Canned Motor Centrifugal Pump

Pressure-Contained Design for Cryogenic and Hazardous Fluids

 

The canned motor centrifugal pump integrates the motor and pump within a sealed pressure vessel. The motor stator and rotor are housed in a closed cavity isolated from the pumped medium, with the pressure vessel providing the primary containment barrier. This design is well-suited for LNG, liquid nitrogen, liquid argon, ethylene, and LPG where high-pressure, leak-tight operation is required.

The motor and pump share a common shaft with no coupling, eliminating the alignment maintenance that couplings require. The entire rotating assembly is enclosed within the pressure vessel, with no exposed rotating parts. The motor windings are protected from the process fluid by the containment shell, while the pumped fluid may provide cooling to the motor section depending on the configuration. Wetted components are manufactured from stainless steel, copper alloys, or forged aluminum alloys validated for cryogenic service.

Flow rates range from 0.5 m³/h up to 2,500 m³/h, with heads up to 2,600 meters. The pressure vessel is designed to applicable pressure vessel codes and can be customized for different pressure ratings. The pump handles low-boiling-point, high-vapor-pressure liquids with minimal leakage risk.

Reliable Sealing and Containment

 

The static seal between the process fluid and the atmosphere is provided by the pressure vessel itself-a welded or bolted construction without dynamic seals. This eliminates the need for seal support systems, seal flush, and routine seal maintenance.

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Each pump undergoes 100% performance testing before shipment. The company can arrange third-party inspection and customer witness testing. Custom-engineered pumps have a lead time of approximately 32 weeks from technical approval to delivery. Installation guidance, commissioning support, and spare parts supply are available as specified in the contract.

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