Referring to:
CSA Z662 - 15
Caesar Quick reference guide Code Stresses page 76

I have 2 questions:

1st
The equations on the quick reference guide matches my interpretation of the code. However the Caesar help on "All Cases corroded" directive indicating:

"If, however, you disable this option, the software will strictly follow the piping code recommendations. That is, depending on the active piping code, some load cases will consider corrosion and some will not."

When this directive is disabled, Caesar calculates the hoop and axial stresses based on the nominal wall thickness. This contradicts the Quick Reference equations and the code. If I understand correctly, Caesar does not follow the code if the directive is false. This means that results will not comply with the code on the less conservative side. In conclusion, "All Cases Corroded" directive SHALL be set to "True" to meet the code requirements.

2nd
CSA Z662 Para. 4.6.5 indicating the pipe Outer diameter is used to calculate the hoop stress. I checked Caesar results with hand calculations and found that Caesar uses the inner diameter instead. This produces a slightly lower hoop stress and does not comply with neither the code nor the Quick reference guide.

I hope some one can correct me or confirm my findings.

The CAESAR II Quick Reference Guide only shows the code stress not all the other flavors if stress (axial, bending, hoop, etc.). Think of these other stresses as "textbook" stresses - they do not necessarily follow those code rules.