What this is
What is a hazard identification study?
What is a hazard identification study?
A structured, team-based search for hazards across a defined area, process or installation, run before the detailed risk assessment rather than instead of it. It is deliberately broad and shallow: complete coverage of what could hurt someone, with enough banding to decide what needs full assessment.
How does a HAZID differ from a HAZOP?
A HAZID sweeps an area or system for hazards of any kind — chemical, mechanical, structural, environmental — using a checklist of categories. A HAZOP walks a process line by line applying guide words to deviations from design intent. HAZID is earlier, broader and cheaper; substituting one for the other is an expensive error.
When in a project should it be run?
Early enough that the answers can still change the design, which means concept or basic design stage, before equipment is ordered. A study run after commissioning can only produce administrative controls, because everything above them in the hierarchy is set in concrete.
Scope
When is a hazard identification study required?
This study sits at the top of the risk process and hands work downward. It is not the assessment; it decides what gets assessed. Keeping that boundary sharp stops it becoming a shallow risk assessment of everything at once.
Use this template when
- A new process, line or installation is being designed, and the design can still be changed
- An existing area is due its periodic sweep and the register entries have gone stale
- A material change to plant, occupancy or throughput has altered what is present in an area
- A new hazard class enters a site — a refrigeration expansion, a confined space, new stored chemistry
- An incident elsewhere in the group suggests a hazard class you may hold and never listed
Do not use it for
- Job Safety Analysis, which breaks a single job into steps and sets controls per step, working on tasks rather than areas
- Task Risk Assessment, which is the fuller assessment this study decides to trigger, not a parallel activity
- Pre-Task Risk Assessment, which is the crew’s check of what has changed today, minutes before work starts
- Bowtie Analysis, which maps threats, barriers and consequences for one named fatal risk and is where a Yes goes next
- What If Study, which explores deviation scenarios rather than enumerating hazards, and is a different technique
Compliance mapping
Which ISO 45001 cl.6.1.2 requirements does this satisfy?
ISO 45001 cl.6.1.2 carries the primary duty, but the clause this study most often fails is 6.1.4 — planning the actions it generates. The map below ties each obligation to the section that discharges it.
| Clause | Requirement | Where it lands |
|---|---|---|
| ISO 45001 cl.6.1.2.1 | Hazard identification accounts for routine and non-routine activities, infrastructure, materials and past incidents | Hazards identified |
| ISO 45001 cl.6.1.2.2 | A defined methodology and criteria are applied to assess identified risks, proportionate to the risk | Result |
| ISO 45001 cl.6.1.4 | Actions to address risks are planned and integrated into the management system processes | Result |
| ISO 45001 cl.8.1.3 | Changes to processes, equipment and the workforce are reviewed for OH&S consequences before implementation | Header |
| ISO 45001 cl.5.4 | Workers with knowledge of the work take part in hazard identification and risk assessment | Header |
| ISO 45001 cl.7.5.3 | Documented information of the results is retained, controlled and retrievable | Result |
What it does not cover
- A study with a one-line Scope Of Study, which cannot show what was excluded, so no later study knows what to pick up and no auditor can test coverage.
- A team list naming only safety and engineering, which gives a design view of the plant and misses hazards that appear only during cleaning, changeover and breakdown.
- A Hazards Identified count that does not match the repeating entries, which shows the summary was typed rather than derived, making the result section unverifiable.
- Potential Fatal Risk marked Yes with Bowtie ID empty, which records a fatal exposure and abandons it outside the critical control process it was meant to enter.
- Added To Risk Register set to Yes with no register references on the hazards, which asserts a transfer nobody can trace and leaves the register unchanged.
Global
Hazard Identification Study requirements by country
Whether this study is a legal artefact or an internal one depends almost entirely on inventory. A cold store holding several tonnes of anhydrous ammonia sits inside a formal process-safety regime; the same building on glycol does not.
29 CFR 1910.119(e) — process hazard analysis; 40 CFR Part 68 subpart C
Prescriptive and enforceable. Above the threshold quantity — 10,000 lb for anhydrous ammonia — a process hazard analysis using a recognised methodology is mandatory, must address previous incidents and human factors, and must be revalidated every five years.
A HAZID is a legitimate methodology for simpler processes, but the content requirements are specific. On a covered site the study must be scoped to satisfy 1910.119(e) explicitly, and Next Study Due is a compliance date.
Directive 2012/18/EU (Seveso III), Art. 8 and Art. 10; Directive 89/391/EEC Art. 9
Tiered by inventory. Lower-tier establishments need a major accident prevention policy; upper-tier need a safety report showing that major accident hazards have been identified and the necessary measures taken.
The ammonia and major environmental release categories are the ones determining tier status. The study is often the first document establishing that a site is in scope, so inventory assumptions must be recorded rather than assumed.
COMAH Regulations 2015 reg. 5 and reg. 7; Management of Health and Safety at Work Regulations 1999 reg. 3
Reg. 3 imposes a general duty of suitable and sufficient assessment on every employer, with COMAH layering major accident duties on top above threshold.
Well below COMAH thresholds the reg. 3 duty still bites, and suitability is judged on whether identification was proportionate and competent. A declared scope and a named team evidence that best.
How to complete it
How to complete a hazard identification study, step by step
Four judgement calls decide whether the study survives an auditor or an investigation. None concern how to run the workshop.
Scope Of Study asks for exclusions explicitly, and that is not politeness. Every exclusion is a handover: contractor activity, the adjacent tank farm, the roof, the drainage system. If the excluded item is not named and assigned to another study, it belongs to nobody. The commonest serious gap after an incident is one the team excluded and never passed on.
Team Members asks for operations, maintenance, engineering and safety at minimum, and the weakest is usually maintenance. Confined space entries, ammonia line breaks and height work on plant exist during maintenance and are invisible in normal operation. A team without those people studies the plant running well.
Potential Fatal Risk is a routing decision, not a severity rating. Yes should mean the hazard can kill under a credible scenario, and should divert the entry into the bowtie and critical control process rather than the ranked register. The failure mode is generosity, which dilutes the set.
If every hazard is marked Yes, the study has done no screening and produced a backlog nobody will clear. If almost none are, it has closed hazards on a two-minute band. Reconcile at the end: Requiring Full Assessment must equal the count of Yes entries.
What auditors find
Most common hazard identification study findings
These findings recur when studies are audited a year on, rather than reviewed on the day they were signed.
| Finding | Clause | What fixes it |
|---|---|---|
| Added To Risk Register says Yes but the register has no entries dated near the study | ISO 45001 cl.6.1.4 | Stop treating the flag as the transfer. Require a Risk ID on every hazard banded Medium or above before closure, and reconcile the register monthly against completed studies. |
| Next Study Due is blank or has passed on most closed studies | ISO 45001 cl.6.1.2.1 | Identification has to be ongoing, so a study with no next date is a one-off. Populate Next Study Due at closure from the trigger type, and schedule from the field, not from memory. |
| Existing Controls Known is answered Yes where no control document exists | ISO 45001 cl.8.1.2 | The team is recording belief, not evidence. Require the control reference alongside the answer and treat Partly as the honest default. A control nobody can point to is an assumption inherited downstream. |
| Potential Fatal Risk is Yes on entries with no Bowtie ID months later | ISO 45001 cl.6.1.2.2 | Make Bowtie ID mandatory before closure, or route the entry as an open action with an owner. A fatal risk identified and parked converts ignorance into documented knowledge, with no control added. |
| Team Members lists the same four names on every study across the site | ISO 45001 cl.5.4 | Consistency of facilitation is good; consistency of participants is not. Rotate area operators and the relevant maintenance trades, and record roles as well as names. |
| Hazard Category entries cluster in one or two categories across every study | ISO 45001 cl.6.1.2.1 | The checklist is being used as a menu rather than a prompt list. Require an explicit not-applicable against each unused category, so an absent hazard class is a considered finding. |
Case in point
Case in point: the study that excluded the roof
A dairy site ran a hazard identification study ahead of a refrigeration upgrade. Scope was written as "ammonia plant, plant room and associated pipework", and in the room the team agreed verbally that the roof-mounted condensers sat with the contractor’s own assessment. That agreement never reached Scope Of Study. Twenty-one hazards were identified and the study closed cleanly.
The contractor’s assessment covered installation and stopped at handover. Nobody’s study covered condenser maintenance access, and the fall-protection anchors that would have been cheap during the upgrade were never specified. The gap surfaced eighteen months later in a routine access review, before anyone went up in winter. What the study lacked was a written exclusion with a name attached.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
3 sections
- Reference
- SAF-061
- Archetype
- Assessment
- Record ID
- HAZID-2026-000
- Scoring
- Risk band per hazard
- Direction
- High is bad
- Singleton
- No
- Basis
- ISO 45001 cl.6.1.2
- Links
- Feeds Risk Assessment
- Tags
- Risk, Design
- Sections
- 3
- Fields
- 33
- Follow up fields
- 4
- Repeating sections
- 1
- Links out
- 4
Header
11 fieldsStudy ID*
Auto sequence. Format HAZID-2026-0000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Study Date*
Facilitator*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Area
The area within the site.
Exact Location
Drop a pin for anything hard to find.
Scope Of Study*
What is in scope and, just as importantly, what is not.
Study Trigger*
Team Members*
Operations, maintenance, engineering and safety at minimum.
Hazards identified
Repeats11 fieldsHazard Category*
Hazard Description*
Where It Exists*
Who Is Exposed*
Existing Controls Known*
- Yes3 pts
- Partly1 pt
- No0 pts
Initial Risk Band*
Requires Full Assessment*
Risk Assessment
Risk ID
Format RSK-2026-00000.
Links to FDN-012 Risk ID
Potential Fatal Risk*
Anything that could kill goes to the critical risk process, not the general register.
- No3 pts
- Yes0 pts
Bowtie ID
Links to SAF-062 Bowtie ID
Result
11 fieldsHazards Identified*
Requiring Full Assessment*
Potential Fatal Risks Found*
Added To Risk Register*
- Yes3 pts
- No0 pts
Next Study Due
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Facilitator*
Signature*
SAF-061 · record IDs look like HAZID-2026-000 · Feeds Risk Assessment
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The study is a day’s work. The value is in what persists afterwards — register entries, dated reviews, verified controls — and none of it survives on goodwill.
Holds the study, the risk register and the critical control set as one connected structure, so hazards move into the register with references rather than assertions, and Next Study Due drives a real schedule.
Supplies the half of the picture the study room lacks: what actually breaks, how often, and what maintenance access looks like. It receives the engineering actions the study creates and closes them against the asset.
Carries the hazards attached to contractor activity — entries, hot work, height work on plant — so the exclusions written into scope land with a named party rather than dissolving at the boundary.
Watches coverage rather than single studies: which areas have no current study, which hazard categories never appear, which fatal-risk entries have no bowtie, which Next Study Due dates have passed.
This template lives in KnowSafe — safety and compliance. Incidents, hazards, permits, inspections and the critical controls behind them.
Meet KnowSafe→Glossary
Hazard Identification Study definitions and key terms
- HAZID
- Hazard identification study. A facilitated, checklist-driven sweep of an area or system for hazards of all classes, run early and broad, producing a list rather than a conclusion.
- Initial risk band
- The screening judgement of severity and likelihood made in the study room, used only to decide what needs full assessment. It is not the assessed risk and must never enter the register as one.
- Critical control
- A control whose failure would substantially raise the chance of a fatality, and which is verified on a schedule rather than assumed to work. A potential fatal risk routes a hazard into this set.
- Bowtie
- A diagram placing one hazardous event at the centre, with threats and preventive barriers on the left and consequences and mitigating barriers on the right. It follows a fatal-risk finding.
- Process hazard analysis (PHA)
- The regulator-recognised family of techniques — HAZOP, what-if, checklist, fault tree — required for covered processes under US process safety rules, revalidated on a fixed cycle.
FAQ
Frequently asked questions about hazard identification study
How many hazards should a study produce to look credible?+
There is no target, and setting one corrupts the exercise. What matters is the spread across Hazard Category and the presence of hazards from non-routine conditions — cleaning, changeover, breakdown, emergency response. Twelve hazards spanning operating states beats forty from normal running.
Can the facilitator also be a subject matter expert on the plant?+
It is workable but not ideal. A facilitator who knows the answers tends to supply them, and the value of the technique lies in what the room volunteers. If the facilitator must be an expert, give the challenge role to someone else.
Does a HAZID satisfy a regulatory process hazard analysis requirement?+
Sometimes, and only if scoped deliberately to do so. US process safety management accepts several methodologies but requires specific content: previous incidents, engineering controls, human factors, facility siting. A general study rarely covers all of it.
What if the study finds a hazard with no existing controls at all?+
It should not wait for the full assessment. Existing Controls Known answered No on a High or Critical band is an interim-measures decision that belongs in the room, recorded through Action Required and a CAPA reference.
How often should an area be re-studied?+
Three to five years is common and defensible for stable areas, but the cycle is a floor, not a rule. Any material change to plant, throughput, occupancy or inventory resets it. Study Trigger keeps change-driven studies distinguishable from cyclical ones.
Should contractors take part in the study?+
Where the area involves contractor activity, yes, and their absence is a common gap. Contractors do the work that generates non-routine hazards: entries, line breaks, hot work, height work on plant. If they cannot attend, name those hazards in scope.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Critical Control and Fatal Risk
Bow Tie Analysis Record
Maps threats, the top event, consequences and the barriers on each side for a major hazard
Barrier Health Review
Reviews whether the barriers relied on in a bow tie are actually in place and working
Critical Control Register
Lists the controls that stand between your people and a fatal or catastrophic event, with an owner and a required check frequency for each
Risk Assessment
The single risk assessment used across the whole business
Serious Potential Incident Report
Used when an event could have killed or seriously injured someone, whatever the actual outcome
Job Safety Analysis
Breaks a job into steps, finds the hazards in each and sets the controls
More in Risk Studies
Job Safety Analysis
Breaks a job into steps, finds the hazards in each and sets the controls
Pre-Task Risk Assessment
A short check done by the crew right before work starts, covering what has changed today
Task Risk Assessment
A fuller assessment of a task, its hazards and its controls, using the shared risk method
Bowtie Analysis
Maps a major hazard from its causes through to its consequences, and shows which barriers sit in between
What If Study
A guided team discussion asking what could go wrong at each stage of a process
Change Risk Review
Assesses the risk created by a proposed change before it goes ahead
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- ISO 45001:2018 — Occupational health and safety management systems, cl. 5.4, 6.1.2, 6.1.4, 8.1.3
- 29 CFR 1910.119(e) — Process safety management: process hazard analysis
- Directive 2012/18/EU (Seveso III), Art. 8 and Art. 10 — Control of major-accident hazards
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.