B31.3 only has one equation to compute the Sustained Code stress. Pipeline codes have several equations, and for dynamics you would want to combine like terms for the dynamic codes stress (longitudinal with longitudinal, hoop with hoop and so on). As I said above, CAESAR II isn't tracking which of these values is the static codes stress. The program has to be modified to do this. I suggest you make this request via the new Aha! portal.