What Is HAZID? Complete Guide to Hazard Identification Studies

A HAZID study is an important process safety activity used to identify potential hazards and credible hazardous scenarios before they develop into design, operational or safety problems.

A process plant can be designed exactly as the drawings show and still contain significant hazards. A facility may handle flammable hydrocarbons, toxic chemicals, high pressure, high temperature, reactive materials, rotating equipment and complex operating procedures. The challenge is not simply recognizing that these hazards exist. The challenge is understanding how they could lead to unwanted events and whether appropriate safeguards are available to prevent or control those scenarios.

HAZID, short for Hazard Identification Study, is a structured process used to identify potential hazards and credible hazardous scenarios associated with a facility, process, project, activity or system. A HAZID study is commonly performed during the early stages of a project, when its findings can influence design decisions. It can also be conducted during modifications, commissioning, operations and decommissioning.

A HAZID study can help a multidisciplinary project team identify significant hazards, review existing safeguards, identify areas where additional controls may be required, and determine which scenarios require further assessment through studies such as HAZOP, QRA, LOPA or functional safety analysis.

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What Is HAZID?

A Hazard Identification Study, or HAZID, is a structured multidisciplinary review used to identify potential hazards, credible accident scenarios, consequences and existing or required safeguards associated with a project, facility, process, system or activity.

The emphasis is on identifying hazards and scenarios that could have meaningful consequences and determining whether they require further assessment or risk reduction.

A HAZID is therefore more than a brainstorming session.

A useful study asks questions such as:

1. What hazards are present?
2. What could cause an unwanted event?
3. What could happen if the event occurs?
4. Who or what could be affected?
5. What safeguards already exist?
6. Are those safeguards appropriate for the scenario?
7. Does the scenario require further analysis?
8. What actions should be carried forward into engineering or operations?

The exact HAZID methodology can vary according to the organization, industry, project phase, facility complexity and objectives of the study. There is no single universal HAZID worksheet or guideword set that should be applied identically to every project.

This is an important distinction because a HAZID for an offshore facility, chemical plant, storage terminal, utility system or construction activity may need to consider very different hazard categories.

CCPS describes Hazard Identification and Risk Analysis as a core process safety activity and recognizes that different techniques and levels of analysis may be appropriate depending on the purpose, life cycle stage and complexity of the facility.

Why Is HAZID Important in Process Safety?

Consider two project teams.

The first team identifies during FEED that a hazardous inventory could potentially affect a normally occupied building. At this stage, the plot plan is still being developed.

The second team discovers the same issue after construction is substantially complete.

The underlying hazard may be the same. The engineering consequences of discovering it are not.

During an early design stage, the team may still have options involving equipment location, building separation, orientation, ventilation, drainage, access, detection and emergency response arrangements.

Later in the project, changing those decisions may involve significant redesign, cost and schedule implications.

This is one of the reasons early hazard identification is valuable.

A HAZID can help identify:

1. Major accident hazards
2. Loss of containment scenarios
3. Fire and explosion hazards
4. Toxic release scenarios
5. High pressure and high temperature hazards
6. Reactive chemical hazards
7. Utility failure scenarios
8. Equipment and mechanical hazards
9. Human and operational hazards
10. Maintenance and intervention hazards
11. SIMOPS hazards
12. External and natural hazards
13. Emergency response challenges
14. Hazards associated with temporary or abnormal conditions

The purpose is not to eliminate every conceivable hazard from a project. That would neither be realistic nor technically useful.

The purpose is to develop a structured understanding of credible hazards and their potential consequences, and to identify where risk controls or additional studies are required.

When Should a HAZID Study Be Conducted?

HAZID is often associated with early project development, but hazard identification should not be treated as a one-time activity.

The appropriate timing depends on the facility, project life cycle and objectives.

HAZID During Concept Design

At the conceptual stage, a HAZID can help identify major hazards before fundamental design decisions are fixed.

The available engineering information may be limited, so the study generally focuses on broad hazards and credible scenarios rather than detailed process deviations.

Questions may include:

1. What hazardous materials will be handled?
2. What major release scenarios are credible?
3. Are there significant fire or explosion hazards?
4. Could hazardous releases affect people outside the process area?
5. Are there major layout or siting concerns?
6. What additional studies will be needed?

HAZID During FEED

FEED usually provides more information about the process configuration, equipment, layout, utilities and operating philosophy.

The HAZID can therefore examine the developing design in greater detail.

Findings at this stage can potentially influence:

1. Equipment layout
2. Building location
3. Separation distances
4. Drainage
5. Fire protection
6. Detection systems
7. Emergency shutdown philosophy
8. Access and escape
9. Ventilation
10. Utility arrangements

HAZID During Detailed Engineering

Additional hazard reviews may be appropriate as the design becomes more defined.

This can be particularly relevant where:

1. The design has changed significantly
2. New equipment has been introduced
3. Hazardous inventories have changed
4. Interfaces between systems have become clearer
5. Earlier assumptions are no longer valid

HAZID During Construction and Commissioning

Construction and commissioning can create temporary hazardous conditions that do not exist during normal operation.

Examples include:

1. Temporary connections
2. Temporary equipment
3. Pressure testing
4. Chemical introduction
5. Energization
6. Equipment preservation and reinstatement
7. Temporary bypasses
8. Construction and commissioning occurring simultaneously

A project may therefore require additional hazard identification for these activities.

HAZID for Existing Facilities

Existing facilities may require hazard identification when undergoing:

1. Major modifications
2. Capacity expansion
3. New raw materials
4. Process changes
5. New operating conditions
6. Significant equipment replacement
7. New interfaces with adjacent facilities

Management of Change processes may also identify the need for additional hazard assessment.

HAZID During Decommissioning

Decommissioning changes the hazard profile of a facility.

Equipment that is no longer operating may still contain:

1. Residual chemicals
2. Stored pressure
3. Contaminants
4. Electrical energy
5. Mechanical energy
6. Flammable or toxic residues

Dismantling, cutting, lifting and temporary arrangements can introduce additional hazards.

For this reason, hazard identification should be considered across the facility life cycle rather than as an isolated design activity.

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What Does a HAZID Study Cover?

The scope should be tailored to the project.

A generic checklist can be useful for prompting discussion, but relying on a checklist alone can cause important project-specific hazards to be overlooked.

Typical HAZID categories include the following.

Process and Chemical Hazards

The team may consider hazards associated with:

1. Flammable substances
2. Toxic substances
3. Corrosive materials
4. Reactive chemicals
5. High pressure
6. High temperature
7. Low temperature
8. Unstable materials
9. Hazardous inventories
10. Chemical incompatibility

The nature of the process should determine which hazards receive attention.

Loss of Containment

Loss of containment is a fundamental concern in many process industries.

Potential causes can include:

1. Pipe failure
2. Valve failure
3. Flange leakage
4. Equipment failure
5. Corrosion
6. Erosion
7. Mechanical damage
8. Overpressure
9. Human error during maintenance
10. Incorrect connection or isolation

The resulting consequence may depend on the material, release rate, operating conditions, ignition sources, location and available safeguards.

Fire and Explosion

Where flammable materials are present, HAZID may consider scenarios such as:

1. Pool fires
2. Jet fires
3. Flash fires
4. Vapour cloud explosions
5. Boiling liquid expansion events where applicable
6. Secondary escalation to nearby equipment

The HAZID may identify the need for more detailed fire, explosion or consequence assessment rather than attempting to perform all such analyses during the workshop itself.

Toxic Releases

Toxic releases may result from equipment failure, piping failure, accidental mixing, process upsets or other credible initiating events.

The team may consider:

1. Source of the release
2. Potential affected areas
3. Occupied buildings
4. Detection
5. Isolation
6. Ventilation
7. Emergency response
8. Potential requirement for dispersion modelling

Where necessary, detailed toxic dispersion analysis can subsequently be performed.

Utility Failure

Utilities can be safety critical even though they may not directly form part of the process.

The HAZID may consider loss of:

1. Electrical power
2. Instrument air
3. Cooling water
4. Heating medium
5. Nitrogen
6. Ventilation
7. Firewater
8. Communication
9. Control systems

The important question is not simply whether a utility can fail.

It is:

What happens to the process when it fails?

A loss of cooling, for example, could be insignificant in one process and highly consequential in another.

Human and Operational Hazards

A technically sound design can still present significant risk if operating and maintenance activities are not considered.

HAZID may examine:

1. Startup
2. Shutdown
3. Normal operation
4. Manual intervention
5. Sampling
6. Draining
7. Venting
8. Isolation
9. Maintenance
10. Permit to work activities
11. Line breaking
12. Loading and unloading
13. Access
14. Emergency actions

Human factors should therefore be considered as part of the overall hazard picture rather than added as an afterthought.

SIMOPS

SIMOPS means simultaneous operations.

Different activities taking place at the same time can interact in ways that create hazards.

For example, construction work may occur near a live process area while maintenance activities are taking place.

Potential interactions may involve:

1. Hot work
2. Lifting
3. Hydrocarbon handling
4. Vehicle movement
5. Electrical work
6. Commissioning
7. Process operations

The HAZID can identify these interfaces and determine whether additional controls or dedicated assessments are necessary.

External and Natural Hazards

Depending on location and facility type, the assessment may consider:

1. Earthquake
2. Flood
3. Lightning
4. High winds
5. Extreme temperatures
6. Nearby industrial incidents
7. Transportation incidents
8. External fires
9. Other site-specific natural or external events

The assessment should be based on the actual site and project context rather than automatically applying every possible external hazard.

How Is a HAZID Study Conducted?

 

Although the exact procedure varies, a well-planned HAZID commonly follows a structured sequence.

1. Define the Study Objectives

The team first establishes what the HAZID is intended to achieve.

This may include:

1. Identifying major hazards
2. Reviewing a new process concept
3. Supporting FEED
4. Reviewing a plant modification
5. Identifying scenarios requiring QRA
6. Reviewing facility siting
7. Assessing commissioning activities
8. Identifying requirements for further studies

Without a clear objective, the study can become a long list of unrelated observations.

2. Define the Scope and Boundaries

The team should establish what is included and excluded.

For example:

1. Process units
2. Storage areas
3. Loading facilities
4. Utilities
5. Offsites
6. Control rooms
7. Laboratories
8. Warehouses
9. Transportation interfaces
10. Construction areas

Scope boundaries should be documented so that gaps can be identified.

3. Collect Available Information

Depending on the project stage, information may include:

1. Process descriptions
2. Block flow diagrams
3. Process flow diagrams
4. Plot plans
5. Equipment layouts
6. Material inventories
7. Safety Data Sheets
8. Preliminary equipment specifications
9. Utility information
10. Operating philosophy
11. Emergency response philosophy
12. Site information
13. Meteorological information
14. Previous incident information

A HAZID should recognize information limitations rather than presenting uncertain assumptions as established facts.

4. Select an Appropriate HAZID Method

The study team determines the approach used to identify hazards.

Methods may involve combinations of:

1. Structured brainstorming
2. Hazard categories
3. Checklists
4. Previous incident experience
5. Scenario-based questioning
6. Engineering judgement
7. Review of similar facilities
8. Site-specific information

The method should be proportionate to the complexity and maturity of the project.

5. Conduct the Multidisciplinary Workshop

The workshop brings together people from different technical and operational disciplines.

The facilitator guides the team through the defined scope and ensures that hazards are considered systematically.

A useful discussion typically moves beyond:

“There is a fire hazard.”

and asks:

What could release the material?

Under what conditions?

What could ignite it?

Who or what could be affected?

What safeguards are already provided?

What happens if a safeguard fails?

Does the scenario require further analysis?

That progression turns a generic hazard statement into a useful engineering scenario.

6. Identify Causes and Consequences

For each significant scenario, the team considers credible initiating causes and potential consequences.

For example:

Hazard: Flammable liquid release

Potential causes:
Piping failure, flange leakage, equipment failure or maintenance error

Potential consequence:
Formation of a flammable vapour cloud followed by ignition

Potential impacts:
Personnel exposure, equipment damage and possible escalation

Existing safeguards:
Detection, isolation, fire protection and inspection controls

Further action:
Additional engineering review or consequence assessment, if required

The level of detail should remain appropriate to the HAZID. A HAZID should not automatically become a full consequence modelling exercise.

7. Review Existing Safeguards

The team considers what controls are already available.

Safeguards may include:

1. Equipment design
2. Process control
3. Alarms
4. Detection
5. Isolation
6. Relief systems
7. Emergency shutdown
8. Fire protection
9. Physical separation
10. Ventilation
11. Procedures
12. Inspection and maintenance

The existence of a safeguard does not automatically mean that the risk is adequately controlled.

Its relevance, independence, reliability and suitability for the scenario may need further evaluation.

8. Identify Recommendations

Where the existing design does not adequately address an identified scenario, the team can recommend further action.

Recommendations may involve:

1. Design modification
2. Additional detection
3. Improved isolation
4. Layout changes
5. Fire protection
6. Drainage
7. Ventilation
8. Instrumentation
9. Procedural controls
10. Inspection requirements
11. Additional analysis

Where practical, the team should consider whether the hazard can be reduced through design rather than relying exclusively on administrative controls.

9. Document and Track Actions

A HAZID should result in more than workshop notes.

Recommendations should be documented, assigned and tracked.

A typical action record may contain:

Field	Example
Hazard / Scenario	Loss of containment from process piping
Cause	Piping failure
Consequence	Flammable release and potential fire
Existing Safeguard	Detection and isolation
Recommendation	Review detection and isolation coverage
Responsible Person	Assigned project discipline
Target Date	Defined by project
Status	Open / Closed

The exact format varies between organizations.

The important principle is that findings should remain visible until the responsible team has evaluated and closed them.

Who Should Participate in a HAZID Workshop?

HAZID is fundamentally multidisciplinary.

The appropriate team depends on the project, but may include:

1. Process engineers
2. Process safety engineers
3. Operations personnel
4. Mechanical engineers
5. Instrumentation and control engineers
6. Electrical engineers
7. HSE professionals
8. Fire protection specialists
9. Maintenance representatives
10. Project engineers
11. Layout or facility engineers
12. Other relevant subject matter experts

Operations participation can be particularly valuable.

An engineer reviewing a PFD may see a process connection.

An experienced operator may immediately recognize that the connection is routinely isolated, drained, sampled or manually manipulated.

Those practical details can materially change the hazard discussion.

The objective is therefore not to assemble the largest possible team.

It is to assemble a team with the right combination of technical, operational and facility knowledge for the study scope.

What Information Is Needed Before a HAZID?

The information required depends on the project phase.

For an early conceptual HAZID, the available information may include only:

1. Process concept
2. Major equipment
3. Hazardous materials
4. Preliminary layout
5. Major operating conditions
6. Basic site information

For a more developed project, the team may have access to:

1. PFDs
2. P&IDs
3. Plot plans
4. Equipment specifications
5. Material inventories
6. Operating philosophy
7. Control philosophy
8. Fire protection philosophy
9. Emergency response information
10. Utility information

The important principle is simple:

The HAZID should reflect the maturity of the design information available at the time of the study.

It is inappropriate to create false precision where the design is still conceptual.

Practical HAZID Example: What Happens During a Workshop?

Consider a storage facility handling a flammable liquid.

The HAZID team identifies a potential loss of containment from a storage tank transfer line.

The discussion could develop as follows.

Hazard

Flammable liquid release.

Possible causes

1. Transfer piping failure
2. Flange leakage
3. Valve failure
4. Mechanical damage
5. Incorrect maintenance activity

Potential consequences

If the released liquid forms a vapour cloud and encounters an ignition source, possible consequences could include:

1. Flash fire
2. Pool fire
3. Equipment damage
4. Personnel exposure
5. Escalation to adjacent equipment

Existing safeguards

The team may identify controls such as:

1. Isolation valves
2. Leak detection
3. Fire protection
4. Inspection and maintenance
5. Bunding or containment
6. Emergency procedures

HAZID recommendation

Depending on the actual facility and scenario, the team may recommend reviewing:

1. Isolation arrangements
2. Detection coverage
3. Drainage and containment
4. Ignition source control
5. Fire protection
6. Separation from occupied areas
7. Need for consequence modelling

Notice what the HAZID has achieved.

It has not attempted to calculate every possible consequence during the workshop.

Instead, it has established a credible scenario, considered the controls and identified where additional engineering attention may be required.

That is an important distinction between hazard identification and detailed quantitative analysis.

What Are the Outputs of a HAZID Study?

The exact deliverables depend on the project, but commonly include:

HAZID Report

The report normally records:

1. Study objectives
2. Scope and boundaries
3. Methodology
4. Participants
5. Reference documents
6. Assumptions
7. Identified hazards
8. Scenarios
9. Consequences
10. Existing safeguards
11. Recommendations
12. Risk evaluation, where applicable
13. Action tracking

Hazard Register

The hazard register provides a structured record of identified hazards and relevant information.

Action Register

Recommendations requiring further work should be tracked to closure.

Inputs to Further Studies

One of the most valuable HAZID outputs may be the identification of issues requiring more detailed assessment.

Depending on the project, these may include:

1. HAZOP
2. QRA
3. Consequence analysis
4. Dispersion modelling
5. Fire and explosion assessment
6. LOPA
7. SIL assessment
8. Facility siting assessment
9. Emergency response assessment
10. Hazardous area classification

HAZID vs HAZOP

HAZID and HAZOP are often mentioned together, but they answer different questions.

HAZID

HAZID generally asks:

What significant hazards and credible scenarios exist within this project, facility, system or activity?

HAZOP

HAZOP asks:

What deviations from the design intent could occur, what could cause them, what consequences could result, and what safeguards exist?

HAZOP uses a structured guideword-based methodology. IEC 61882 provides guidance for the application of HAZOP studies, including preparation, examination sessions, documentation and follow-up.

Aspect	HAZID	HAZOP
Primary focus	Broad hazard identification	Detailed deviation analysis
Typical scope	Facility, project, system or activity	Process systems or defined nodes
Method	Structured hazard identification	Guideword-based examination
Typical timing	Often early project stages, but can be used throughout the life cycle	Usually when sufficient process design information is available
Main question	What could be hazardous?	What could deviate from design intent?
Level of detail	Broad to intermediate	More detailed
Relationship	Can identify areas requiring further study	Can provide detailed analysis of defined process systems

They are complementary rather than competing techniques.

A HAZID may identify a broad hazard that requires detailed HAZOP examination later.

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HAZID vs HIRA

The terminology can become confusing because different organizations use these terms differently.

HIRA commonly refers to Hazard Identification and Risk Analysis and can be used as a broader term covering activities used to identify hazards and analyze risk.

HAZID is a specific structured hazard identification approach.

Therefore, HAZID can form part of a broader HIRA framework.

The terminology used by a project should be explicitly defined so that everyone understands:

1. What methodology is being used
2. What is included in the study
3. What risk evaluation is performed
4. What outputs are expected

The name of the study is less important than the actual scope and methodology applied.

HAZID vs QRA

HAZID and QRA should not be treated as interchangeable.

A HAZID primarily identifies hazards and credible scenarios and determines where further risk analysis may be required.

A Quantitative Risk Assessment, or QRA, uses quantitative methods to estimate risk using defined inputs such as initiating event frequencies, consequence modelling and other relevant parameters.

For example, a HAZID may identify:

Potential toxic release from process equipment.

The project may then determine that the scenario requires:

1. Source term estimation
2. Atmospheric dispersion modelling
3. Exposure assessment
4. Frequency estimation
5. Individual and/or societal risk assessment

Those activities would generally belong to a more detailed consequence or QRA process rather than the basic HAZID workshop.

How Does HAZID Relate to LOPA and SIL?

HAZID, HAZOP, LOPA and SIL assessment can contribute to different parts of the process safety assessment framework.

A simplified relationship may look like:

HAZID
Broad hazard and scenario identification

↓

HAZOP
Detailed examination of process deviations

↓

LOPA
Semi quantitative evaluation of selected scenarios and protection layers

↓

SIL Assessment
Determination of required Safety Integrity Level for applicable safety instrumented functions

However, this should not be interpreted as a mandatory sequence for every project.

A project may use some techniques without using all of them, and the appropriate methodology depends on the hazards, design stage, applicable requirements and objectives.

For example, not every HAZID finding automatically requires LOPA, and not every HAZOP deviation requires a SIL assessment.

The analysis should be proportionate to the scenario and the decision that needs to be made.

Need to determine whether identified scenarios require LOPA or SIL assessment?

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What Makes a HAZID Study Effective?

A HAZID can be completed according to a documented procedure and still provide limited value if the underlying study process is weak.

Several factors make a difference.

The Right Participants

A multidisciplinary team brings different perspectives to the same scenario.

The Right Information

The team needs enough information to make meaningful decisions while recognizing what remains uncertain.

Good Facilitation

The facilitator should keep the discussion systematic, encourage participation and prevent the workshop from becoming dominated by a single discipline.

Scenario Quality

“Fire” or “toxic release” is not always enough.

The team should understand the credible scenario sufficiently to determine its relevance and required safeguards.

Appropriate Risk Evaluation

Where risk ranking is used, the criteria should be defined and applied consistently.

Practical Recommendations

Recommendations should be specific enough to be acted upon.

“Improve safety” is not a useful action.

“Review isolation coverage for the identified release scenario” is much more actionable.

Action Closeout

An open recommendation that disappears into a report is not effective risk management.

The action needs an owner, a decision and documented closure.

Common HAZID Mistakes

Some of the most important weaknesses in HAZID studies are not caused by the absence of a checklist.

They arise from how the study is conducted.

Treating HAZID as a Compliance Exercise

If the objective becomes simply completing the worksheet, the discussion can lose its engineering value.

Using the Same Checklist for Every Facility

A refinery, pharmaceutical plant, gas terminal and manufacturing facility do not have identical hazard profiles.

Checklists should support engineering judgement, not replace it.

Ignoring Human and Maintenance Activities

Normal operation is only part of the facility life cycle.

Maintenance, isolation, startup, shutdown and intervention can introduce significant hazards.

Focusing Only on Process Equipment

Facility layout, occupied buildings, access, utilities, external events and interfaces can be equally important.

Recording Hazards Without Scenarios

A register containing only “fire,” “explosion” and “toxic release” provides limited insight.

The team needs enough scenario definition to understand what can actually happen.

Ignoring Uncertainty

Early design information is often incomplete.

The study should document important assumptions and identify where further information or analysis is required.

Failing to Close Actions

This is one of the most important practical weaknesses.

The value of a HAZID is ultimately reflected in how its findings influence engineering and operational decisions.

Does HAZID Identify Risk?

This requires some clarification.

A HAZID identifies hazards and scenarios and may include risk evaluation depending on the methodology used.

However, HAZID should not automatically be assumed to provide a complete quantitative assessment of facility risk.

The depth of risk evaluation should be defined by the study objectives.

A qualitative or semi quantitative screening may be sufficient for some purposes.

Other scenarios may require detailed QRA, consequence modelling, LOPA or another specialized assessment.

This distinction prevents HAZID from being asked to answer questions it was never designed to answer.

Can HAZID Identify SIL Requirements?

Not directly in every case.

HAZID may identify hazardous scenarios and highlight the need for additional safeguards.

If a scenario involves a safety instrumented function, further analysis may be required to determine whether a SIF is necessary and, where applicable, what SIL is required.

Depending on the methodology and project requirements, this may involve HAZOP, LOPA and subsequent SIL assessment or verification.

Therefore:

HAZID can identify scenarios that may eventually lead to functional safety assessment, but it should not automatically be treated as a SIL determination method.

How Detailed Should a HAZID Be?

The answer depends on the project stage and study objective.

A conceptual HAZID may appropriately remain broad.

A HAZID performed on a mature design may consider more specific equipment, interfaces and scenarios.

The principle is:

The depth of the HAZID should be appropriate to the decisions the study is intended to support.

Too little detail can miss important scenarios.

Too much detail can duplicate later studies and make the HAZID unnecessarily difficult to manage.

A good study finds the appropriate level.

Is HAZID Required by Law or a Specific Standard?

There is no universal rule that every industrial project in every jurisdiction must conduct a study called “HAZID” using one prescribed methodology.

Whether a HAZID or another hazard identification study is required can depend on:

1. Applicable legislation
2. Regulatory requirements
3. Industry requirements
4. Client specifications
5. Project standards
6. Company process safety procedures
7. Facility hazard profile
8. Insurer or stakeholder requirements

This is why a technical assessment should identify the applicable requirements rather than claiming that HAZID is universally mandatory.

HAZID should also not be confused with HAZOP requirements where specific standards or project requirements apply.

HAZID in a Broader Process Safety Framework

HAZID works best when it is connected to the wider process safety management system.

A simplified view is:

Identify hazards

↓

Understand credible scenarios

↓

Evaluate risk where required

↓

Select appropriate safeguards

↓

Verify the design

↓

Manage changes

↓

Maintain the safeguards

↓

Monitor and improve

A HAZID therefore represents one part of a larger risk management process.

The ultimate objective is not the HAZID report itself.

The objective is to make better engineering and operational decisions based on a structured understanding of hazards.

How INDSAFE Approaches HAZID Studies

At INDSAFE, HAZID studies can be tailored to the project phase, facility type, process complexity and objectives of the assessment.

The study scope can consider relevant process, facility, operational and external hazards and can be structured around the information available at the time of assessment.

Depending on project requirements, the assessment may consider:

1. Process and chemical hazards
2. Loss of containment
3. Fire and explosion scenarios
4. Toxic release scenarios
5. Utility failures
6. Human and operational factors
7. SIMOPS
8. Facility and layout considerations
9. External and natural hazards
10. Existing safeguards
11. Risk reduction opportunities
12. Recommendations for further studies

Where the HAZID identifies scenarios requiring more detailed assessment, the findings can provide inputs to subsequent studies such as HAZOP, QRA, consequence analysis, LOPA, SIL assessment and other process safety evaluations.

The methodology, study scope, participants and deliverables should be defined according to the specific project rather than applying an identical template to every facility.

Planning a HAZID for your facility or project?

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Frequently Asked Questions About HAZID

What does HAZID stand for?

HAZID generally stands for Hazard Identification or Hazard Identification Study. The terminology can vary between organizations and projects.

What is the main purpose of HAZID?

The main purpose of HAZID is to systematically identify potential hazards and credible hazardous scenarios, consider their consequences and safeguards, and determine whether additional controls or further analysis are required.

When should a HAZID study be conducted?

HAZID is often conducted during conceptual design and FEED, but it can also be performed during detailed engineering, construction, commissioning, operation, modification and decommissioning when appropriate.

Who participates in a HAZID workshop?

HAZID workshops are typically multidisciplinary. Participants may include process, process safety, operations, mechanical, instrumentation, electrical, HSE, maintenance, fire protection and project personnel, depending on the study scope.

What is the difference between HAZID and HAZOP?

HAZID is generally broader and focuses on identifying hazards and credible scenarios. HAZOP uses guide words to systematically examine deviations from design intent within defined process systems.

Is HAZID the same as HIRA?

No. HIRA is commonly used as a broader term for Hazard Identification and Risk Analysis activities. HAZID is one structured approach to hazard identification.

Is HAZID the same as QRA?

No. HAZID primarily identifies hazards and scenarios. QRA uses quantitative methods to estimate risk using defined frequency, consequence and other relevant inputs.

Does HAZID replace HAZOP?

No. HAZID and HAZOP serve different purposes and can complement one another.

Does HAZID replace QRA?

No. A HAZID may identify scenarios that require detailed QRA, but it does not replace a QRA where quantitative risk analysis is required.

Can HAZID determine SIL?

HAZID can identify scenarios that may require functional safety assessment, but SIL determination normally requires an appropriate functional safety methodology such as LOPA or another recognized assessment approach.

What are the outputs of HAZID?

Typical outputs include a HAZID report, hazard register, identified scenarios, safeguard information, recommendations and an action register. Additional study recommendations may also be included.

How long does a HAZID study take?

There is no universal duration. The time required depends on the size and complexity of the facility, study scope, available information, number of systems or areas being reviewed and composition of the workshop team.

Can HAZID be conducted for an existing plant?

Yes. HAZID can be applied to existing facilities, particularly during major modifications, expansions, process changes, operational changes or other situations where a structured hazard review is appropriate.

Conclusion

HAZID is fundamentally about asking the right questions early enough for the answers to influence decisions.

What can go wrong?

What could cause it?

What could happen next?

Who or what could be affected?

What safeguards already exist?

And where is further action necessary?

The value of a HAZID does not come from producing the longest hazard register. It comes from developing a structured understanding of credible scenarios and ensuring that important findings are carried forward into design, detailed analysis and operations.

HAZID is also not a replacement for HAZOP, QRA, LOPA, SIL assessment or other specialized process safety studies. Each technique addresses different questions and levels of analysis.

Used appropriately, HAZID can provide an important early layer of hazard understanding and help project teams make informed decisions before design choices become difficult to change.

For complex industrial projects, effective hazard identification is not simply about finding hazards.

It is about understanding them well enough to make better decisions about prevention, protection and risk reduction.

Technical References

Center for Chemical Process Safety, AIChE
Introduction to Hazard Identification and Risk Analysis.

Center for Chemical Process Safety, AIChE
Guidelines for Hazard Evaluation Procedures.

Center for Chemical Process Safety, AIChE
Guidelines for Risk Based Process Safety.

International Electrotechnical Commission
IEC 61882:2016, Hazard and operability studies, HAZOP studies, Application guide.

Important technical note: IEC 61882 is specifically guidance for HAZOP studies. It should not be presented as a universal HAZID standard.