Inner cylinder test of jacketed vessel
Thread Content
When the inner cylinder needs to undergo a gas-tightness test. Should the jacket be welded after the internal cylinder pressure test, or should it be welded after both the internal cylinder pressure test and the airtightness test are completed? Strictly speaking, should it be the latter?
It is the latter, because the welding jacket must be installed on the upper jacket after the inner cylinder has passed the tests. The pressure test must be carried out first/
It is necessary to wait until the jacket welding is completed and a pressure test has been carried out before proceeding
The 2nd floor does not match the 3rd floor. The 2nd floor means completing everything at the same time before welding the jacket. On the 3rd floor, the jacket is welded first, followed by sealing the inner cylinder. But can just performing pressure tests without conducting airtightness tests ensure that the welds surrounded by the jacket do not leak? My personal opinion is the same as the second floor’s.
I misunderstood my view on the second floor. The second floor only mentioned that a pressure test should be carried out first, avoiding the issue of a gas-tightness test.
Both the pressure test and the airtightness test should be conducted before jacket welding; otherwise, it will be impossible to verify the quality of the inner cylinder and its sealing requirements.
I also think that a hydrostatic test should be conducted after the inner cylinder is manufactured, followed by an airtightness test; only after both tests are successful should the outer cylinder be welded! !
When a gas-tightness test is required for the inner cylinder, it should be conducted before the jacket is welded. After the jacket is welded, the inner cylinder still needs to undergo a pressure test and a leak test
Reply to 4# Huoshaoyun: Is it true that the tubes are installed in the heat exchanger after the inner cylinder has undergone a hydrostatic test? Hehe
After the inner cylinder is manufactured, a hydrostatic test is conducted; once it passes, an airtightness test is carried out. After the airtightness test is successful, the jacket (outer cylinder) is welded, and after welding is complete, the inner cylinder is subjected to another hydrostatic test and an airtightness test. After passing the inspection, a pressure test is conducted on the jacket (outer tube).
It seems this question was asked appropriately. Personally, I think the jacket should be welded after both pressure testing and airtightness testing have been completed, but it is likely that most manufacturers weld the jacket only after performing the pressure test. Can anyone from a manufacturing company tell me how it’s actually done?