Rotating Machine Casing With Integrated Leak Detection Grooves
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Solution Overview
Problem
Existing solutions for sealing in rotating machine casings, such as turbomachines, lack effective means to detect and control gas leaks, leading to safety risks, increased maintenance costs, and complexity, especially when handling hazardous gases.
Innovation Solution
A casing design with split flanges featuring separation grooves and control grooves, along with fluid ducts for circulating inert gas, allows for efficient monitoring and control of leaks, isolating bolts from gas exposure and enabling proactive corrective actions without shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components or operations are added to detect and control gas leaks, then sealing performance and safety are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent embeds detection and control channels directly within the casing structure itself. The T-shaped groove system is integrated into the casing wall, with detection channels formed by the groove geometry and control channels created by connecting the groove to the internal volume. This nesting approach allows leak detection and control functionality to be incorporated without adding external components, thereby improving sealing performance while minimizing device complexity
Solution Approach 2:
The casing structure serves multiple functions simultaneously: it provides mechanical containment, creates sealing surfaces at split flanges, and incorporates leak detection and control capabilities through the integrated groove system. The T-shaped groove both defines the sealing geometry and creates the detection channel, while also serving as the control channel when connected to inert gas supply. This multi-functionality reduces the need for separate dedicated components for each function
2Reliability
If the machine is shut down for inspection and corrective actions in case of leak, then safety is ensured, but productivity is reduced
Solution Approach 1:
The patent enables preliminary detection of potential leaks through the detection channel system that monitors for process gas presence in the sealing area. By detecting leaks early through the T-shaped groove channels before they become critical, the system allows for planned maintenance scheduling rather than emergency shutdowns, thereby maintaining safety while preserving productivity
Solution Approach 2:
The detection channel system provides continuous feedback about the sealing integrity by monitoring for process gas in the groove area. This feedback mechanism enables real-time assessment of seal performance and triggers alerts for potential issues, allowing operators to take corrective actions at convenient times rather than requiring immediate shutdowns, thus maintaining both safety and productivity
3Device complexity
If bolts are exposed to process gas, then simpler sealing structure is achieved, but harmful factors increase due to gas corrosion and safety risks
Solution Approach 1:
The patent segments the sealing area from the bolt area using the T-shaped groove system. The groove creates a distinct detection channel that separates the process gas containment zone from the bolt exposure zone. This segmentation allows bolts to remain outside the process gas environment while maintaining sealing effectiveness, reducing corrosion risks and safety hazards without significantly complicating the sealing structure
Solution Approach 2:
The T-shaped groove system acts as an intermediary barrier between the process gas and the bolts. The groove channels detect and contain any process gas that might escape, preventing direct exposure of bolts to hazardous gases. This intermediary structure protects bolts from corrosion and safety risks while maintaining a relatively simple sealing configuration
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 effectively prevents gas leaks, allows for proactive control of sealing performance, reduces maintenance costs, and ensures safety by integrating leak detection and control within the existing machine architecture, compliant with API617 standards.
Implementation Method 1
a first duct in one of the first and second flange for circulating a fluid to and from the first grove; a second duct in one of the first and second flange for circulating a fluid to and from the second groove
Data Source
AI summary
A casing for a rotating machine includes an inner surface delimiting an inner volume for housing a rotor of the rotating machine; a first and a second shell that are joined together in a dividable manner, the first and second shell respectively comprising a first and a second split flange having a first and a second split surface contacting each other when the shells are joined together; a plurality of holes on the first and second split flange passing through the first and second split surface for housing a plurality of bolts; a first groove connecting the plurality of holes; a second groove between the first groove and the inner surface of the casing; a first duct and a second duct for circulating a fluid to and from the first and second grooves, respectively.