Simplifying Complexity. Delivering Safety.
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Delivering Safety.
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Chemical engineering


Supporting a specialised engineering and construction firm on the upgrade of a processing & packaging line for specialty chemicals.

Project Brief

The nature of the customer's plant and products meant that the speciality chemical packaging equipment would be installed in a classified hazardous environment. The control & monitoring systems functioned most effectively when located close to the packaging line, so there was a need to protect these systems, with a few modifications as possible. 

The customer viewed purge and pressurization (Ex p) as the most cost-effective solution and, additonally, permitted easier access for system maintenance, compared to using flame-proof/explosion-proof (Ex d) protection. The environment was classified as Class I, Division 1.


A Purge and pressurization system that was able to protect the controls equipment and meet the Class I, Division 1 hazardous area requirements, including power isolation, while permitting periodic maintenance  
Thus the electronics could easily be installed close to the process.

Expo Products and Services
  • Type X purge & pressurization system
  • MiniPurge Interface Unit (MIU) for power isolation
  • Bypass facility for periodic maintenance of the control system

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