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The airtightness test of the compensator allows for the verification of the tightness and sealing quality of the welds as well as all detachable connection points, ensuring that the product remains leak-free under operating conditions. In engineering, not all products require a leak test. According to the regulations, a gas-tightness test is conducted only when the working medium is flammable, explosive, or classified as having a moderate or higher level of hazard, when operating under vacuum conditions with a vacuum degree greater than 0.085 Mpa, or when there are special requirements regarding leaks. The airtightness test should be conducted after the pressure resistance test is passed; if the pressure resistance test is an air pressure test, then an airtightness test is not required. The test pressure for airtightness is generally set at 1 times the design pressure. Before the airtightness test, both ends of the compensator should be fixed to prevent movement at its ends during the test. During the test, the pressure should be increased gradually until it reaches the specified value. After pressure testing, maintain the pressure for 10 minutes; no leakage shall occur. The temperature of the test medium should be no lower than 5°C. During the airtightness test, the following methods can be used to check for leaks. ①Apply a foaming agent (such as soapy water at a weight ratio of 10%) to joints such as welds and flanges for inspection. If there is a leak, bubbling will occur at that location. ②Submersion inspection. For compensators of small size, they are usually submerged in a tank for inspection, and the presence or absence of bubbles escaping is used to determine whether they are airtight. ③1% ammonia is added to the test gas medium, and test strips 20 mm wider than the welds are attached to areas such as the outer wall welds; any color change is observed to determine whether there is leakage. For example, a test strip soaked in phenolphthalein reagent turns red when exposed to ammonia gas. Appropriate safety measures must also be in place when conducting a gas-tightness test. I hope this brief introduction will bring significant benefits to everyone. We welcome everyone to visit our company when you have time to personally check the product quality. We look forward to your arrival with great enthusiasm!