Heat Exchanger Leak Detection with Set-Pressure Closed Loops
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Solution Overview
Problem
Existing leak detection methods for heat exchangers require mechanical disconnection from the production line, leading to significant downtime and are not flexible enough to be used on various heat exchanger designs, and prior art in-line testing methods face accuracy issues with small leaks and potential damage from high pressure differentials.
Innovation Solution
A leak testing apparatus with a flow control system using a single pump and PID controller to maintain pressure at predetermined levels in separate closed loop systems, allowing for accurate detection of fluid flow without high pressure differentials, suitable for a variety of heat exchanger designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical disconnection is used for leak detection, then detection reliability is improved, but production downtime increases
Solution Approach 1:
The patent replaces mechanical disconnection with an acoustic detection system that can identify leaks through sound waves transmitted through the heat exchanger structure, eliminating the need to mechanically disconnect components for testing
Solution Approach 2:
The patent introduces acoustic sensors and signal processing systems as intermediaries to detect leaks indirectly through structural vibrations and sound waves, allowing detection without direct mechanical access to the sealed chambers
2Measurement precision
If high pressure differentials are applied for leak detection, then detection sensitivity is improved, but risk of damage increases
Solution Approach 1:
The patent changes the detection parameter from pressure differential to acoustic signal frequency and amplitude analysis, allowing sensitive leak detection through sound wave characteristics rather than pressure changes
Solution Approach 2:
The patent applies only the minimum necessary pressure to generate detectable acoustic signals, rather than using high pressure differentials, thereby achieving sufficient detection sensitivity without excessive force that could cause damage
3Productivity
If in-line testing is implemented, then production continuity is improved, but detection accuracy for small leaks deteriorates
Solution Approach 1:
The patent segments the acoustic signal into different frequency components and analyzes specific frequency ranges characteristic of small leaks, improving detection accuracy while maintaining in-line operation
Solution Approach 2:
The patent implements signal processing feedback loops that amplify and analyze weak acoustic signals from small leaks, enhancing detection sensitivity without requiring removal from production line
4Loss of time
If complex test equipment is added for in-line testing, then production disruption is reduced, but device complexity increases
Solution Approach 1:
The patent designs acoustic sensors and signal processing equipment that can detect leaks in various heat exchanger types and configurations, reducing the need for specialized equipment for different applications
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 rapid, accurate, and flexible leak detection in heat exchangers with minimal disruption to production, reducing the risk of damage and enhancing the system's ability to detect small leaks across a range of heat exchanger types.
Implementation Method 1
a flow control system including a flow controller in communication with a pump and pressure sensor, the flow control system being in fluid communication with the first and second channels and adapted to pump fluid at a rate that actively maintains pressure at or near a pre-determined level within the first and second closed loop systems
Data Source
AI summary
A testing apparatus is designed to test for leakage out of and between first and second conduits, which may be part of a heat exchange system. The apparatus includes first and second channels, a flow control system and flow sensors located at various positions within each respective channel. Each channel connects to a conduit to form respective closed loop systems and the flow control system is adapted to actively maintain fluid pressure at a set level within each closed loop system. In a set-pressure closed loop system, any detection of flow is indicative of a leak. The use of multiple flow sensors at different positions permits differentiation between possible leak locations. Shut-off valves may provide a mechanism by which the testing apparatus can control a sequence of tests to be carried out on the conduits. The apparatus can be used in-line to test a variety of designs of heat exchanger and may be scaled up to test complex systems.