What Are the Components of a Magnetic Sealless Pump?

What Are the Components of a Magnetic Sealless Pump?

A magnetic sealless pump is ideal for applications that require leak-free reliability supported by superior design and construction. However, it is important to choose the right pump for each job. Familiarity with the various components of a magnetic sealless pump is valuable to understanding how the pump operates. Knowledge of these parts will also prove helpful for proper pump maintenance.

The following overview includes the basic components of a magnetic sealless pump.

Parts of a Magnetic Sealless Pump

1. Housing

The housing is also known as the casing, impeller housing, front housing, and front casing. Located at the front of the pump, the housing contains the suction and discharge connections as well as a thrust ring. In many magnetic sealless pump models, the housing also contains a support for the internal shaft on which the impeller rotates.

2. Impeller

The impeller, or more specifically, the impeller magnet assembly, contains a thrust ring which partners with the thrust ring located inside the housing. Together, the rings guide fluid into the eye of the impeller and absorb any forward thrust in the pump.

3. Impeller Drive

Also referred to as the inner drive magnet, the impeller drive is connected to the impeller and contains the powerful magnets that drive the pump. These magnets are typically encased in plastic for protection from corrosion.

4. Bushing

The radial bushing or bearing bushing is located inside the impeller drive. In conjunction with the shaft, the bushing keeps the impeller drive centered inside the pump. The bushing can be manufactured from a variety of materials including carbon, PTFE, high purity ceramic, and silicon carbide.

5. Pump Shaft

The shaft supports the rotating impeller/impeller drive assembly and prevents the impeller from being magnetically attracted to the drive magnet assembly that is located on the outside of the pump. Thus the shaft plays an important role in preventing contact between the barrier and the drive magnet assembly, contact that would damage the pump.

6. Barrier

The barrier is also known as the containment shell, rear casing, or rear housing. Located at the rear of the pump near the motor, the barrier on a magnetic sealless pump is solid. This differs from a mechanically sealed pump, which has an opening in the barrier that also serves as a primary potential leak point in sealed pump designs.

7. Housing O-ring

The housing O-ring seals the pump to prevent leaks. It is situated between the impeller housing and the barrier.

8. Drive Magnet Assembly

This vital component is known by many names, including the outer drive magnet, drive magnet assembly, outer magnet assembly, and outer magnet ring. It is connected to the motor shaft and contains the magnets that rotate the impeller drive inside the pump when the motor shaft rotates.

9. Clamp Ring/Motor Adapter

Also referred to as the containment ring, coupling housing, or motor bracket. This component connects the wet end of the pump to the motor.

10. Magnets

The magnets that drive a magnetic sealless pump can be of various strengths and constructed of a variety of materials. Options available in the market today include ferrite (also known as ceramic magnets), a mixture of ceramic and neodymium, samarium cobalt, and neodymium. Neodymium and samarium cobalt are considered “Rare Earth” magnets, and neodymium being the strongest known permanent magnetic material.

11. Motor

There are a wide range of motor types that can potentially drive a magnetic sealless pump. A specific motor is typically selected for maximum pump compatibility. If the pump features weaker magnetic materials such as ferrite, a specialized slow-start motor may be required to prevent decoupling at start-up. If the pump is driven by stronger magnets, the motor selection is broader. Motors are typically rated as chemical duty, TEFC, wash-down duty, and hazardous location (explosion-proof).

Finish Thompson’s Complete Line of Drum Pumps

Finish Thompson offers a full line of magnetic sealless pumps, with models suited for for virtually every application. These pumps offer rugged construction, reliable operation, and industry-leading warranties. Use the links below to discover the perfect magnetic sealless pump for your need.

DB Series Magnetic Sealless Pump

  • High efficiency
  • Rugged construction
  • Strongest neodymium magnets
  • Hours of run-dry capability
  • 5-year manufacturer’s warranty
Finish Thompson DB Series Pump

MSDB Series Multi-Stage Chemical Transfer Pump

  • Based on the reliable DB series
  • Ideal for high-head, low flow applications
  • Over 300 feet (91 meters) of maximum head
  • Extended run-dry ability
  • 5-year manufacturer’s warranty
Finish Thompson MSDB Series Pump

SP Series Self-Priming Chemical Transfer Pump

  • Lightning-fast priming
  • No seals, so there are no leaks
  • Deep lift abilities
  • Corrosion resistant
  • 5-year warranty
Finish Thompson SP Series Pump

UC Series ANSI Dimensional Chemical Transfer Pump

  • Heavy-duty ductile iron construction
  • EFTE lined housing and wetted components
  • Leak-free operation
  • Powerful neodymium magnets
  • 2-year manufacturer’s warranty
Finish Thompson UC Series Pump

About Finish Thompson

Finish Thompson Inc. designs and manufactures pumps for the safe transfer of a wide variety of corrosive liquids. Products include centrifugal sealless magnetic drive pumps with run-dry capability, mechanically sealed pumps, drum and barrel pumps, vertical mag-drive pumps, multi-stage pumps, and the FTI Air line of air operated double diaphragm (AODD) pumps. For durable solutions for your applications, contact Finish Thompson Inc.