Sealless Canned Motor Pumps

SEALLESS CANNED MOTOR PUMPS

Sealless Canned Motor Pumps – We are Sealless Canned Motor Pumps manufacturer in Mumbai.

PRINCIPE OF CONSTRUCTION

Canned motor pumps are characterised by a compact, integrated unit without mechanical shaft seal and therefore are also called Sealless pumps. The motor and pump form a single unit with the rotor and impeller mounted on a common shaft with no coupling joints in between. The rotor of single and multistage canned motor pumps are guided by two identical self-lubricated slide bearings. The stator of the drive motor is separated from the rotor by using a thin liner sheet called as can.

The rotor cavity along with the hydraulic section of the pump creates a combined cavity which must be filled with the pumping liquid before starting the pump. The heat loss from the motor is carried off by a partial flow of pumping liquid between the rotor and stator, at the same time, pumping fluid itself lubricates both the slide bearings in the rotor cavity. Both the stator and rotor can which is a hermetically sealed component and the motor housing acts as a safety containment. Due to this, canned motor pumps always ensure a higher safety levels especially while pumping dangerous, explosive, toxic and valuable fluids and maintains the safety standards of the plant.

Range

  • Delivery size: up to 250 mm
  • 3 Capacity: up to 1000m3/hr
  • Head: up to 350 m
  • Temperature: -40oC to 420oC
  • Working Pressure: up to 120 Kg/cm2
  • Speed: 3000 RPM (Syn) & 1500 RPM (Syn) n
  • Voltage: 415V, 50 Hz 3 Phase /480V, 60 Hz 3 Phase

Special Features

  • No seal-no leakage
  • No coupling-no alignment and no vibration problem
  • No separate lubrication of bearing and no contamination of lubricant
  • No antifriction bearings
  • Small and compact design resulting in saving in installation space
  • Easy maintenance and longer life
  • Extremely low noise level Absolute safety from risks of fire
  • Automatic thrust balancing Vacuum tight construction prevents air contamination of process liquids
  • Retrofit Your Existing Pump

Applications

The high reliability of these pumps makes them suitable for pumping of toxic, hazardous liquids, high temperature, and high pressure services in nuclear power plant, Lithium Bromide circulation in refrigeration plant, Ammonia transfer in fertilizer plants, refineries, chemical and pharmaceutical industries and other process industries for handling toxic, hazardous or expensive fluids.

Construction Features

Canned Motor Pump is a centrifugal pump with pump and hermetically sealed electric motor mounted on single shaft thus eliminating the requirement of mechanical seal or other sealing device. Entire rotating assembly is immersed in the liquid, and motor stator and rotor are isolated from the pumped liquid with corrosion resistant, non-magnetic liner and sleeve. A part of the pumped liquid is by-passed through the motor, for cooling of motor and lubricating the bearing.

Canned Motor Pump is a centrifugal pump with pump and hermetically sealed electric motor mounted on single shaft thus eliminating the requirement of mechanical seal or other sealing device. Entire rotating assembly is immersed in the liquid, and motor stator and rotor are isolated from the pumped liquid with corrosion resistant, non-magnetic liner and sleeve. A part of the pumped liquid is by-passed through the motor, for cooling of motor and lubricating the bearing.

Axial suction and top centre line delivery. Smooth hydraulic passages for high efficiency. Volute type casing connected to liner disc and adapter plate.

Enclosed/semi-open type, statically and dynamically balanced. Hydraulic balancing of impeller achieved by means of automatic thrust balance arrangement. Auxiliary impeller for bearing lubrication and motor cooling is also available.

Canned Motor Pump is a centrifugal pump with pump and hermetically sealed electric motor mounted on single shaft thus eliminating the requirement of mechanical seal or other sealing device. Entire rotating assembly is immersed in the liquid, and motor stator and rotor are isolated from the pumped liquid with corrosion resistant, non-magnetic liner and sleeve. A part of the pumped liquid is by-passed through the motor, for cooling of motor and lubricating the bearing.

Clockwise viewed from driving end.

2/4 pole, 3 phase, 415V/480V, 50 Hz/60 Hz, Class of insulation F, H or C. Flame-proof and explosion proof construction with built-in safety devices available.

  • Standard: Drilled to ANSI-B 16.5 Class 300.
  • Optional: Drilled to DIN/IS/ASA/BS.

Material Of Construction

  • Casing: Stainless Steel, CF8M, CF3M, WCB,CI
  • Impeller/Auxiliary Impeller: Stainless Steel, CF8M, CF3M,WCB,CI
  • Stator Liner: Hastelloy, Inconel, SS316L
  • Rotor Sleeve: Hastelloy, Inconel, SS316L
  • Bearing: Silicon Carbide Ceramic, Carbon graphite
  • Thrust washer: Tungsten Carbide, SS316L with HCR/Ceramic coating
  • Shaft Sleeve: Tungsten Carbide, SS316L with HCR/Ceramic coating.

Features Of Flowdyne Sealless

The FLOWDYNE Sealless is a compact centrifugal canned motor pump with integrated motor that covers high-pressure and high-temperature applications.

Directly integrating the canned motor into the centrifugal pump does not only ensure environmental protection, but also safety at the plant. All parts of the pump are also designed for easy and fast maintenance. Therefore, you can minimize unproductive down times.

Compared to solenoid driven pumps, the FLOWDYNE canned motor pump features considerably better high-pressure properties. Therefore, it is ideally suited for transfer and circulation tasks with critical or hazardous fluids.

Since the fluids lubricate the sliding parts, no additional lubrication is required. This gives the pumps a high degree of serviceability.

Due to the integrated structure of the centrifugal canned motor pump, it only needs very little space and is ideal for applications in which a small footprint is required.

The pump is quiet and has low vibration. It is extremely weather-resistant and has good dust protection.

The pump has only low maintenance costs due to the relatively low number of components and the real-time monitoring of the bearing wear.

Major Problems Of Magnetic Coupling/drive Pumps

  • Separate Coupling And Motor

  • Coupling Misalignment

  • No Provision For Secondary Leak Containment

  • Frequent Rubbing And Galling By Both Internal & External Magnets

  • Inherent Excessive Magnet Slip Resulting In Severe Vibration

  • Temperature (200 C Max.)& Pressure (40 Bar Max.) Limitation

  • Not Possible To Assemble Or Disassemble Drive Or Driven Magnets At Site

Benefits Of Flowdyne Sealless Canned Motor Pumps

  • Pump & Motor Integral And Junction Box Sealed.
  • No Coupling. No Alignment Required.
  • No Mechanical Seals. No Leak Paths.
  • No Down Time, No Replacement Or Maintenance Cost Due To Seal Failure.
  • Secondary Containment Ensures Zero Leakage At All Condition – Even On Pump Failure.
  • No External Lubrication Required.
  • Motor Is Completely Protected From Fluid And Atmosphere. Not Exposedto Wear And Tear Or Environmental Deterioration. 
  • Motor Comes With Class ‘h’ Or ‘c’ Insulation And Explosion Proof Rating.
  • Tight Holding Of Vacuum. 
  • Hermatically Sealed Design Prevents Aircontamination Of Process Fluid Under Vacuum Condition.
  • Pump Comprises Of Very Few Parts. Rotor And Impeller Are The Only Moving Parts.
  • Bearing Are The Only Replaceable Parts With Minimum Life Of 5 Years,normally Very Much Longer.  
  • Bearing Replacement Can Be Done In 15minutes Even By Untrained Personnel.
  • Better Dynamic Balance Enhanced By One Piece Rotor Assembly Including Impeller, Sleeve,
  • Pump Shaft And Motor Rotor.
    Pump Run With Negligible Vibration And Noise Level. No Need Large Heavy Base Plate Or Rigid Foundation.
  • Compact & Need Just About 33% Of Installation Space Require Comparedto Conventional Pump.
  • Diagnostic Systems Protect The Pump From Damage (Frg).

Bearing Wear Indicator

  • Monitor current conditions
  • Develop data-based preventative maintenance schedules
  • Monitors and indicates rate of radial bearing wear 
  • Detects lost phase 
  • Shows reverse rotation 

Principle of Operation

  1. The FRG meter operates on the principle of induced voltage. A magnetic field is created in the TRG coils by the current flowing through the stator winding. In addition, a magnetic field is created by induced currents in the rotor. 
  2. When the rotor is perfectly cantered in the stator, the two magnetic fields are essentially concentric or balanced. 
  3. When bearing wear occurs and the gap between the rotor and stator decreases, a magnetic flux created by the imbalance in the magnetic fields causes an induced voltage in the FRG coils. 
  4. This voltage is indicated on the FRG voltmeter. The meter is mounted on the pump terminal box as standard but is available as remote panel-mount.