach 2:
The fitting incorporates an intermediary pressure equalization chamber and communication path between the inner and outer walls of double-walled sumps. This intermediary structure enables pressure testing by allowing pressure to be applied and monitored across the sealing interface, providing a mechanism to verify seal integrity while maintaining the primary sealing function for fuel containment.
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 rigid entry fitting provides durable, chemically resistant seals that prevent fuel leakage and allow for non-invasive maintenance and integrity testing of the sump system, enhancing environmental protection and operational efficiency.
Implementation Method 1
the nut is configured to press the shell and the insert into the tapered opening of the fitting body, and press the first pair of gaskets against the inner surface of the fitting body and the second pair of gaskets against the outer surface of the pipe segment
Data Source
AI summary
A rigid entry fitting configured to form a seal between a flexible pipe segment and a sump wall includes a fitting body having an inner surface defining a tapered opening, an insert received in the tapered opening, a shell received in an opening of the insert, a first pair of gaskets between an outer surface of the insert and the inner surface of the fitting body, a second pair of gaskets contacting an inner surface of the shell and opposite ends of the insert, and a nut configured to engage threads on an outer surface of the fitting body. When the nut is threaded onto the threads, the nut presses the shell and the insert into the tapered opening and presses the first pair of gaskets against the inner surface of the fitting body and the second pair of gaskets against the outer surface of the flexible pipe segment.