The pipe wall thickness is different from the flange wall thickness
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The pipe wall thickness designed by the design institute is 11.91 mm, while the thickness of the accompanying flanges is 15.88 mm. How could this happen? And how can welding be carried out under such conditions?
Should it be butt-welded with a neck? Ask the design institute to verify what the minimum design wall thickness should be If the pipe calculations are correct, the flange wall thickness has been chosen to be too large
As for the flanges that are to be used, it is those who place the orders that need to provide the data from the design institute before making the purchase. The wall thickness should be selected based on the pressure
It might be that the flange is too thick; if the pipe thickness is appropriate, simply thin out the flange
Welding is fine; if radiographic inspection is required for the flange weld, it’s possible to obtain defective test results. The thicker parts can be polished a bit.
The thick flange neck can be beveled to provide a transition