Dear Shahid
Your query is not clear to us. however, pl. note following.
1.ASME SEC VIII Div-1 has given exception of reinforcement for Nozzle finished opening less than 2 inch for shell Thk great then 10 mm & 3 inch for shell THK less than 10 mm. However, in ASME SEC VIII Div-2 has not any exception, every opening to be calculated for adequacy of reinforcement.
2. ASME SEC VIII Div-1 has given reinforcement calculation based on the Area replacement method. However, ASME SEC VIII Div-2 has given Reinforcement Calculation based of pressure compensation method.
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Thanking you & with regards
Vishal Tailor