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NEMA SM-23 criteria for external loads on Turbines/Compressors!

NEMA SM-23 criteria for external loads on Turbines/Compressors!

NEMA SM-23 criteria for external loads on Turbines/Compressors!

(OP)
I am calculating and checking the piping loads at nozzles of a 2 stage compressor which may also operate in parallel.  Compressor assembly drawing shows a Low pressure and High pressure side (each with an Inlet & an Outlet nozzle) on either side of the Motor.
When checking the combined resultant forces and moments (according to NEMA SM-23, sect. 8.4.6)of nozzles about "the resolution" point (largest nozzle), can I treat the 1st(LP side) & 2nd(HP side)stages as separate compressor casings? OR the load components of all 4 nozzles need to be summed about  "the resolution" point.  FYI, magnetic coupling has been used to connect LP & HP sides of the compressor to the Motor.  If couplings can be treated as a 'joint' in theory, then I would tend to treat each side of the compressor as a separate unit.
Am I totally off? can someone shed some light on this fuggy section of the NEMA code which is commonly applied to compressors as well.
thanks in advance,
drno

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