How to conduct a airtightness test on a negative pressure tower?
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Is it better to do it with positive pressure or negative pressure? If a leak test is conducted under negative pressure, does the reflux tank section need to be tested separately?
Just operate under positive pressure; there is no relevant standard support for operating under negative pressure.
That’s right; a positive pressure can be applied, typically up to 0.2 MPa, and negative pressure can also be used for pressure retention, with a drop of no more than 0.002 KPa per hour
It is best to ensure airtightness under positive pressure; so how can leaks be detected under negative pressure?
The method of using negative pressure to detect leaks involves sticking transparent tape to the flange; if there is a depression, it indicates a leak, but this approach is quite time-consuming
Is it 0.1 or 0.2 Mpa? I don’t have any experience in carrying out such operations, so I’m not sure
The method you mentioned might be easier to apply in cases where the leakage is obvious, but it’s impossible to detect minor leaks. It is recommended to use foaming agents such as laundry detergent under positive pressure to detect leaks, as even tiny bubbles can be detected.
It is carried out under positive pressure, mainly to test the density of the welds as well as the sealing quality of the sealing structures
2-3 kilograms of positive pressure; apply bubbles at the welds and flanges