Compressor diffuser and shroud for a motor driven compressor

A method of installing a compressor diffuser and shroud in a motor driven compressor assembly comprising a first stage compressor and a second stage compressor, the method comprising:

• aligning the compressor diffuser and shroud with a bearing support plate of the motor driven compressor assembly using a cylindrical alignment tool;
• and
• coupling the compressor diffuser and shroud with the bearing support plate based on the aligning to seal a first stage compressor housing with respect to the compressor diffuser and shroud, the compressor diffuser and shroud comprising:
• a diffuser portion comprising a diffuser portion outer lip having a first sealing lip outer diameter to provide a first sealing interface to the first stage compressor housing;
• a compressor inlet portion comprising an inlet portion outer lip having a second sealing lip outer diameter to provide a second sealing interface to the first stage compressor housing;
• and
• a shroud portion comprising a curvature between the diffuser portion outer lip and the inlet portion outer lip to align with a first stage compressor rotor, wherein a ratio of the first sealing lip outer diameter to the second sealing lip outer diameter is between 1.622 and 1.628.