Dangerous Substances and Explosive Atmospheres Regulations

The Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) 2002 is a UK law which came into force on the 9th December 2002 and is a combination of two European Directives, 1999/92/EC, known as ATEX 137 directive and 98/24/EC, known as CAD, the Chemical Agents directive.

DSEAR set minimum requirements for the protection of workers from fire and explosion risks related to dangerous substances and potentially explosive atmospheres. According to DSEAR, all sites handling flammable materials capable of forming a potentially explosive atmosphere should have adequate protection against risks from fire, explosion and similar events arising from dangerous substances used or present in the workplace. From June 2015 DSEAR also covers the risk caused by gases under pressure and substances that are corrosive to metals.

In order to achieve compliance with DSEAR, employers must:

  • Identify the locations where dangerous substances and explosive atmospheres are in their workplace and what risks can be present;
  • Establish a suitable Basis of Safety to ensure that the control measures are in place to prevent or mitigate risks; and also to reduce the effects of any incidents involving dangerous substances;
  • Prepare plans and procedures to deal with accidents, incidents and emergencies involving dangerous substances;
  • Make sure employees are properly informed about and trained to control or deal with the risks from the dangerous substances;

  • Hazardous Area Classification of the workplace where explosive atmospheres may occur and avoid ignition sources in those areas by,
    • Determining the potential grade of release;
    • Estimate the extent of the release and classify into Zones;
    • Ensure that ignition sources that may be present in the Zones have the required degree of protection;
  • Document the results.

Our knowledge

Sigma-HSE (UK) Ltd, have extensive experience in carrying out DSEAR Assessments and our consultancy team consists of Process Safety Specialists who are very respected for their body of work and are experts in generating clear and precise reports with the most suitable Basis of Safety for each relevant operation and Hazardous Area Classification. Sigma-HSE is highly committed to continually deliver top quality services to achieve DSEAR compliance for the clients throughout the UK. For other European countries implementing ATEX Assessments please see our dedicated web page.

Get in touch

Sigma-HSE have a dedicated and experienced team of process safety specialists wth a passion for safety. Please call on +44 (0)1962 840570 to discuss your process safety concerns with Mike Weaver, our Technical Manager.

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