Is it feasible to use DN20 pipes in place of DN15 socket-welded pipe couplings?
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During the construction of the project, DN15 stainless steel heat tracing pipes were encountered. Welding these pipes together posed a risk of poor weld quality, while using double-socket pipe clamps (which would require a large number of them) was costly. It was proposed to use a section of DN20 stainless steel pipe with a length roughly equivalent to that of the double-socket pipe clamps, in order to replace them. Both the DN20 and DN15 pipes have a wall thickness of 2.9 mm. Compared to the socket-welded pipe clamps used for DN15 pipes, these alternatives have a slightly thinner wall thickness. I wonder if anyone has used this approach before; I would appreciate everyone’s opinions on whether such a substitution is feasible and whether it violates any regulations.
Changing the full penetration joint to a fillet weld increases the probability of leakage; it shouldn’t be done.
All work must be carried out in accordance with the requirements of the construction drawings; one cannot assume anything otherwise. Worried about this and that, things like costs and such. Whatever is requested should be completed as per that request. If any changes are required, the design institute must issue a document detailing the engineering changes. There are also relevant regulations regarding welding quality requirements; if there is a concern that the welding quality might be problematic, an inspection can be carried out, and there are various methods for this purpose. For reference.
Pipe clamps and pipes are not the same thing
Strictly speaking, it’s not possible; first, the pipe socket is a forged part, and second, its thickness is greater than that of the pipe fitting.
Of course not! Complete nonsense! It’s better to just weld it directly.