Dear sirs,

I want to run a WRC-107 calculation for support lugs without reinforcment plates on a vertical vessel (ASME VIII Div1).

So if I fill in 0 for thickness in the WRC-107 calculation parameters the analysis states:
Error/Warning Messages for WRC107 Analysis 1
ERROR - The pad thickness , 0. must be > 0.0 (Pad).

If 0.1 mm is used for the thickness a wrc-107 calculation is made without unacceptable stresses.

What should be done to calculate a wrc-107 for support lugs without reinforcement plates? And why does it not fail for extremely thin support plates?

Greets,
Joep