Hi Popy

They are all taken from the original paper by Leonard Zick, and modified slightly for each code. ASME Section VIII, Division 1 does not have the procedure for saddles in the body of the code. We formerly used the procedure from the Dennis Moss book: 'Pressure Vessel Design Manual'. However, in the 2007 version of ASME Section VIII, Division 2, a procedure was included for saddle analysis (again based on the Leonard Zick paper). We adopted this procedure also for ASME Section VIII, Division 1 as we felt that it was more logical to do so.

PD 5500 and EN 13445 have prescribed procedures to performing the saddle analysis.