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The airtightness test is primarily used to check whether there are any leaks at the various connection points of the container. Pressure vessels with a medium toxicity level that is extremely hazardous or highly hazardous, or those for which even trace leaks are not permitted by design, must undergo a leak-tightness test. Pressure vessels shall undergo a gas-tightness test in accordance with the following requirements: (1) The gas-tightness test shall be carried out after the hydraulic test is successful. For pressure vessels whose design requirements call for a pressure test, the airtightness test can be carried out simultaneously with the pressure test, and the test pressure shall be the same as that of the pressure test. (2) For pressure vessels made of carbon steel and low-alloy steel, the temperature of the gas used for testing shall be not lower than 5°C; for pressure vessels made of other materials, it shall be as specified in the design drawings. (3) The gas used for the airtightness test should be dry, clean air, nitrogen, or other inert gases. (4) When conducting a airtightness test, all safety accessories must be installed. (5) During the test, the pressure should be increased gradually; once the specified test pressure is reached, it should be maintained for 10 minutes before being reduced to the design pressure. Soap water should be applied to all welds and connection points for inspection, and no leaks are considered acceptable. In the event of a leak, carry out hydraulic and airtightness tests again after repair. A gas-tightness test is different from a pressure test. Firstly, their purposes are different; a airtightness test is used to check the tightness of pressure vessels, while a pressure test is used to assess the pressure resistance of such vessels. Secondly, the test pressures are different: the airtightness test pressure is the design pressure of the container, while the pneumatic test pressure is 1.15 times the design pressure.