[Discussion Thread 32] Pressure tests on vacuum tower vessels are conducted using internal pressure, and the test pressure can be increased under certain conditions.
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This post was last edited by kareale88 on 2019-4-4 09:35: bg4.png【Discussion Thread 32】Vacuum tower vessels are subjected to pressure tests using internal pressure; under certain conditions, the test pressure can be increased. Vacuum tower vessels are subjected to pressure tests using internal pressure, and the test pressure can be increased under certain conditions. （）A、Correct ； B. Incorrect ； Personally, I think it is correct: the necessary condition is that the circumferential stress of the cylinder at the pressure used for the pressure test must be ≤ (0.8 or 0.9 times) the yield strength (or 0.2% offset yield strength) of the tower shell material at the test temperature, multiplied by the welding joint factor.
The standard specifies the minimum value for the test pressure; as long as the calculations are satisfactory, the test pressure can be increased.
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Increasing the test pressure is not limited to vacuum vessels; internal-pressure vessels can also have their test pressure increased. The standards specify minimum values; if a higher pressure than those specified is used for the pressure resistance test, it is necessary to first verify the stress levels of all stressed components under the test conditions.
Yes, the intended purpose of this question is: one is to demonstrate the pressure resistance test using internal pressure in a vacuum tower-type container, and the other is to address 4.5.1.7 c)