HAZOP, HAZID and LOPA Consultancy: Hazard Identification and Risk Assessment
HAZOP Consultant | LOPA Consultant
What hazard identification and risk assessment involves?
Hazard Identification and Risk Assessment in process safety refers to the structured evaluation of potential major accident hazards, their causes and consequences, and the effectiveness of safeguards in reducing risk to tolerable and ALARP levels. Techniques such as Hazard Identification (HAZID), Hazard and Operability Studies (HAZOP) and Layers of Protection Analysis (LOPA) are widely used to systematically identify risks and define appropriate prevention and mitigation measures.
These studies provide the technical foundation for safe design, regulatory compliance and operational assurance.
Why hazard studies matter for major accident risk?
For organisations operating in chemicals, distilled spirits, food and drink, life sciences, biotechnology, renewables and energy, major accident hazards can arise from flammable liquids, gases, reactive chemicals, pressurised systems or complex process interactions.
Structured hazard studies:
- Identify credible major accident scenarios
- Define appropriate layers of protection
- Support demonstration of ALARP
- Inform functional safety requirements
- Provide inputs to COMAH and DSEAR compliance
- Reduce the likelihood of late design changes
When carried out at the right time and to the right depth, these studies influence safer, more cost-effective decisions.
Hazard studies should not be treated as one-off exercises. They form part of a continuous process safety lifecycle.
Concept and Early Design
- HAZID and early hazard identification
- Inherent safety considerations
- Identification of major accident hazards
- Input to site layout and process selection
Construction and Commissioning
- Hazard study close-out verification
- Pre-start-up safety reviews
- Confirmation of implemented safeguards
Operation and Maintenance
- HAZOP revalidation
- LOPA review where risk profile changes
- Action tracking and closure
Modification and Change
- Targeted HAZID or HAZOP
- Reassessment of protection layers
- Verification of residual risk
This lifecycle approach ensures risks remain visible, understood and controlled.
What Is a HAZID?
A HAZID is a high-level, structured hazard identification workshop used to identify major accident hazards and risk drivers at an early stage of a project or modification.
When Is HAZID Used?
- Feasibility and concept selection
- Early project development
- Significant change to operations
- Introduction of new hazardous materials
What Does a HAZID Deliver?
- Identification of major accident hazards
- High-level consequence considerations
- Early definition of safeguards
- Inputs to design and regulatory strategy
HAZID provides early clarity before design decisions become fixed.
What Is a HAZOP?
A HAZOP is a systematic, guideword-based review of deviations from design intent in process systems. It examines how equipment, instrumentation and control systems may fail or be misused, and evaluates the consequences and safeguards associated with those deviations.
HAZOP studies are typically carried out in line with recognised industry standards and best practice.
When Is HAZOP Used?
- During detailed design
- Before construction or commissioning
- For major plant modifications
- As periodic revalidation for existing facilities
What Does a HAZOP Deliver?
- Identification of credible deviation scenarios
- Assessment of existing safeguards
- Risk ranking and action definition
- Inputs to LOPA and functional safety
- Action tracking for implementation
HAZOP provides the detailed understanding required to manage process risk effectively.
What Is LOPA?
LOPA is a semi-quantitative method used to evaluate whether existing independent protection layers are sufficient to reduce risk to tolerable or ALARP levels. It builds on HAZOP findings and assesses the reliability and independence of safeguards.
When Is LOPA Used?
- When risk ranking from HAZOP indicates higher severity
- To justify safety instrumented functions
- To determine required risk reduction factors
- To support ALARP demonstration
What Does LOPA Deliver?
- Quantified risk reduction requirements
- Identification of safety instrumented functions
- Input to SIL determination
- Clear documentation supporting compliance
LOPA bridges qualitative hazard identification and quantitative risk assessment.
An Integrated, Multidisciplinary Approach
Hazard identification and risk assessment are most effective when integrated with mechanical, piping, electrical, control and operational expertise.
IDEA combines process safety knowledge with multidisciplinary engineering capability to ensure that identified safeguards are technically feasible, operationally practical and aligned with regulatory expectations.
Our approach:
Depending on scope, deliverables may include:
- HAZID, HAZOP or LOPA reports
- Risk matrices and action registers
- Identification of safety instrumented functions
- Inputs to Safety Requirement Specifications
- ALARP demonstration support
- Revalidation documentation
- Evidence supporting COMAH and DSEAR submissions
Outputs are structured to be clear, auditable and aligned with industry standards.
IDEA has extensive experience supporting clients with hazard identification and risk assessment across complex and highly regulated environments. Our work spans new build projects, brownfield modifications, capacity expansions, energy transition initiatives and ageing plant reviews.
We routinely support:
- Upper tier and lower tier COMAH establishments
- Distilleries managing flammable liquids and vapours
- Chemical and fine chemical facilities handling reactive or toxic materials
- Food and drink manufacturing with dust and combustible atmospheres
- Life sciences and biotechnology operations involving solvents, gases and pressure systems
- Energy transition projects including hydrogen and alternative fuels
Our involvement ranges from early HAZID during concept development through to detailed HAZOP, LOPA and SIL input during design, commissioning and revalidation phases.
In many cases, we provide integrated support where hazard studies interface with:
- Functional safety assessment and Safety Instrumented System design
- DSEAR and hazardous area classification
- ALARP demonstration for regulatory submissions
- COMAH safety report preparation and review
- Asset integrity and ageing plant assessment
Our experience enables us to align study depth and methodology with project stage, regulatory expectations and operational constraints. The outcome is structured, defensible hazard assessment that translates into practical, implementable risk reduction.
Frequently Asked Questions
Quick answers to questions you may have about our services
HAZID is a high-level hazard identification study carried out early in a project to identify major accident hazards and influence concept and design decisions.
HAZOP is a detailed, systematic review of deviations from design intent conducted once the design is defined, to assess causes, consequences and the adequacy of safeguards.
HAZOP revalidation should be scheduled according to the facility’s risk profile, operating history and management-of-change arrangements. For some higher-hazard sites, it may align with the five-year COMAH safety report review cycle. Significant modifications, changes in operation or incidents may require an earlier review.
No. LOPA is generally applied to higher risk scenarios where additional clarity is required to demonstrate that safeguards provide sufficient risk reduction. It is not necessary for low consequence or adequately controlled scenarios.
Effective hazard studies require multidisciplinary participation. This typically includes process engineers, operations representatives, maintenance personnel, control and instrumentation engineers and process safety specialists. The quality of discussion is directly influenced by the breadth of experience in the room.
The duration depends on plant complexity, scope and preparation quality. A well-prepared study with clearly defined nodes and up-to-date documentation significantly improves efficiency and study quality.
The cost of a HAZID or HAZOP workshop depends on several factors, including:
- Size and complexity of the plant or process
- Number of nodes or systems to be reviewed
- Quality and completeness of input documentation (P&IDs, process data)
- Number of participants and workshop duration
- Level of preparation and follow-up required
As a guide:
- HAZID studies are typically lower cost, as they are shorter and carried out at an earlier stage
- HAZOP studies require more time and preparation, particularly for complex or high-hazard facilities
A well-prepared HAZOP with clear documentation can significantly reduce workshop duration and overall cost.
For this reason, cost is best considered alongside quality of preparation and clarity of scope, as these have a direct impact on both efficiency and outcomes.
Talk to our process safety experts to discuss costs for HAZID and HAZOP Studies.
CONTACT US
Talk to our process safety team about a HAZOP, HAZID or LOPA study
If you are planning a new project, modifying existing plant or reviewing the robustness of your current hazard studies, our Process Safety team can provide clear and proportionate advice tailored to your stage in the lifecycle.
We support CAPEX teams, operations, SHQ and senior leadership across Scotland, the UK and Europe in delivering structured HAZID, HAZOP and LOPA studies that translate into practical risk reduction.