Ring main units, gas insulated switchgear and gas insulated cabinets rely on gases such as sulfur hexafluoride or nitrogen to maintain insulation performance. The sealing quality of the gas tank directly determines reliability over the equipment service life. Helium leak testing is one of the most reliable methods for detecting the leakage rate of sealed enclosures. Taizhou Yufeng Intelligent Equipment Co., Ltd. provides design and manufacturing of helium leak detection equipment for switchgear manufacturers.
Helium mass spectrometer leak detection principle
Helium leak detection uses the small molecular size and low background of helium gas. Helium is filled into the tested tank, and a helium mass spectrometer leak detector measures the helium concentration outside the tank to determine the leak location and rate. For batch production, whole-tank leak testing is common: the tank is placed in a vacuum chamber, helium is filled, and the helium concentration inside the vacuum chamber is measured to judge pass or fail quickly.
Leak test station and process
The leak test station is organized in the flow of tank cleaning, evacuation, helium filling, leak detection, helium recovery and removal and sorting. The tank is evacuated first to remove moisture and impurities, then helium is filled to the set pressure. The leak detector judges pass or fail automatically according to the set leakage rate standard. Qualified tanks recover helium and move to the next process. Non-conforming tanks are marked at the leak point and returned for rework. The whole flow is controlled by the PLC and test data is recorded automatically.
Leakage rate standard and judgment
The leakage rate standard is determined by the product sealing requirement and operating pressure. We set the judgment threshold of the leak detector according to the customer standard and support recipe management for different tank parameters. Leak test data is bound to the tank number to form a quality file for traceability and statistical analysis.
Equipment configuration and selection
Leak detection equipment is selected according to the tank size, weight and cycle, including the leak detector, vacuum pump set, helium filling system, helium recovery device and conveying mechanism. For factories with high output, a multi-station leak detection system can be used to improve efficiency. The helium recovery device recovers most of the helium to reduce operating cost.
Supporting services
We provide solution design, manufacturing, installation and commissioning, metrology calibration and personnel training for leak detection equipment. For customers with existing leak detection equipment, we also provide station renovation and efficiency improvement services.
For helium leak detection equipment for ring main unit and gas insulated switchgear tanks, contact Taizhou Yufeng Intelligent Equipment Co., Ltd.