Fuel Valve Leakage Detection via Pressure Rate Monitoring
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Solution Overview
Problem
Conventional leakage checks in fluid valves, particularly in power generation systems like gas turbines, are time-consuming and prone to false-positive results due to their reliance on pressure differences, which do not account for varying fuel operating conditions and leakage from multiple valves simultaneously.
Innovation Solution
A method and system for detecting leakage in fuel valves that involve monitoring pressure changes over short time spans and applying correction factors based on fuel properties, such as specific gravity and compressibility, to accurately assess leakage rates and distinguish between valve types, thereby reducing false positives and improving test efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure-based leakage checks are performed over extended time periods, then measurement precision may be improved, but productivity decreases and false-positive results increase
Solution Approach 1:
The patent changes the parameter of test duration from extended periods to short time spans, and introduces correction factors based on fuel properties (specific gravity, compressibility) to maintain measurement precision while reducing test time and eliminating false positives caused by multiple valve interactions
2Device complexity
If conventional pressure difference methods are used, then device complexity is minimized, but measurement precision deteriorates due to inability to account for multiple valve leakage and varying fuel conditions
Solution Approach 1:
The patent maintains simple device structure while improving measurement precision by changing the parameters used for assessment - introducing correction factors based on fuel properties (specific gravity, compressibility) and using rate of change of pressure measurements rather than simple pressure differences, enabling accurate leakage detection that accounts for multiple valve interactions and varying fuel conditions
3Reliability
If pressure monitoring is extended over long durations, then reliability of leakage detection may be improved, but loss of time increases and system productivity decreases
Solution Approach 1:
The patent achieves reliable leakage detection in short time spans by changing the measurement approach - using rate of change of pressure with respect to time and applying correction factors for fuel properties, which eliminates the need for extended monitoring while maintaining or improving detection reliability through more accurate physics-based assessment
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
This approach reduces the time required for leakage detection and enhances accuracy by accounting for fuel-specific properties and minimizing interference from other valves, leading to more reliable pre-startup assessments and preventing potential damage from excess leakage.
Implementation Method 1
monitoring pressure changes over short time spans... to accurately assess leakage rates
Data Source
Figure 1
AI summary
A method detection of leakage through at least one first valve (22) includes admitting an amount of fluid into a first control volume (28) in operable communication with the at least one first valve (22), thereby pressurizing the first control volume (28). The first control volume (28) is isolated and a rate of change of pressure in a second control volume (32) in operable communication with the at least one first valve (22) is measured. A system for detecting leakage across at least one first valve (22) includes a first control volume (28) receptive of an amount of fluid and a second control volume (32) in flow communication with the first control volume (28). At least one first valve (22) is located between the first control volume (28) and the second control volume (32), and a rate of change in pressure in the second control volume (32) indicates a rate of leakage through the at least one first valve (22).