API 617 Combined Nozzle Loadings

Hello Stressers!!

I have a multi stage centrifugal compressor (LP & HP).

LP Suction Nozzle Size: 42 in
LP Discharge Nozzle Size: 14 in

HP Suction Nozzle Size: 16 in
HP Discharge Nozzle Size: 10 in

How do we handle this case?

1) Separately (2 nozzles each)

LP resolution point is 42 in & HP resolution point is 16 in.

2) Combined (All four nozzles)

HP & LP resolution point is 42 in.

Warm Regards,

If it is a single barrel - option 2
If there are sepparate barrels - option 1

In any case asking the manufacturer is the best option

Thanks Danb.

Cheers!