Rotating impeller throws sealant liquid (usually water) into a ring that compresses gas. Handles wet, dirty, condensable loads.
Typical range
1–500 HP, down to 30 mbar (single-stage)
Best for
Paper mills, chemical processing, condensers, anywhere the process gas is wet or carries slugs of liquid.
Components
- Impeller
- Cone or port plate
- Service liquid supply & separator
- Heat exchanger (closed-loop systems)
- Mechanical seal
Common issues
- Capacity drop → service liquid too warm (raises vapor pressure)
- Cavitation noise → operating too close to vapor pressure of seal liquid
- Seal leak → worn mechanical seal or shaft sleeve
Maintenance
- Maintain seal liquid temperature per OEM (usually <60°F / 15°C for water)
- Check seal liquid flow rate at every PM
- Inspect mechanical seal annually