Thermoplastic Piping Leak Testing With Safe Low-Pressure Air
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Solution Overview
Problem
Leak testing of thermoplastic piping systems, particularly those with electrofusion joints, faces challenges with high-pressure gas methods that pose safety risks and difficulties in detecting leaks using low-pressure air due to pressure fluctuations and the risk of overpressure, as well as issues with liquid-based tests that render joints non-repairable.
Innovation Solution
A leak test system utilizing a pump assembly with a pressure sensor, controller, and solenoid valve to maintain a safe, prescribed pressure of up to 15 psig, combined with an ultrasonic leak detection device, allowing for safe low-pressure air testing and re-pressurization to compensate for pressure variations, and optionally operating as a vacuum pump to identify leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-pressure compressed gas is used for leak testing, then leak detection capability is improved, but safety risk increases due to potential rapid rupture and energy release
Solution Approach 1:
The patent changes the pressure parameter from high-pressure to low-pressure operation. The air pump is specifically designed to operate at low pressures that cannot exceed piping system design limitations, eliminating the safety hazard of rapid rupture while maintaining leak detection capability through continuous pressurization and monitoring
Solution Approach 2:
The patent replaces the traditional high-pressure mechanical compression system with a low-pressure air pump system controlled by electronic sensors and controllers. This substitution allows for precise pressure control and continuous monitoring, detecting leaks through pressure differential changes without the dangerous energy storage of high-pressure systems
2Object-affected harmful factors
If low-pressure air is used for leak testing, then safety risk is reduced, but leak detection capability deteriorates due to insufficient pressure differential
Solution Approach 1:
The patent implements continuous pressurization of the piping system using the air pump, eliminating pressure fluctuations that occur with intermittent pressurization. The controller continuously monitors pressure differential and keeps the pump running to maintain steady low pressure, allowing the ultrasonic analyzer to continuously detect leaks without the pressure drops that would mask leak signals
Solution Approach 2:
The patent employs feedback control through pressure sensors and controllers that continuously monitor the pressure differential across the piping system. When a leak is detected through ultrasonic analysis, the feedback system maintains the pressure differential by adjusting pump operation, ensuring continuous detectability of leaks even at low pressures
3Object-affected harmful factors
If pressure limiting devices are used to prevent overpressure, then safety is improved, but reliability deteriorates due to potential device failure causing catastrophic failure
Solution Approach 1:
The patent designs the air pump with inherent pressure limitations built into its mechanical design, creating a passive safety feature that cannot exceed piping system design limitations regardless of controller or sensor failure. This beforehand cushioning approach ensures that even if active pressure limiting devices fail, the system cannot reach catastrophic pressure levels
4Measurement precision
If liquid is used for leak testing, then leak detection is effective, but joint repairability deteriorates due to water exposure in electrofusion joints
Solution Approach 1:
The patent uses pneumatic (gas-based) leak testing with low-pressure air instead of hydraulic (liquid-based) testing. This allows effective leak detection through pressure differential monitoring and ultrasonic analysis while completely avoiding liquid contact with electrofusion joints, preserving their repairability since no water needs to be removed before re-fusing
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 safe and effective leak detection in thermoplastic piping systems without risking overpressure, allowing for precise location of leaks and minimizing the risk of water exposure, thus ensuring the integrity and repairability of electrofusion joints.
Implementation Method 1
an air pump configured to pressurize a piping system with air
Implementation Method 2
an ultrasonic leak detection device to locate potential leaks
Implementation Method 3
wherein an ultrasonic analyzer is used to detect for sounds made by air escaping through such openings
Data Source
AI summary
A system and method for leak testing a thermoplastic piping system is disclosed. The leak test system includes a pump assembly having an air pump configured to pressurize a piping system with air, wherein the air pump is configured by design not to output pressure exceeding the piping system design limitations. The pump assembly further includes a pressure sensor, pressure controller, pressure switch, and solenoid valve for maintaining the pressure within the piping system to a prescribed pressure. The leak test system can include tubing for connecting the pump assembly to the piping system, and further include an ultrasonic leak detection device to locate potential leaks identified on the piping system. As such, the leak test system can safely leak test a thermoplastic piping system, including brittle piping, with low pressure air, while being capable of re-pressurizing the system to compensate for pressure variations therein due to leaks and/or other external factors.