The sealless pump is used when there is a need to contain toxic, dangerous and/or valuable fluids. Application may be dictated by space, noise, environment, or safety regulations. This section outlines components of sealless centrifugal type pumps.
The driven shaft is completely contained in a pressurized vessel containing the pumped fluid. The pressurized vessel or primary containment device (chamber) is sealed by static seals such as gaskets or O-rings.
The power required by the driven shaft is transmitted through a containment barrier. Methods include (1) the "canned motor pump" with a liner (can) placed between an induction motor's armature and stator; (2) the "magnetic drive pump" with a shell(s) located between an outer rotating element with permanent magnet(s) and a mating inner ring which follows the driving magnets. The inner rotor may have permanent magnets or it may be an induction device.
Canned motor pump (CMP)
Close coupled end suction
In this group, the impeller(s) is mounted on the end of the shaft which is overhung from its motor bearing supports.
The impeller is mounted directly on the rotor assembly making one rotating assembly. The bearings are supported by housings at each end of the rotor assembly. The motor components are protected from the process liquid by non-magnetic liners (shells).
During operation, the motor section and bearings are cooled and lubricated by the process liquid by internal circulation, external circulation or by separate liquid flush.
Separated pump and motor
This group has single or multistage overhung impellers; however, the pump and motor are separated by a thermal barrier, usually an air space. The impeller is mounted on the rotor assembly which is supported by bearings at each end. The rotor assembly contains an auxiliary impeller which circulates the process liquid in the motor section through a heat exchanger for control of the fluid temperature.
The driven shaft is completely contained in a pressurized vessel containing the pumped fluid. The pressurized vessel or primary containment device (chamber) is sealed by static seals such as gaskets or O-rings.
The power required by the driven shaft is transmitted through a containment barrier. Methods include (1) the "canned motor pump" with a liner (can) placed between an induction motor's armature and stator; (2) the "magnetic drive pump" with a shell(s) located between an outer rotating element with permanent magnet(s) and a mating inner ring which follows the driving magnets. The inner rotor may have permanent magnets or it may be an induction device.
Canned motor pump (CMP)
Close coupled end suction
In this group, the impeller(s) is mounted on the end of the shaft which is overhung from its motor bearing supports.
The impeller is mounted directly on the rotor assembly making one rotating assembly. The bearings are supported by housings at each end of the rotor assembly. The motor components are protected from the process liquid by non-magnetic liners (shells).
During operation, the motor section and bearings are cooled and lubricated by the process liquid by internal circulation, external circulation or by separate liquid flush.
Separated pump and motor
This group has single or multistage overhung impellers; however, the pump and motor are separated by a thermal barrier, usually an air space. The impeller is mounted on the rotor assembly which is supported by bearings at each end. The rotor assembly contains an auxiliary impeller which circulates the process liquid in the motor section through a heat exchanger for control of the fluid temperature.
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Diesel Generators Inverters & Biomass
Tel: +27 13 752 7822
Cell: +27 82 814 4207
Cell: +27 82 553 8550
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Tel: +27 13 752 7822
Cell: +27 82 814 4207
Cell: +27 82 553 8550
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Commercial &
Industrial Pumps
Tel: +27 13 752 7822
Cell: +27 82 748 3858
Cell: +27 82 747 6172
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Industrial Pumps
Tel: +27 13 752 7822
Cell: +27 82 748 3858
Cell: +27 82 747 6172
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Continue ...
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Close coupled in-line
In this group, the pump and motor are mounted vertically. A single stage overhung impeller is used in conjunction with a casing with in-line flange connections. Motor and bearings are cooled and lubricated by the process liquid.
Vertical submerged canned motor pump
This group of pumps is of the single stage overhung impeller design that is suspended from a coverplate. The complete pump and motor is immersed in the process fluid. This method of installation provides sealless pump application inside a sealed vessel.
Magnetic drive pump (MDP)
Separately coupled
This group of pumps is end suction, single stage or multistage, overhung impeller design. The impeller is mounted on a rotor assembly which contains the inner magnet ring of a magnetic drive. The process fluid is retained by a containment shell which separates the inner magnet ring and the outer magnet ring.
The outer magnet ring is mounted on the shaft of a frame which is coupled to a motor or power device. All of the above is mounted on a common baseplate.
Close coupled
This group of pumps is of the same construction, except the outer magnet ring is mounted directly on the driver shaft.
Vertical submerged
In this group of pumps, the impeller is mounted on the end of a shaft which is overhung from its drive bearing supports. The drive section utilizes permanent magnets or an eddy current drive system to transmit power to the pump. This type of sealless pump uses a standard motor to drive the outer magnet ring, which in turn drives an inner magnet ring. A containment shell that contains the process fluid separates the magnet components.
The containment shell in the drive permits sealless pumping from a sealed vessel using a submergible pump.
In this group, the pump and motor are mounted vertically. A single stage overhung impeller is used in conjunction with a casing with in-line flange connections. Motor and bearings are cooled and lubricated by the process liquid.
Vertical submerged canned motor pump
This group of pumps is of the single stage overhung impeller design that is suspended from a coverplate. The complete pump and motor is immersed in the process fluid. This method of installation provides sealless pump application inside a sealed vessel.
Magnetic drive pump (MDP)
Separately coupled
This group of pumps is end suction, single stage or multistage, overhung impeller design. The impeller is mounted on a rotor assembly which contains the inner magnet ring of a magnetic drive. The process fluid is retained by a containment shell which separates the inner magnet ring and the outer magnet ring.
The outer magnet ring is mounted on the shaft of a frame which is coupled to a motor or power device. All of the above is mounted on a common baseplate.
Close coupled
This group of pumps is of the same construction, except the outer magnet ring is mounted directly on the driver shaft.
Vertical submerged
In this group of pumps, the impeller is mounted on the end of a shaft which is overhung from its drive bearing supports. The drive section utilizes permanent magnets or an eddy current drive system to transmit power to the pump. This type of sealless pump uses a standard motor to drive the outer magnet ring, which in turn drives an inner magnet ring. A containment shell that contains the process fluid separates the magnet components.
The containment shell in the drive permits sealless pumping from a sealed vessel using a submergible pump.
SK Series Liquid Ring Vacuum Pumps
AS Series
WQ Series
QJ Series Borehole Pumps
Sealless Centrifugal Pumps
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