API 650 5-4b Help!

[JAG11512]

I'm having difficulty trying to figure out the thickness of a shell manway. Should I use table 5-4b or always refer to footnote b?

Any help would be appreciated.

 

[IFRs]

You have to always use both.

 

[JAG11512]

IFRs,

If I have a shell that is 5/16" thk. and the repad is 5/16" thick will the neck of the manway be 1/4" thk according to the table or is it supposed to be 5/16"thk according to footnote b?

 

[IFRs]

The footnote rules in this case, use a 5/16" thick neck assuming the flange is thicker.

 

[JAG11512]

Yes the flange is thicker (1/2"). If the shell was thicker than the flange is that when i would refer to the table 5-4b?

 

[IFRs]

Each time, you choose the thinner of the flange and shell (footnote) and then verify that you are not thinner than the minimum (table).

 

[JAG11512]

Thanks for your help on this. This cleared up alot of questions myself and others. I was always thinking the code was contradicting itself because of that table and footnote.