Governing Thickness Preheat ASME B31.3 1

[Jeldon]

How do I know what the nominal thickness to be used for preheating of joints type branch connection. Type FIG. 328.5.4D - Sketches(1) (3) and (5).
Thanks to everyone.

 

[Camba]

Read Requirements in 330.1.1. "the thickness intended is that of the thicker component measured at the joint".
In sketches 3 & 5 you have to check three welds individually.

 

[Jeldon]

Dear Camba, thank you for the reply. Then the thickness is considered to be the largest in the joint. Hugs from Brazil