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ams@airmovementsystems.co.uk 

ATEX / DSEAR 

DSEAR became UK law on 1st July 2003 with a transitional period allowing existing facilities 3 years to comply.  
 
This period is now over which means all facilities must now comply. Our fully trained staff help and advice on new installations and upgrading existing plant to meet the new regulations. 

Quick guide to ATEX DSEAR regulations... 

What is ATEX? 

ATEX is the name commonly given to the procedure for controlling explosive atmospheres and the standards of equipment and systems used. It is based on the following European Directives. 
 
1) Directive 99/92/EC ('ATEX Workplace Directive’) on minimum requirements for improving the health and safety protection of workers potentially at risk from explosive atmospheres. 
 
 
 
 
 
 

What is DSEAR? 

DSEAR stands for the Dangerous Substances and Explosive Atmospheres Regulations 2002. 
 
Dangerous substances can put people’s safety, at risk from fire and explosion. DSEAR puts duties on employers and the self-employed to protect people from risks to their safety from fires, explosions, and similar events in the workplace, this includes members of the public who may be put at risk by work activity. 
 
 
 
 
 
 

What is an explosive atmosphere? 

An explosive atmosphere is defined as a mixture of dangerous substances with air, under atmospheric conditions, in the form of gases, vapours, mist or dust in which, after ignition has occurred, combustion spreads to the entire unburned mixture. 
 
Atmospheric conditions and ambient temperatures are commonly referred to as temperatures of –20°C to 40°C and pressures of 0.8 to 1.1 bar. 

Employer’s requirements 

Identify which dangerous substances are in their workplace then identify the fire and explosion risks. Then to establish control measures to remove those risks, or where this is not possible, how to control them and reduce their effects. Identify and classify areas of the workplace where explosive atmospheres may occur and avoid ignition sources in those areas. Prepare plans and procedures to deal with accidents, incidents and emergencies involving dangerous substances. 
 
Make sure employees are properly trained to control or deal with the risks from the dangerous substances; www.hse.gov.uk/fireandexplosion/ 

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