Topics Outline: • Meeting current rotordynamics stability standards • High flow coefficient/mach number impellers • Low flow coefficiens/high pressure impellers; Reynolds correction • Complicated high pressure gas properties. E.g., CO2, acid gas, H2S • Testing of the equipment • Modern manufacturing/forming methodologies • Simulation and dynamic process modeling • Handling of Chlorides in sour/acid gas applications, including piping; end-user strategies • Hermetically-sealed compression