Gas leak testing is the single most important quality gate on a gas stove assembly line — but not all leak test methods are equal. The two most common approaches, pressure decay and water immersion, differ sharply in accuracy, speed, and cost. Choosing the right one shapes your line's throughput and safety record. Here is a practical comparison.
Pressure decay testing pressurizes the sealed gas system, then measures how much pressure drops over a set time. A pressure drop beyond a threshold indicates a leak. This method is fast, dry, and easy to automate — ideal for high-throughput lines. It provides a quantitative pass/fail and is the standard in modern manufacturing. The trade-off is a higher equipment cost and the need for proper calibration.
Water immersion pressurizes the assembly and submerges it in a water tank; escaping gas forms visible bubbles that pinpoint the exact leak location. It is low-cost, simple to set up, and excellent for troubleshooting because it shows where the leak is. However, it is slower, manual, and leaves the assembly wet, so it fits lower-volume or diagnostic work better than a fast production line.
For steady production, pressure decay testing gives the speed and repeatability you need at the line's pace. Water immersion earns its place as a diagnostic and low-cost verification tool, especially during pilot runs and for locating leaks found by the primary tester. Many operations use pressure decay inline and keep a water tank for root-cause work.
The right method is the one that keeps up with your line's takt time without compromising safety. THREEMI advises CKD partners on gas leak test method selection, specifications, and sourcing — so your testing keeps pace with production and every stove leaves your line gas-tight.
THREEMI is the export brand of Shenzhen Sanmi Manufacturing Co., Ltd., a professional gas stove and kitchen appliance factory in Guangdong, China. With 400+ employees, a 20,000㎡ production facility, and an annual output of 3 million units, we serve wholesalers, distributors, brand owners, and e-commerce sellers in over 30 countries. Our factory is certified ISO9001, CCC, CE, UL, GS, ETL, NF, and SASO.
We supply complete gas stove CKD (Complete Knock Down) kits, plus assembly guidance, worker training support, and equipment purchasing advice — so you can build a reliable local manufacturing operation. Contact us to plan your CKD program.
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