Glass Bulb TPRD Inspection via Piston Movement Testing
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Solution Overview
Problem
Thermally-activated pressure relief devices, such as those with glass bulb designs, often face issues with the loss of release piston movability due to corrosion or foreign material blockage, leading to potential failure without noticeable indication, and lack a method for inspection during their lifetime.
Innovation Solution
A pressure relief device with a reactive component that changes conformation in response to environmental thresholds, allowing a member to slide and fluidly couple with an outlet, and a method to test its functionality by moving a stop between positions to assess the member's movement, utilizing a eutectic material or frangible component that breaks at a threshold temperature or pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass bulb TPRD design is used, then pressure relief function is achieved, but release piston movability is lost due to corrosion and foreign material blockage
Solution Approach 1:
The patent extracts the reactive component (glass bulb) from the sealed chamber and positions it in a location accessible to the external environment. This allows the reactive component to be replaced independently without replacing the entire TPRD assembly, thereby maintaining pressure relief reliability while preventing piston movability loss through component replacement.
Solution Approach 2:
The TPRD is divided into separable components: the body, the reactive component, and the release mechanism. This segmentation allows the reactive component to be independently replaced when corroded or blocked, preserving the overall system reliability while maintaining ease of operation through modular maintenance.
2Reliability
If a glass bulb TPRD design is used, then pressure relief function is achieved, but there is no way to check or test the release piston during service life
Solution Approach 1:
The patent incorporates a visual indicator mechanism that changes color or position based on the release piston's status. This allows operators to easily detect whether the piston is functional or seized without disassembling the device, thereby maintaining reliability while significantly reducing the difficulty of detection and inspection.
Solution Approach 2:
The patent implements a feedback mechanism through visual indicators that provide real-time information about the release piston's operational status. This continuous feedback allows for ongoing monitoring of the pressure relief function's reliability without requiring complex testing procedures.
3Reliability
If the reactive component is sealed in a chamber, then protection is provided, but the member cannot slide freely when activated
Solution Approach 1:
The reactive component is extracted from the sealed chamber and positioned in an accessible location outside the sealed environment. This extraction maintains the integrity and protection of the sealed chamber while allowing the reactive component to respond freely to environmental conditions, thereby preserving both protection and activation speed.
Solution Approach 2:
The patent introduces a transfer mechanism that couples the reactive component to the release piston. This intermediary allows the reactive component to remain protected while still transmitting activation forces effectively to the release piston, maintaining both protection and sliding speed through the mediation of the coupling mechanism.
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
Enables reliable pressure relief and allows for the inspection of the device's operation, ensuring it remains functional and preventing potential failures by allowing for the testing of the member's movement and identifying any blockages or corrosion issues.
Implementation Method 1
The reactive component is sensitive to an environmental threshold that causes a conformation change in the reactive component thereby permitting the member to slide within the channel
Implementation Method 2
A frangible component comprising a fluid is disposed between an end of the member and a stop. The frangible component is sensitive to a threshold temperature that causes the frangible component to break
Implementation Method 3
utilizing a eutectic material or frangible component that breaks at a threshold temperature or pressure
Data Source
AI summary
A method and apparatus to periodically inspect and control piston movability are provided that can include using a contactless sensor system through a gas outlet port of a pressure relief device. By moving a stop, relative movement of the piston can be compared to the fixed body reflecting a movability or a blocking of the release piston. Inductive/magnetic or optical borescope sensors can detect piston movement through the gas outlet, for example. The activation function where the piston must move when activated can therefore be tested and maintained.