So, you've got an air cooler condenser supplier and a boiler supplier responsible for the piping design of lines connecting to the steam turbine?
That is a very strange arrangement and I'd be dubious of the piping design, much less analysis capabilities, of either vendor.
If your role is to check analysis, that implies that the two vendors you speak of first need to complete some valid analysis and piping design work for you to review. Some body has to come up with a design to satisfy the NEMA requirements.
krish, at this point, about all I can offer are my sympathies.
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Edward L. Klein
Pipe Stress Engineer
All the world is a Spring