As per Part 1 of PCC-2, Engineering judgments shall be consistent with good engineering practices and such judgments shall never be used to overrule mandatory requirements.

It is my understanding that under 212-3.2 Internal Pressure Loads, the standard makes a mandatory requirement by considering P=internal design pressure for cases where the resultant stress is membrane stress.

In addition, by 212-3, PCC-2 asks for an additional engineering analysis for cases where the component to be repaired is subject to bending, torsion, wind loads or to fatigue.