Dear Durga,

In my opinion, you are correct, also DAVE has mentioned in the same way. L6 (OPE) is not considering.

The confusing word for us in Code is about operating stress range, instead of that either to use as "Expansion Stress Range".

So, if use APPENDIX-P, do not club up with 1(a) & 1(b) with P1(a) & P1(b).

I do not have experience for the cold lines like negative temp.what APPENDIX-P is taking on that cases. Anyway for Hot temperature it is correct.

Add if any other ur thoughts.

Regards
SMD