Fitting welding with unequal wall thickness ASME B31.3 2

[Vinzzzz]

Dear allI have a question regarding the welding of unequal wall thicknesses for butt welding fittings in accordance to the ASME B31.3.

As I have verified for pipes and fittings ASME B31.8 and B31.4 permitt the welding of unequal wall thicknesses only if the max walll thickness is not higher than 1 1/2 t min.

About B31.3 reference is made to ASME B16.25 but on this standard i don't have found anything that consider the welding of unequal thicknesses.Could someone help me to understand if for ASME B 31.3 unequal wall thicknesses could be welded without restrictions on maximum wall thicknesses?

regards Vincenzo

 

[metengr]

Please review ASME B16.25 Figure 1.

 

[Vinzzzz]

Metengr

thanks a lot i don't have seen in figure 1, note 2.

Now all isclear.
Regards Vincenzo

 

[XL83NL]

Maybe also para 328.4.3 and fig 328.4.3 of the 2010 edt of B31.3 may help you.