errata: PCC is Post Construction Committee not Code.

Plant mechanical integrity managers are (should be) familiar with this. It is meant to be used in conjunction wth API 510, API 570 and NB-23.

ASME PCC-2 2008 Article 2.12 Fillet Welded Patches pg. 63. (I can't give you the pdf) The earlier 2006 edition does not have article 2.12.

Highlights of PCC-2 Repair of Pressure Euipment and Piping
http://www.ipeia.com/Misc_Docs/2009%20Reynolds.pdf

OP indicated "Erected at site". Didn't say new or old construction.

Repad. patch, scab have similar effects. They exist in the catalyst world or where there is slurry, coke fines, or decoking. Also where shutdown is highly avoided.

FEBend (Paulin Research Group) will give SIF's and flexibilities based upon actual geometry. Use a tiny attachment if only concerned about the pad effect. Review a model with and without torsion with various pad dimensions.