DSEAR Gas and Liquid Explosion Risk Assessment Training for Duty Holders
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Course Duration: Approximately 2 hours
Flammable gases and vapours from liquids can create explosive atmospheres during everyday work, from solvent transfer and drum filling to storage, cleaning and maintenance. Under the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR), duty holders must understand where releases can occur, how ignition could happen and whether existing controls are enough.
This DSEAR Gas and Liquid Explosion Risk Assessment Training helps organisations carry out more consistent, defensible assessments of gas and vapour explosion risk. It gives duty holders a practical framework for identifying dangerous substances, evaluating release and ignition scenarios, selecting suitable controls and recognising when specialist input is needed.
This DSEAR Gas and Liquid Explosion Risk Assessment Training is for anyone with legal or operational responsibility for managing flammable gas and vapour explosion risk under DSEAR, particularly in workplaces where solvent handling, gas storage, flammable liquid transfer and hazardous area classification create significant compliance responsibilities.
It is suitable for:
Site managers and operations managers
Health and safety managers and advisers
Compliance officers and EHS leads
Facilities engineers and maintenance managers
Process and production managers
DSEAR duty holders and responsible persons
Course Content
The DSEAR Gas and Liquid Explosion Risk Assessment Training for Duty Holders contains the following modules:
Understand what DSEAR requires and how it fits within the wider UK health and safety framework for managing fire and explosion risk from flammable gases and vapour released from flammable liquids.
What is DSEAR?
DSEAR Structure & Guidance
UK Legislation
European Legal Background
Understand the purpose and scope of a DSEAR risk assessment for gas and liquid hazards. Learn how gas and liquid explosive atmospheres form through the Buncefield incident and what the science behind vapour cloud explosions means for risk assessment in practice.
Purpose & Scope
The Incident at Buncefield
Understanding Gas & Liquid Explosion Science
Understand the full hierarchy of control available under DSEAR, how hazardous areas are classified for gas and liquid risks and how suitable control measures and equipment decisions are determined and applied in practice.
Choosing Controls
Substitution
Engineering Controls
Hazardous Area Classification
Hazardous Area Classification in Practice
Equipment Categories & Selection Principles
Equipment Ratings & Labelling
Emergency Preparedness
Personal Protective Equipment (PPE)
Follow the full DSEAR gas and liquid explosion risk assessment process through a practical workplace example, from hazard identification and risk evaluation to control selection, review and recording findings.
Hazard Identification
Assessment of the Risks
Risk Controls
Reviewing & Revising
Recording Findings
What Your Staff Will Learn
By completing this training, duty holders will be able to:
Understand DSEAR requirements where flammable gases and vapour released from flammable liquids create a fire or explosion risk.
Recognise how gas and vapour explosive atmospheres form, including how flash point, LEL and vapour density affect the risk in practice.
Identify the dangerous substances, release points and ignition sources that must be considered in a robust gas and liquid DSEAR risk assessment.
Use gas and vapour data, including flash point, LEL, UEL, AIT and MIE, to judge hazard severity and support proportionate control decisions.
Apply the DSEAR hierarchy of control to gas and vapour risks and identify which measures matter most in practice.
Understand how hazardous area classification is carried out, how gas and vapour zones are defined and how equipment selection is matched to zone requirements.
Structure, evaluate and document a DSEAR risk assessment under Regulation 5 for gas and vapour hazards so that key decisions are clear and justifiable.
Follow the full gas and vapour explosion risk assessment process through a practical workplace example.
Available in 20+ Languages
Course subtitles are available in multiple languages, including:
This course is approved by IIRSM – the International Institute of Risk & Safety Management.
The course certificate includes:
User name
Company name
Course name
Completion date
Expiry date
Approval body
An IIRSM-approved course certificate will be available for download and printing instantly upon course completion.
Users must complete a final theory test before earning their certificate.
The end-of-course test is:
Fully online
Multiple choice
A score of 80% is required to pass.
Customer Feedback
Why DSEAR Gas and Liquid Explosion Risk Assessment Training for Duty Holders Is Important
Flammable gases and vapours released from flammable liquids can create explosive atmospheres during routine work, including storage, transfer, cleaning, maintenance and drum handling. The danger is not always obvious: a small release can become serious if it reaches the right concentration and meets an ignition source.
DSEAR requires employers to assess these risks, control them and make sure workers understand how to work safely with dangerous substances. Where explosive atmospheres may occur, duty holders also need to consider hazardous area classification, ignition controls, suitable equipment and clear records of significant findings.
The weak point is often not the presence of a risk assessment, but the quality of the decisions behind it. Duty holders need to understand whether vapour could realistically form under normal or fault conditions, whether ventilation is enough, whether ignition sources have been controlled and whether the assessment can be justified if challenged.
This IIRSM-approved DSEAR Gas and Liquid Explosion Risk Assessment Training for Duty Holders gives duty holders a structured way to approach those decisions. It explains how to identify dangerous substances, assess release and ignition scenarios, use data such as flash point, lower explosive limit (LEL) and vapour density, apply DSEAR’s hierarchy of controls and recognise when specialist input is needed.
How DSEAR Gas and Liquid Explosion Risk Assessment Training for Duty Holders Helps Your Organisation
This training helps organisations to:
Build a consistent approach to gas and vapour explosion risk assessment across teams, departments and sites
Improve the quality of recorded findings by linking substances, tasks, release points, ignition sources and controls
Support more defensible decisions on hazardous area classification, ventilation, equipment selection and ignition source control
Help duty holders recognise when an assessment can be managed in-house and when specialist support is required
Align DSEAR assessments with wider duties under health and safety, fire safety, COSHH, PUWER and chemical safety legislation
Keep training records that support internal reviews, audit preparation and regulatory checks
Reduce variation between assessors by giving duty holders a shared framework for identifying hazards, evaluating risk, applying controls, reviewing changes and recording decisions
Start DSEAR Gas and Liquid Explosion Risk Assessment Training Today
Equip duty holders to understand what a suitable and sufficient DSEAR assessment should cover, how gas and vapour hazards are identified, and how zone classification and control decisions should be documented and reviewed.
