DSEAR Zones

Understanding DSEAR zones is crucial for workplaces that handle flammable gases, vapours, or dust. Correctly classifying hazardous areas helps prevent explosions and ensures compliance with UK safety regulations. For a complete overview of DSEAR and its requirements, read our Guide.

What Are DSEAR Zones?

DSEAR zones are designated areas where flammable substances could create explosive atmospheres. They help organisations manage the risk of ignition and implement the right safety measures. Zones are categorised based on the likelihood and duration of a hazardous atmosphere occurring:

• Gas zones: Zone 0,1,2
• Dust zones: Zone 20, 21, 22

Each zone has specific control requirements to reduce the risk of fire or explosion.

Zone Classification Explained

Gas Zones:

• Zone 0 - Continuous: Area where an explosive atmosphere is present continuously or for long periods
• Zone 1 - Likely: Area where an explosive atmosphere is likely during normal operation.
• Zone 2 - Unlikely: Area where an explosive atmosphere is not likely and, if it occurs, will only exist for short periods.

Dust Zones:

• Zone 20 - Continuous: Area where combustible dust is present continuously or for long periods.
• Zone 21 - Likely: Area where combustible dust is likely during normal operation.
• Zone 22 - Unlikely: Area where combustible dust is not likely and, if it occurs, will only exist for short periods.

This classification ensures that safety measures are proportionate to the risk.

Safety Requirements per Zone Once zones are identified, appropriate safety measures must be applied:

• Equipment Standards: Only ATEX-certified or equivalent equipment can be used in hazardous zones.
• Ventilation: Proper ventilation is critical to prevent the accumulation of flammable gases or dust.
• Monitoring and Detection: Install sensors to detect leaks or combustible concentrations.
• Employee Safety Measures: Ensure staff are trained and follow strict safety protocols.

Implementing these measure reduces the risk of ignition and helps maintain regulatory compliance.

Who should Determine DSEAR Zones?

DSEAR zones must be determined by a competent person with relevant experience and knowledge. For more information on who can legally carry out a DSEAR inspection, see our detailed article on Who can carry out a DSEAR inspection.

Conclusion & Next Steps

Correctly identifying and managing DSEAR zones is essential for workplace safety and compliance. To ensure your hazardous areas are properly assessed, consider using professional DSEAR services. Spiers provides comprehensive DSEAR risk assessments to help your business meet all legal requirements.