Rupture Disk with Dual Scores for Hydrogen Embrittlement
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Solution Overview
Problem
Current devices protecting apparatuses under pressure do not automatically adjust their rupture pressure based on the chemical nature of the gas inside, leading to potential premature failure due to hydrogen embrittlement, especially when transitioning from inert gases to hydrogen.
Innovation Solution
A rupture disk with distinct fracture initiation scores on both planar faces, where one face is in direct contact with the apparatus and the other is at atmospheric pressure, allowing for automatic adjustment of rupture pressure based on the gas type, using finite element computation to optimize geometrical parameters for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single rupture pressure is designed for the rupture disk, then the device is simple to manufacture and install, but it cannot automatically adjust to different gas types, leading to potential premature failure under hydrogen
Solution Approach 1:
The rupture disk incorporates two different scores (first score and second score) located at different positions on the disk, each designed to initiate rupture at different pressure levels. This local differentiation allows the disk to exhibit different rupture characteristics depending on which score initiates the rupture, enabling automatic adaptation to different gas types without requiring multiple separate devices or complex control systems.
Solution Approach 2:
The scores are pre-positioned and pre-configured on the rupture disk during manufacturing, with the first score positioned to initiate rupture at a lower pressure and the second score positioned to initiate rupture at a higher pressure. This preliminary arrangement ensures that when the apparatus transitions between different gas types (e.g., from inert gas to hydrogen), the appropriate score will automatically initiate rupture based on the gas type, eliminating the need for manual reconfiguration or complex sensing mechanisms.
2Reliability
If the rupture pressure is kept high for inert gases, then the protection device is effective for inert gas operations, but it may cause premature rupture when hydrogen is introduced due to hydrogen embrittlement
Solution Approach 1:
The invention changes the rupture pressure parameter automatically based on the gas type present in the apparatus. By having two scores at different positions, the system can exhibit different rupture pressure values: a lower rupture pressure when hydrogen is present (initiating at the first score) and a higher rupture pressure when inert gas is present (initiating at the second score). This parameter change prevents premature failure under hydrogen while maintaining effective protection during inert gas operations.
Solution Approach 2:
The invention converts the harmful effect of hydrogen embrittlement into a beneficial automatic detection and response mechanism. The presence of hydrogen, which would normally cause premature failure, actually triggers the lower-pressure rupture path through the first score, allowing the system to safely vent before catastrophic failure occurs. The harmful chemical interaction between hydrogen and steel is thus transformed into a useful signal that activates the appropriate protection mode.
3Adaptability or versatility
If manual adjustment of rupture pressure is implemented for different gases, then the rupture pressure can be optimized for each gas type, but the device requires complex control systems and manual intervention
Solution Approach 1:
The rupture disk is designed to automatically detect and respond to different gas types through its dual-score configuration, without requiring external sensors, control systems, or manual intervention. The system serves itself by allowing the gas type to directly influence which score initiates rupture based on the chemical interactions (such as hydrogen embrittlement affecting the first score), thereby achieving adaptability through passive, automatic mechanisms rather than active control.
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 and automatic adjustment of rupture pressure according to the gas type, ensuring consistent performance and preventing premature failure by differentiating fracture initiation based on gas type, with rupture pressures under hydrogen being systematically lower than under inert gases.
Implementation Method 1
devices actuated by differential pressure between the interior and the exterior of the apparatus that they protect and are designed to operate by rupture
Implementation Method 2
The interaction consists of the adsorption of hydrogen at the surface of the steel and possibly the diffusion of the hydrogen in the volume thereof
Implementation Method 3
the adsorption of hydrogen at the surface of the steel and possibly the diffusion of the hydrogen in the volume thereof
Data Source
AI summary
A rupture disc for a device for protecting against overpressures inside an apparatus, the disc is made of a generally circular part including two planar surfaces substantially parallel to one another, and two notches each located along a circumference, the circumferences of the two notches being different from one another, the notch located on the larger circumference being made on one of the planar surfaces, referred to as lower surface, while the notch located on the smaller circumference is made on the other one of the planar surfaces, referred to as upper surface.