Chemical pipelines
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Chemical pipelines come in large outer diameters and small outer diameters. For a pipe with an nominal diameter of DN40, the seamless steel pipe has an outer diameter of 48, while the elbows or tees connected to it have an outer diameter of 45. . Can they be welded together in this case?
It is not allowed to construct according to the diagram. Just fix it however you like; no one will care, that’s fine.
Sure, but it’s best if the differences between the two walls are equal; otherwise, there might be issues with the X-ray images after welding
It can be welded, but it looks ugly and is prone to drawing negative comments. Be sure to sit in the seat properly so that everything is aligned neatly.
For the pipes used in our projects, the 40 model has a large outer diameter, while all the others have a small outer diameter, which creates quite a problem. . It’s easy to make mistakes when purchasing materials, especially items like tees and elbows. For example, in the case of an elbow with dimensions DN100*40, DN100 represents the outer diameter, while DN40 represents the larger outer diameter. . Can manufacturers also produce this?
Such problems do occur in engineering practice, and the reasons are mainly as follows: 1. Technicians provide simple descriptions; we usually add a note in parentheses after the DN value to indicate the outer diameter. 2. Lack of professional knowledge among procurement staff. 3. Junctions between different construction units working on the same project. We handle this by welding directly when the quantity is small and the medium poses little risk, such as water or air; if the medium is hazardous, we use double-sided welded joints for transition. If the quantity is large, we have no choice but to purchase new components
Where they were welded together, lumps formed
If it can be welded together, there will still be a gap; with strict flaw detection, it’s likely to not pass.
Generally, pipe fittings remain of the same type: A-series stays A-series, and B-series stays B-series. If the order does not specify a change from A-series to B-series, such a change is rarely seen; if it does occur, it indicates that the manufacturer’s technical knowledge is insufficient.
This definitely won’t work; the two series have different standards