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
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
