Think Sealless – WHAT is a Sealless Pump?

Essentially, sealless pumps are centrifugal pumps without packed glands or seals. Instead of a seal, there is a static containment shell or shroud, which forms a completely sealed liquid end or pressure boundary.

Prime mover energy is transmitted to the sealed liquid end by a bank of external magnets, which pass force through the containment shell to the inner magnets attached to the impeller shaft, meaning there is no risk of leaks or emissions.

Sealless v Sealed Pumps

It’s necessary to understand what a mechanical seal is to differentiate between the two types of pump. Mechanical seals are designed to maintain their sealing capability by leaking small amounts of fluid in order to keep the seal faces lubricated.

Mechanical seals are widely regarded as the weakest point in any pumping system. In fact, they account for 80% of all pump failures, with the remainder being leakage through static seals such as gaskets or O Rings and bearing failure.

Seals, like bearings, will ultimately wear and, as they wear, the seal faces lose their effectiveness and liquid loss through the seal increases. These fugitive emissions can be costly, resulting in lost time and money, as well as reduced worksite and environmental safety.

WHAT makes a HMD Kontro Sealless Pump different?

  • Welded metal containment shell to ASME VIII pressure vessel standards
  • Optional ZeroLoss® shell. To improve efficiency and reduce life cycle costs
  • Dynamically balanced rotating parts for smooth operation and longevity
  • Modular cartridge construction reducing maintenance time
  • Many common components reducing spare part inventory
  • Fully encapsulated outer magnet ring for protection and easy cleaning

How HMD Kontro can help you with your pump requirements

HMD Kontro has a comprehensive range of magnetic drive sealless pumps designed to perform in most climate extremes and in many applications to help you revolutionise your process workflow.  To find out more please click here.


The (Multi) Stage is Set For the Space and Cost Saving GSPX Pump

High head performance is delivered with this easy to install and compactly packaged pump. The GSPX is a General Service Petroleum Oil & Gas sealless magnetic drive pump built to API 685 specifications.

A multi-stage derivative of the GSP range, the GSPX is a leak-free pump for safe and efficient high-differential pressure operations, suitable for petrochemical processing, petroleum production and refining, offshore oil and chemical processing applications. It is typically used for handling hazardous and valuable hydrocarbons and chemicals in toxic, aggressive, hot, crystallising and high value processes.

Total product containment is ensured with the sealless design and you are guaranteed convenience and reduced spare parts holding due to the pump’s interchangeable components and commonality with the GSP range. The GSPX is also available in a range of materials including bespoke engineered options so that your multi-stage pump can be tailored to your specific application requirements.

Benefits of the HMD Kontro GSPX Pump include:

  • Multiple inline stages in an end-suction configuration
  • Compact package and easy plant installation
  • BB5 barrel style design
  • API compliant with no tie bolts
  • Interchangeable parts for reduced inventory
  • Based on the proven Frame 2 magnetic drive pump
  • 2 or 3 stage options available
  • 2 diffuser based hydraulic options

The GSPX produces higher differential pressures than single stage models and is available with 2 or 3 inline stages, 2 diffuser based hydraulic options and as an end suction configuration. If you are looking for more efficiency, the optional ZeroLoss® containment shell can be fitted which will help to eliminate coupling losses and heating of the process liquid

Please Contact Us for more information  If you would like more details about the GSPX pump, call +44(0)1323 452000 or email