Tracer Leak Detection in Double Wall Containers
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Solution Overview
Problem
Current methods for detecting leaks in double wall containers are inadequate for small leaks (0.005 cc/sec) and are not scalable for larger containers due to limitations in tracer diffusion and distribution, making it difficult to quickly and reliably detect leaks in larger systems.
Innovation Solution
A method involving a filling and evacuation system that actively disperses a tracer throughout the interstitial space by repeated pressure changes, allowing for the detection of leaks as small as 10−7 cc/sec to 1 cc/sec by redirecting fluid from the interstitial space for sampling, which increases sensitivity and reduces detection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure or vacuum decay methods are used to test interstitial space integrity, then the testing process is simple, but leaks as small as 0.005 cc/sec cannot be detected
Solution Approach 1:
A tracer gas is introduced as an intermediary substance into the interstitial space. The tracer serves as a mediator between the leak source and the detection system, enabling sensitive detection of small leaks through measurement of tracer concentration changes rather than direct pressure measurement.
Solution Approach 2:
The patent replaces the mechanical pressure/vacuum decay measurement system with a chemical/tracer-based detection system. Instead of measuring pressure changes that are insensitive to small leaks, the system uses tracer gas concentration measurement to detect leaks, substituting a more sensitive detection mechanism.
2Speed
If tracer diffusion is used to transport tracer throughout interstitial space, then the method is simple, but the process is slow over significant distances
Solution Approach 1:
The system employs periodic flushing operations where interstitial space fluid is repeatedly evacuated and refilled. This periodic action accelerates tracer distribution by mechanically circulates the tracer throughout the space rather than relying solely on slow diffusion, significantly reducing the time required for tracer to reach detection points.
Solution Approach 2:
The patent uses pneumatic principles by employing pressure differentials created during flushing operations to drive fluid flow through the interstitial space. This mechanical fluid circulation system rapidly transports the tracer throughout the space, overcoming the limitations of passive diffusion over significant distances.
3Measurement precision
If tracer is added to primary containment and flushed through annular space, then the tracer can be detected, but the pressure differential causes fluid to flow from annulus to primary chamber
Solution Approach 1:
Instead of adding tracer to the primary containment and relying on it to leak through the barrier, the patent inverts the approach by adding tracer to the interstitial space (secondary containment side) and detecting it there. This reversal eliminates the problematic pressure differential-driven fluid flow from annulus to primary chamber while maintaining effective leak detection.
4Measurement precision
If the interstitial space is filled with liquid for monitoring, then liquid level can indicate leakage, but the containment must be filled before monitoring begins and fluid may be released before reaching the monitor
Solution Approach 1:
The patent replaces the liquid-filled containment monitoring system with a gas-phase tracer monitoring system. This substitution eliminates the requirement to fill the entire interstitial space with liquid before monitoring can begin, allowing immediate detection while reducing the time lag associated with fluid transport to the monitoring point.
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 method enables the rapid and reliable detection of small leaks in larger double wall containers by efficiently dispersing the tracer, reducing the time required for detection and improving the sensitivity of leak detection, thus reducing costs and preventing repeated failures in monitoring.
Implementation Method 1
At least the second chamber is then subjected to repeated pressure changes during filling and evacuation cycles via the filling and evacuation system, thus directing fluid flow from an interstitial space
Implementation Method 2
the tracer must diffuse, a relatively slow process over significant distances, or be transported by fluid flow or convection between any possible leak location and the sampling location
Implementation Method 3
the tracer must diffuse, a relatively slow process over significant distances, or be transported by fluid flow or convection between any possible leak location and the sampling location
Data Source
AI summary
Methods and apparatuses are disclosed for detecting small leaks in double wall containers using enhanced tracer dispersal and detection techniques. More specifically, economical, substantially closed leak detection apparatuses, methods and systems are disclosed that conserve interstitial fluid between container walls enhancing the duration and sensitivity of leak detection testing.