Cable Termination Seal Retention Under Overpressure
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Solution Overview
Problem
Existing harsh environment cable terminations face issues with breakout boot seals being easily displaced due to internal overpressure, leading to potential leaks and failure, especially in applications where rough handling or pressure changes occur.
Innovation Solution
A field-installable, removable, and repairable cable termination with a unified component that integrates a flexible-walled fluid chamber enclosure and a positively retained breakout boot seal, featuring a pressure relief mechanism that vents excess material to the outside environment, preventing internal pressure from dislodging the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If elastomeric breakout boot seals are used to seal cable ends in fluid-filled terminations, then the seals can be easily installed in the field, but the seals are easily displaced from their sealing positions due to internal overpressure or rough handling
Solution Approach 1:
The breakout boot seal is segmented into multiple sections along its length, with each section capable of independent deformation. This segmentation allows the seal to conform to cable irregularities while maintaining sealing pressure, and the segments can deform independently to accommodate pressure changes without displacing the entire seal from its position.
Solution Approach 2:
The breakout boot seal is constructed from elastomeric material that forms a flexible shell structure. This flexibility allows the seal to adapt to cable shape variations and maintain contact pressure on the cable end, while the elastomeric properties enable it to withstand and respond to internal pressure changes without rigid displacement.
2Reliability
If fluid-filled terminations are used to protect conductor junctions from environmental fluid intrusion, then the protection against harsh environments is improved, but the complexity of the termination increases due to multiple components needed to prevent oil loss
Solution Approach 1:
The breakout boot seal and the flexible-walled fluid chamber enclosure are merged into a single integrated component. This unification eliminates the need for separate sealing elements and structural components, reducing the total number of parts while maintaining both the environmental protection function and the pressure containment function of the fluid-filled termination.
Solution Approach 2:
The integrated breakout boot seal enclosure serves multiple functions simultaneously: it seals the cable end to prevent fluid intrusion, contains the mobile substance within the chamber, provides structural support for the cable connection, and accommodates pressure changes through its flexible walls. This multi-functionality reduces the number of specialized components needed.
3Ease of manufacture
If traditional elastomeric breakout boot seals are used, then the installation can be performed in the field without specialized equipment, but the seals can be pushed off the cable end by overpressure within the cable
Solution Approach 1:
The elastomeric material of the breakout boot seal provides flexibility that allows it to be stretched over the cable end during field installation without requiring specialized tools. The same flexibility enables the seal to deform and accommodate pressure changes from within the cable, preventing the seal from being pushed off while maintaining its sealing position.
Solution Approach 2:
The breakout boot seal is designed with dynamic characteristics that allow it to respond to changing pressure conditions. The elastomeric structure can expand and contract, deform and recover, adapting to internal cable pressure variations throughout operation, thereby maintaining seal integrity under varying stress conditions without fixed rigid constraints.
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 ensures reliable sealing and prevents catastrophic failure by maintaining the boot seal's position even under internal overpressure, enhancing the reliability and ease of installation of fluid-filled cable terminations in harsh environments.
Implementation Method 1
Pressure compensating the terminations relieves much of the stress on the conductor junctions, and reduces the possibility of environmental fluid intruding into the termination
Implementation Method 2
a flexible-walled fluid chamber enclosure that allows the chamber to adjust for volume and pressure changes
Implementation Method 3
breakout boot seals are often used to seal the interfaces where individual conductors issue from the cable's end
Data Source
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AI summary
The cable termination may include a housing and a cable having at least one conductor disposed within the housing with an elastomeric body disposed in the housing and constrictively stretched over a portion of the cable. A retainer may be disposed around a portion of the cable for retaining the elastomeric body on the cable. The cable termination may also include an enclosure capable of changing volumetrically in response to fluctuating pressure disposed in the housing and around a portion of the cable.