Gas leakage is a hidden danger that cannot be ignored in nitrogen generator operation. Small leaks will cause reduced gas output, increased energy consumption, and unstable pressure, while large-scale leaks will lead to equipment shutdown and even safety accidents. Nitrogen is a colorless and odorless inert gas, making manual visual inspection difficult, so professional leak detection methods are required to find hidden leakage points. A complete set of leak detection processes can help users quickly locate faults, repair leaks in time, and ensure safe and efficient operation of the equipment.

First, conduct preliminary visual and auditory inspection for obvious leakage faults. Before formal leak detection, shut down the generator and fill the equipment and pipeline with nitrogen to the rated working pressure, then keep the equipment in static pressure holding state for 15–20 minutes. Observe the pressure gauge data closely: if the pressure drops significantly in a short time without gas usage, it confirms the existence of leakage. Visually check all connecting parts, including pipeline joints, valve ports, filter interfaces, and storage tank welds, for air bubbles, rust marks, and air leakage traces. Listen carefully to the equipment operation; subtle hissing sounds at static pressure state are typical signs of small leaks, which are mostly concentrated at loose joints and aging sealing rings.

Use professional foam detection method for accurate leak location, which is the most cost-effective and widely applicable method for household and small industrial generators. Prepare a neutral soapy water solution with moderate concentration, and evenly apply the solution to all pipeline joints, valves, welds, and sealing parts that are prone to leakage. Keep the equipment in static pressure state and observe the coated parts carefully. Continuous bubble generation indicates an accurate leakage point. Mark all detected leakage points with a marker, and classify them into minor faults such as loose joints and major faults such as pipeline cracks and weld gaps. This method is safe, simple, and free of equipment damage, suitable for daily regular leak detection.

For high-precision leak detection requirements, adopt professional leak detector equipment. Industrial users can use a portable nitrogen leak detector to scan the entire equipment and pipeline system. The high-sensitivity sensor can accurately capture tiny gas leakage that cannot be detected by the foam method, with detection accuracy reaching 0.01 MPa micro-leakage. Focus on detecting vulnerable parts including aging sealing gaskets, frequently switched valve cores, bent pipeline sections, and long-term used welds. After completing the full-system leak detection, sort out all leakage points and carry out classified repair: tighten loose threaded joints, replace aging and deformed sealing rings and gaskets, repair cracked pipelines and defective welds, and replace severely damaged parts directly.

Establish a regular leak detection mechanism to prevent recurring leakage problems. Conduct a full-system leak detection every month for daily use equipment, and conduct a comprehensive inspection before long-term equipment storage and after seasonal replacement. After each maintenance and pipeline disassembly, secondary leak detection must be carried out to ensure no hidden leakage dangers. Standard leak detection and timely repair can effectively reduce equipment energy consumption, maintain stable nitrogen pressure and purity, and eliminate potential safety hazards caused by gas leakage.