Nozzles of pressure vessels

[StuPeter]

Dear all!

I have a question regarding the Nozzle Neck minimum required thickness considering correct welding (welded joint) not internal pressure or opening reinforcement.
What is minimum thickness of the Nozzle Neck in relation to shell an pressure vessel or header thickness in case of SET-ON nozzle and SET-IN (Pass-through) nozzle?

My older mate claims that thickness of the Nozzle Neck should not be smaller than 40% wall thickness of the shell in case of SET-IN welded configuration and 60% in case of SET-ON welded configuration. Is this rule correct? What other rules applies in this case?

Thank you very much in advance.
Kind regards

 

[saplanti]

You should find the answer in the related code that you are supposed to comply.
Several codes have slightly different approaches to the issue. The best is for you to check within the code. Some even accept no reinforcement under certain nozzle size.