Dsear – Explosive atmospheres & chemicals

Explosion protection is a priority for a range of industries and manufacturers, from food and pharmaceuticals to energy and chemicals. Any process involving flammable gases, mists, vapours or combustible dusts requires explosion protection measures.


What is DSEAR?

DSEAR stands for the Dangerous Substances and Explosive Atmospheres Regulations 2002. Dangerous substances can put peoples’ safety at risk from fire, explosion and corrosion of metal. A Dsear report under the 2002 Dsear act is in addition to a fire risk assessment.

The requirements expect that considerations are given too all activities where either directly or indirectly an event may occur which may cause either an explosion or to release into the air in the locality of the premises particulate that may be considered harmful or a risk to others.

Where a commercial property is within the locality of residential dwellings then the expectations are that both life safety, consequential issues and risks to the public have to be covered.

Dangerous substances can put peoples’ safety at risk from fire, explosion and corrosion of metal. DSEAR puts duties on employers and the self-employed to protect people from these risks to their safety in the workplace, and to members of the public who may be put at risk by work activity.

What are dangerous substances?

Dangerous substances are any substances used or present at work that could, if not properly controlled, cause harm to people as a result of a fire or explosion or corrosion of metal. They can be found in nearly all workplaces and include such things as solvents, paints, varnishes, flammable gases, such as liquid petroleum gas (LPG), dusts from machining and sanding operations, dusts from foodstuffs, pressurised gases and substances corrosive to metal.

What does DSEAR require?

Employers must:

  • find out what dangerous substances are in their workplace and what the risks are
    put control measures in place to either remove those risks or, where this is not possible, control them and put controls in place to reduce the effects of any incidents involving dangerous substances
  • prepare plans and procedures to deal with accidents, incidents and emergencies involving dangerous substances and make sure employees are properly informed about and trained to control or deal with the risks from the dangerous substances and identify and classify areas of the workplace where explosive atmospheres may occur and avoid ignition sources (from unprotected equipment, for example) in those areas.

Due to the potential issues from a fire or explosion undertaken the terms of Dsear it is essential that the client has also taken due reference from both the local FRS, the HSE and the local authority as it is likely that licenses make be required for some of the activities undertaken.

You will still need to have a formal FRA which should dovetail with the Dsear reports findings to give you a clear direction of travel for both protection measures and training on site.

Additional Documentation

Fire Detection for Hazardous Areas – Apollo Fire

How can we help?


With extensive experience partnering with high hazard industries, we have the expertise and resources to advise you regarding explosion risks, safety measures, training and more. You’ll get:

  • Expert advice on explosion protection topics
  • Safe processes and reduced explosion risk
  • Reliable support in questions of compliance

Veritas Fire Support can also serve as expert witnesses and carry out incident investigations.

Dsear reporting
Our Approach

Working closely with you, we design solutions that meet your needs, whether advising you on ATEX/NFPA or other regulatory topics, assessing explosion hazards and workplace risk or conducting inspections to ensure safe processes. The services we provide relate to:

  • ATEX
  • NFPA
  • Chemical/Powder Testing
  • Hazardous Area Classification
  • Ignition Hazards Assessment (e.g. Electrostatics, Mechanical Equipment Ignition Risk Assessment etc.)
  • Consequence Modelling
  • Explosion Vent Sizing
  • Dust Explosion Hazards (e.g. Dust Hazard Assessments – DHAs)
  • Gas/Liquid Explosion Hazards
  • Equipment Inspection
  • Incident Investigation


Veritas can support you if business in respect of this work, a bespoke appraisal of the risk issues, the required actions and liaison with other interested parties.

Contact us for a free no obligation discussion – Call 07831 222767 or 01502 797035
Email us at info@veritasfiresupport.co.uk


Dangerous vs. Safe batteries, Explosion and fire test! Credit: GWL Power

The Birmingham custard factory explosion. Credit: Epicreconstruction

Combustible Wood Dust Explosions. Credit: WorkSafeBC

Dust Explosion – Penn State Extension Demonstration. Credit: AgSafety4U

Additional Reading