Canned Motor Pumps for the Conveying of Liquefied Gases — Alternative for High Pressure

Related Vendors

Lutz Pumpen GmbH

EDL Anlagenbau Gesellschaft mbH

ProMinent GmbH

HERMETIC-Pumpen GmbH

Functioning Principle

Canned motor pumps are distinguished by an integral, compact aggregate. The motor and hydraulic section is one unit, where the rotor and impeller are arranged on a communal shaft. The rotor is guided by two identical medium-lubricated radial bearings. The stator of the drive motor is segregated from the rotor compartment by a thin can. The rotor compartment forms a communal compartment with the casing part of the pump, which must be filled with the transport medium prior to the start up or commissioning. The heat loss of the motor is dissipated by a partial flow between the rotor and stator.

As the entire motor heat loss is transferred to the transport fluid, specific measures must be employed to ensure that the fluid does not vaporise inside the aggregate. Generally, the vaporisation of the transport fluid inside the pump is excluded if the local static pressure is even greater than the vapour pressure of the heated transport fluid at this point.

At the same time, this partial flow lubricates the two hydrodynamic slide bearings in the rotor compartment. Along with the can as a hermetically sealed component, the motor casing presents a second safety shell. This distinguishes the canned motor pump together with the short and compact design as well as the extremely low level of noise in comparison with conventional centrifugal pumps and magnetic drive pumps.

In case of doubt, canned motor pumps are therefore always the better and safer alternative for the conveying of liquefied gases. According to the task involved, single-stage or multistage canned motor pumps are employed.

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