CANNED MOTOR PRINCIPLE

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A CANNED MOTOR PUMP IS COMPOSED OF: A TRADITIONAL CENTRIFUGAL HYDRAULIC & A SPECIAL SQUIRREL CAGE MOTOR CONNECTED IN A ONE PIECE ASSEMBLY.

schema canned motor pump - iso15783 api685
Canned motor pump schema

The Canned Motor Pump is composed of a traditional centrifugal hydraulic, connected to a special motor through a one piece assembly.
 The stator is canned in the air gap, confining the liquid in the rotor chamber. The pump liquid circulates through the rotor chamber, cooling the motor, and lubricating the slide bearings that support the rotor. The casing of the chamber forms a sealless enclosure that confines the liquid without any dynamic sealing.

 

Moreover, in case of stator liner rupture, the liquid remains confined in the motor’s shielded shell (able to resist to explosions), and thus cannot leak externally. It is what we call the double security or double confinement. This gives the sealless canned motor pumps a decisive advantage against the magnetic drive technology which, in case of air gap hood, presents an immediate external leak.

 

Finally, the mechanical simplicity of the one piece canned motor pump, gives it many important technical advantages: Mechanical balance, Space benefit, No alignment, Low maintenance requirements, Silent functionning, Operationnal in explosive areas, Easy & effective surveillance, Various possibilities of motor cooling systems …

ADVANTAGES OF THE SEALLESS CANNED MOTOR TECHNOLOGY:

  • A double seal barrier = 100% leak proof !
  • No mechanical seal = optimal MTBF.
  • Low maintenance costs, long running life.
  • No expensive and complex lubrication or cooling 
systems necessary.
  • “One-piece” design = gain of space.
  • Low sound level.
  • Easy to assemble and disassemble.
  • No clamping tie-rod (security in case of fire).
  • Interchangeability: a given motor can be adapted on any hydraulic.
  • Complete Flushing by the flushing hole, without disassembling the 
pump.
  • Hydraulic balancing of the axial thrusts.
  • Automatic degassing.
  • Stator liner not submitted to the traction efforts created by the 
pressure or by differential dilatations.
  • Intense circulation of the liquid in the motor, allowing an effective 
cooling.
  • Possibility to install on the pump a liquid presence and/or a 
temperature sensor.