All,

I'm now doing pipe stress analysis connected to 3 stages reciprocating compressors. What i'm doing for checking nozzle loading at Compressors is calculate 3 stages separatly in term of NEMA check as follows:

1. Nozzle inlet TO 1st stage and nozzle outlet FROM 1st stage (combine)
2. Nozzle inlet TO 2nd stage and nozzle outlet FROM 2nd stage (combine)
3. Nozzle inlet TO 3rd stage and nozzle outlet FROM 3rd stage (combine)

Should all 3 inlet nozzles and 3 outlet nozzle be checked together in 1 calculation in term of NEMA check and combine all of them together. So, I add 3 nozzles inlet and 3 nozzles outlet at NEMA CII software.