The purpose for the bottoming clearance is to reduce the residual stress at the root of the weld

　　The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.

　　Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.

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