Ten years after the development of the Multi-Stage Liquid Chlorine Pump, Lawrence began building Cryogenic Multi-Stage Pumps. These Cryogenic Pumps are used for handling liquids such as oxygen and nitrogen, at temperatures as low as -320°F. The top suction design of our pump has become a standard in the industry for handling fluids which are near or at boiling point.

Since most cryogenic pumps operate close to the boiling point of liquid, the best design solution is to use a vertical, top suction unit to prevent vapor binding.

Design Features

All designs and configurations position the inlet side of the pump above the discharge.  This top suction design prevents vapor binding while providing rapid venting and continuous priming.

All impellers, whether single stage or multi-stage designs, are supported by precision sleeve bearings which are positioned above and below every impeller stage.  This bearing configuration maintains the close tolerances required for efficient pumping of cryogenic liquids.

Both single and multi-stage cryogenic pumps can be designed to incorporate an inducer for low NPSH applications.  Inducers are engineered to provide optimum performance at the pump's operating speed.
 

Sensitive thermocouples are used to detect and monitor the liquid level in the pump column.  This safety feature ensures that the labyrinth seals operate in vapor phase.  Icing at the support plate is eliminated.

Easily replaceable cartridge assemblies are mounted in the bearing frame above the top mounting plate.  This configuration provides greater support for the pump shaft and eliminates the reliance of the drive motor's bearings.

Shaft sealing is provided by a precision labyrinth seal which operates at the suction pressure of the pump.  This labyrinth seal eliminates the requriement for costly and failure-prone high pressure gas seals.