Selection of welding joint coefficient
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A vertical pressure vessel with a diameter of 1600 and a height of 5000, equipped with a jacket; what is the inspection grade for the part covered by the jacket?
Inspect the inner jacket first, then weld the outer jacket
First, conduct a 100% RT inspection on the inner cylinder covering section and ensure it passes Inspection II before welding the jacket.
I have never worked on such jacketed vessels, but generally, the portion of a pressure vessel’s weld that is covered is 10% of RT
The jacket shall cover 100% of RT, and must be constructed as a Class I vessel. Additionally, the medium in which it is contained during testing is also taken into consideration.
The covered area must be defect-free, as it is difficult to repair; to fully ensure quality, 100% flaw detection is necessary before welding the jacket to confirm there are no issues.