Understanding where explosive atmospheres may occur is fundamental to safe plant design, operation and maintenance.
Whether you're developing a new facility, modifying existing plant or reviewing existing documentation, effective classification for Hazardous Areas provides the foundation for managing explosion risks, selecting suitable equipment and meeting your legal obligations under DSEAR.
Vital Ex Engineering provides independent Hazardous Area Classification studies and DSEAR Risk Assessments for organisations operating in high-hazard industries across the UK and internationally. Our assessments are undertaken in accordance with DSEAR and relevant BS EN IEC 60079 standards, providing a robust basis for compliance, equipment selection and explosion risk management.
Hazardous Area Classification
Hazardous Area Classification (HAC) identifies where explosive atmospheres may occur and defines the extent of hazardous zones. Accurate classification supports safe equipment selection, effective risk management and compliance with DSEAR and relevant hazardous area standards.
We carry out Hazardous Area Classification for new and existing facilities, assessing hazardous substances, potential release sources, ventilation arrangements and operating conditions to determine the extent of hazardous zones and the risks associated with them. Typical deliverables include:
- Hazardous Areas Classification reports and drawings
- Zone schedules
- Equipment selection guidance
- Hazardous area review for plant modifications and change projects
- DSEAR assessments
Good Hazardous Area Classification relies on sound engineering judgement and accurately reflects the plant, process and sources of release.
Many organisations only review their classifications following significant process changes. However, ageing documentation, plant modifications and evolving site conditions can all affect the validity of an existing assessment. Read our insight article below to learn more about when a review may be required.
DSEAR Risk Assessments
A DSEAR Risk Assessment should do more than identify hazardous zones. It should assess the likelihood of explosive atmospheres occurring, identify potential ignition sources and demonstrate that risks have been reduced so far as is reasonably practicable.
Our assessments help organisations:
- Understand explosion and fire risks
- Identify potential ignition sources
- Review existing control measures
- Demonstrate compliance with legal requirements
- Prioritise practical risk reduction measures
- Support audits and regulatory inspections
We provide clear, practical recommendations that support both compliance and operational efficiency.
Many organisations already have a DSEAR assessment in place but are unsure whether it remains suitable following process changes, plant modifications or the introduction of new hazardous substances. We can review existing assessments, identify compliance gaps and recommend any necessary updates.
Read our insight article below to learn what makes a good DSEAR assessment and how to achieve compliance.
Support Throughout the Project Lifecycle
Every facility presents different hazards and operating conditions. We take a practical, evidence-based approach that combines compliance requirements with sound engineering judgement.
Our work typically includes:
- Review of process information and hazardous substances.
- Identification of release sources and operating conditions.
- Assessment of release characteristics and ventilation.
- Determination of hazardous areas and zones.
- Preparation or review of hazardous area documentation and drawings.
- Practical recommendations to support compliance and equipment selection.
If required, we can also support hazardous area design verification, equipment assessments and plant modification projects, helping ensure consistency between Hazardous Area Classification, DSEAR compliance and equipment selection throughout the project lifecycle.
We support organisations across high-hazard industries including oil and gas, chemicals, hydrogen, energy, pharmaceuticals, food and beverage, waste and recycling, and bulk storage. We also support COMAH establishments with hazardous area and DSEAR compliance.