Simplifying Complexity. Delivering Safety.
Simplifying Complexity.
Delivering Safety.
Home / Case Studies / Motor Systems for Low Temperature Applications

Motor Systems for Low Temperature Applications


Motor Purge capable of operating in extreme environments 



As oil & gas extraction has pushed into new, often more extreme environments, both the use and the protection of large motors starts to become problematic. A major motor OEM brought us a challenge to develop a motor purge system capable of operating in very low ambient temperatures. 


Expo Solution

Very low ambient temperature plays havoc with electronic components such as LCDs and with the mechanical strengths of steels and plastics, leading to premature failure through reduced resistance to vibration and impact loading. Purge & Pressurization (Ex p) standards expect the purge air to be between -20°C and

+40°C and offer limited guidance on how to handle lower extremes. Most purge systems are certified for use between -20°C and +55°C. Long exposed outlet piping from site air compressors often leads to the purge air becoming very cold, making a ‘black start’ very time-consuming, even with anti-condensation heaters inside the motor framework. 

Building on Expo’s proven purge systems and CLAPS technology, we developed a range of heated motor purge units that could push the ambient as low as -60°C.. Using Ex-certified heating components, high-efficiency insulation, and incorporating monitoring systems for critical temperatures, our low-temperature units have been successfully certified by a Notified Body, and are becoming industry standard for extreme temperature applications. 

If the instrument air supply is too cold: Where the temperature of the incoming air cannot be maintained, not only is there a risk of damage to equipment, but, critically, the system might be operating outside of its certification limits. Expo can provide users with additional security through a range of certified, in-line air heating units. These systems are specially designed for high flow applications and can be integrated into the overall motor purge installation.


Typical system


What Expo Needs to Know
  • Certification required
  • Ambient temperature limits
  • Machine dimensions and internal volume
  • Maximum enclosure leakage rate
  • Required purge time
  • Temperature of instrument air

Do you have a similar application?

We can tailor the solution to fit your exact needs

Contact our engineers

Got a question?

For more information contact your local partner to speak to one of our purge and pressurization experts or contact us.