Should the airtightness test of pressure vessels take into account temperature coefficients?

This temperature correction factor isn’t very meaningful; strength has already been tested through pressure resistance tests, and the airtightness test is merely used to check the sealing quality.

Just multiply by a safety factor, I guess; I don’t know, I’m just guessing: lol

:Lol, don’t say such things – it can mislead people;P

The airtightness test is not a comprehensive strength test, and there is no need to consider stress differences due to temperature differences at all.

Why multiply by the temperature coefficient? What is the original poster’s main idea? The airtightness test is used to check for any leaks; the strength test has already been completed, and at this point the pressure used is the design pressure.

A gas-tightness test is used to check the overall sealing performance of a container, and no strength testing is required.

The 6th floor is correct; there is no need to use the temperature coefficient for the airtightness test (which should actually be the ratio of the allowable stress at normal temperature to that at the design temperature). The airtightness test must be carried out after the hydrostatic test is successful, in order to check the airtightness of each component against gases, as gases are more permeable than liquids.

Why is it said this way? I haven’t seen any specifications or standards that provide temperature corrections for airtightness tests. Could the original poster explain this?

From what I’ve seen, there is a term called temperature coefficient; however, neither the code for pressure vessels nor GB150 specifies any calculation factor related to temperature coefficients for airtightness. If design is carried out in accordance with those standards, such a factor is definitely not taken into account.

GB 150 and its Amendment 1, 10.9.6 Airtightness test: The vessel must pass a hydraulic test before it can undergo an airtightness test. The test pressure shall be in accordance with the provisions of 3.10. During the test, the pressure should be increased gradually; once the specified test pressure is reached, it should be maintained for a sufficient length of time to conduct leak checks on all welded joints and connections. Small containers can also be submerged in water for inspection. In the event of a leak, carry out hydraulic and airtightness tests again after repair. 3.10 Airtightness test: When an airtightness test is required, the test pressure, test medium, and inspection requirements shall be specified in the drawing. GB 150 does not specify exactly what the test pressure should be; it only states that this value should be indicated on the drawings. In my opinion, it is the design unit that determines this value, and generally, the design unit relies on the Pressure Vessel Code for such determinations. Article 101 of the Code: The airtightness test pressure for pressure vessels is the design pressure of the vessel. Conclusion: The pressure for the airtightness test is the design pressure; no temperature coefficient needs to be applied. This post was last edited by etsen on 2009-2-14 13:03]

The conclusions above apply to pressure vessel products, whereas the airtightness test during a comprehensive inspection is carried out in accordance with Article 25(12) of the \"Rules for Periodic Inspection of Pressure Vessels\": the test pressure for the airtightness test shall be equal to the highest operating pressure specified for this inspection. This post was last edited by etsen on 2009-2-14 13:09]

The test pressure for the airtightness test should be equal to the design pressure