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Hazardous Area Classification for Gases and Liquids

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HSE runs three different courses to help employers comply with the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR).

While there is some overlap between the courses delegates can attend one or more courses depending on which area of DSEAR they are interested in.


The Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) require that areas where accidental releases of dangerous substances could occur are identified and classified according to the likelihood of the formation of a flammable atmosphere. Within classified areas sources of ignition should be controlled. This course is designed to provide delegates with the knowledge to carry out straightforward hazardous area classification in accordance with commonly used standards or to act as an intelligent customer when contracting others to deliver this role.

The course covers

CPD Certified

  • The classification of hazardous substances
  • The relevance of the physical/chemical properties of gases, liquids and mists to area classification
  • The classification of hazardous areas by zone, including the concept of a zone of negligible extent (NE)
  • The importance of ventilation in area classification and the concept of Vz
  • The Quadvent approach to area classification
  • The national and international standards and guidance commonly used in area classification including practical examples of their use
  • An introduction to equipment for use in explosive atmospheres

Who should attend

This course is suitable for those who may be asked to carry out hazardous area classification as part of a DSEAR assessment including process safety and electrical engineers, and health and safety practitioners.

This course is suitable for those who require a more detailed understanding of the process of hazardous area classification including process safety and electrical engineers, and health and safety practitioners.

For a higher level introduction to hazardous area classification the  DSEAR - Gases and Liquids course would be more appropriate.

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All you'll need is an internet-connected computer, laptop or tablet plus webcam and microphone. We do not recommend using a smartphone. Before you book, you can check that you meet the  Zoom System Requirements and run a diagnostic test to ensure the software is compatible with your firewall settings - if it doesn't work, try adjusting your settings or contact your IT department about permitting the website.

Printed course material will be delivered direct to your door and even include a little treat for you to enjoy on your coffee break!

If you would like training delivered specifically for your organisation we can use other platforms such as MSTeams, so please get in touch to discuss your requirements.


The cost of the course is £650 per person (includes course notes and certificate of attendance).

Book Course

Please note that all courses must be paid for via credit card at the time of booking.

For further dates and additional information email: or contact the Training and Events Team at HSE directly on +44 (0)203 028 3704.

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