DSEAR & ATEX

Explosive Atmosphere Risk Assessment for High-Hazard Sites

Risk Assessment & Compliance Across the UK

Arthian provides expert DSEAR risk assessments and hazardous area classification services for workplaces where flammable gases, vapours, mists or dusts are present. Our work helps clients meet legal obligations, protect people, and maintain safe operations.

We’ve supported facilities across the UK in:

Distilling and drinks production
Food and pharmaceutical manufacturing
Chemical handling and powder processing
Energy from waste and renewables
Industrial gases, fuels and bulk storage

Our assessments are tailored to your site, substances and regulatory context—ensuring compliance with DSEAR 2002, ATEX 99/92/EC, and relevant HSE guidance.

What Is DSEAR and Why Does It Matter?

The Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) require employers to assess and control risks from flammable gases, vapours, mists, dusts and corrosive substances. A DSEAR assessment is legally required:

For any workplace handling dangerous substances
When introducing new processes or materials
Following a near miss, incident or process change
Every 3–5 years as part of ongoing compliance

Our DSEAR & HAC Services

We help clients meet their duties under DSEAR by identifying hazards, evaluating ignition risks, and recommending proportionate controls.

DSEAR Risk Assessment and Site Survey

Hazardous Area Classification and Zoning

HAC Drawings and Equipment Review

Explosion Protection and Prevention Measures

ATEX Compliance Support

DSEAR Risk Assessment and Site Survey

We help clients meet their obligations under the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) through thorough site-based evaluations.

Our services include:

Detailed site surveys to identify hazardous substances and ignition risks
Assessment of workplace conditions and potential for explosive atmospheres
Evaluation of existing control measures and identification of gaps
Recommendations for proportionate, compliant risk mitigation strategies

Hazardous Area Classification and Zoning

We help clients manage ignition risks by defining hazardous zones in line with regulatory standards and best practice.

Our services include:

Identification of flammable substances and potential release sources
Definition of hazardous zones (e.g. Zone 0, 1, 2) based on frequency and duration of explosive atmospheres
Recommendations for equipment selection and installation in accordance with zoning requirements
Support for compliance with DSEAR, ATEX, and IEC standards

hazardous area classification drawings process safety

HAC Drawings and Equipment Review

We support safe and compliant operations by producing accurate Hazardous Area Classification (HAC) drawings and reviewing installed equipment against zone-specific requirements.

Our services include:

Development of HAC drawings to clearly define hazardous zones across site areas
Review of installed equipment for suitability within classified zones (e.g. Zone 0, 1, 2)
Verification of compliance with DSEAR, ATEX, and IEC standards
Identification of gaps or non-conformances and recommendations for corrective action

Our detailed outputs help clients maintain regulatory confidence and ensure safe installation across hazardous environments.

Explosion Protection & Prevention Measures HAC Process Safety

Explosion Protection and Prevention Measures

We help clients reduce explosion risks through tailored strategies that support safe, compliant operations.

Our services include:

Ventilation design to disperse flammable atmospheres and minimise ignition potential
Containment solutions to isolate hazardous materials and prevent escalation
Ignition control measures including equipment selection and zoning compliance
Recommendations aligned with DSEAR, ATEX, and IEC standards

Our risk-based approach ensures proportionate protection that meets regulatory expectations and safeguards personnel and assets.

ATEX Compliance Support

We provide expert guidance on ATEX directives to help clients manage explosive atmosphere risks and meet EU and UK regulatory standards.

Our services include:

Interpretation of ATEX requirements for equipment and operational procedures
Review of installed systems for compliance with zone classifications and equipment categories
Support with documentation, technical files, and conformity assessments
Alignment with DSEAR and UKCA/CE marking obligations

Our practical, informed approach ensures your operations remain safe, compliant, and audit-ready across hazardous environments.