Canned motor centrifugal chemical transfer pump

A canned motor centrifugal pump integrates a fully enclosed electric motor with a centrifugal pump in a single, seal-less unit designed for leak-free transfer of liquids. By enclosing the rotor and stator separated by a thin, non-magnetic corrosion-resistant sleeve and using liquid-immersed bearings, this design eliminates dynamic shaft seals and external leakage — making it especially suitable for handling hazardous, toxic, flammable, valuable or corrosive liquids.

Key features

• Seal-less, leak-free construction: no dynamic shaft seal eliminates external leakage and reduces environmental contamination and product loss.
• Motor cooled by pumped liquid: the motor is cooled by a portion of the conveyed liquid circulating through a narrow annular gap; provides compact design and low noise.
• Corrosion-resistant sleeve: non-magnetic, thin-walled sleeve separates stator and rotor for electrical isolation and media compatibility.
• Bearings immersed in fluid: front and rear bearings are lubricated and cooled by the pumped liquid for reliable operation when fluid is clean.
• Wide operating envelope: suitable for vacuum service and for high/low temperature, high pressure, and high melting point media when correctly specified.

Benefits for industrial users

• Improved safety and compliance: eliminates leak points for handling flammable, toxic or valuable fluids.
• Reduced maintenance: with correct selection and clean service conditions the pump requires minimal routine maintenance.
• Compact footprint and low noise: space-saving design and quiet operation help create a better working environment.

Typical applications

• Chemical transfer and dosing where leakage is unacceptable
• Hydrocarbon and solvent handling in controlled environments
• Vacuum systems and processes requiring tight containment
• Transfer of corrosive or high-value liquids in chemical, petrochemical and pharmaceutical plants

Selection and operational guidance

• Liquid cleanliness: because the annular gap and bearings rely on the pumped liquid for cooling and lubrication, the fluid must be free of solids, gels, precipitates or coking material. Do not use for slurry or heavily contaminated media unless a specifically designed model for slurries is selected.
• Cooling and circulation: many canned motor pumps include circulating cooling lines; verify whether external circulation or heat exchanger connections are required for your application.
• Freeze protection: when ambient or process temperatures risk freezing, provide anti-freeze jackets or accompanying piping to ensure reliable start-up.
• Valve sequence: follow correct valve operation procedures: when starting, open outlet valve then inlet valve as specified by the manufacturer; when stopping, close outlet valve first, then inlet valve after the pump has stopped.

Model note

• Model: HP100-400. Confirm detailed material options, hydraulic curve, allowable temperatures and pressures, and certification requirements with supplier before ordering to match your process conditions.