Evaluating the old Piping system

Guys,

Any body could tell me how to change the configuration of the CAESAR II version 5.1 if I evaluating the old piping the system which is based on ASME B31.3 -1998.

I found out there is cases that my piping system is fail when using CAESAR II 4.5, however, it turn out pass when using caesar 5.0.

Different versions of C2 are based on the code in force at that time... codes change and so does C2

The codes are for new work only although a ballot (passed) I believe will allow B31.3 to be used for retrofit work.

Dont forget ASME FFS-1