Blower motors

Hermetic nitrogen blower motor

Randax has developed a hermetic nitrogen blower for Maillefer Oy, a global market leader in cable manufacturing equipment and systems. Nitrogen gas is used in the cable manufacturing process as a shielding gas, for example. The nitrogen blower transfers the nitrogen gas at a pressure of approx. 10 bar to the necessary points of the cable manufacturing process. The gas is at high pressure and contains small molecules, which sets high requirements for the blower. A high operating pressure requires a blower with a rigid structure, and the connections need to be tight in order to avoid leaks. The nitrogen blower is a key component in the cable manufacturing process.

In conventional blower solutions, continuous servicing has been required to ensure the durability and reliability of the dynamic seal, since the blower impeller is routed through the pressurised space and closed off with the seal. The blower motor has been located outside the pressurised space at atmospheric pressure.

The newly developed Randax® blower motor completely eliminates the need for a dynamic seal. The motor has been made hermetic and pressure resistant, which allows the process gas to enter it. Its blower hydraulics are based on a Sulzer A32-100 process pump, around which an integrated, hermetic and pressure-resistant bearing system and motor have been designed.

The key benefits of the new solution include:

High reliability, no maintenance

  • ‌No dynamic seal and related lubrication systems

Extremely quiet and stable operation

  • Rigid bearings and robust structure


  • Permanent magnet motor with high efficiency
  • ‌‌No dynamic seal and related energy waste