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Canned Motor Pumps for Research Facilities

Canned Motor Pumps for Research Facilities
7 May 2024  |
As part of environmental and climate protection, industrial refrigeration technology is increasingly demanding solutions that reduce direct emissions of refrigerants as well as overall energy consumption. Another important area where refrigeration systems are used is research into the material behaviour of components in the low-temperature range.

Your benefits:

  • Broad portfolio: extensive standard portfolio as well as the development and manufacture of customer specific (ETO) pumps
  • Products with a long service life: no dynamic seals and non-contact running on hydrodynamic slide bearings ensure almost wear-free operation
  • Knowledge and experience: pump specialist for canned motor pumps for over 50 years

Typical areas of application:

  • Research on refrigeration systems
  • Research with refrigeration systems

Research project – phase change material in industrial CO2 refrigeration systems


The research project investigates the extent to which thermal energy can be
stored at low load times in phase change materials (PCM) for reuse during
peak loads. In the pilot plant, the refrigerant CO2
circulates in a temperature
range from 5 °C to –50 °C with a maximum nominal pressure of 52 bar. The
pump works at various operating points by using the frequency inverter.
Further requirements include absolute leak-tightness and a low MTBF value
(mean time between failure) and thus maximum reliability of the pump used.

Delivery rate: 1.5 m³/h to 10 m³/h
Pumping head: 40 m
Operating temperature: 5°C to –50°C
Refrigerant: CO2
System type: CO2 refrigeration system

The pump used

For the pilot plant, HERMETIC together with its Norwegian agent Finesterra AS
supplied a four-stage canned motor pump of the type CAMh 2/4 with AGX3.0
motor specifically designed for CO2
applications. The generously dimensioned
plain bearings made of modern sintered materials enable the pump to run
practically without wear. The design and material selection ensure the nominal
pressure of 52 bar and the test pressure of 78 bar.

Medium / refrigerant

Carbon dioxide is increasingly used as a refrigerant. Particularly popular are supermarket refrigeration and industrial refrigeration systems. CO2 is used in different forms, subcritical in cascade systems, transcritical in pure CO2 systems or as a secondary fluid. The advantages of carbon dioxide are the particularly good heat transfer coefficient, exceptionally low viscosity and high environmental compatibility.

Everything you need to know about CO2 is available here.

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HERMETIC-Pumpen GmbH is a leading developer and manufacturer of hermetically sealed pumps and pumping technologies. The specialist for canned motor pumps has earned a worldwide reputation for its safe and long-lasting pumps, which can be...

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