Steps to Conduct a Hazard Identification Study on a New Process Line

A new process line should enter service only after its hazards have been identified, understood and controlled. Conducting a hazard identification study before construction, commissioning or handover gives the project team time to change the design rather than inherit an expensive problem. It also creates a clear record showing that people, equipment, substances and the wider work environment were considered from the outset.

In Australia, this work sits within the Work Health and Safety framework administered by each state or territory regulator. Safe Work Australia’s model Codes, including How to Work Safely, provide national guidance, while requirements may differ between WorkSafe Queensland, Safe Work NSW and WorkSafe WA. Organisations should also consider relevant AS/NZS standards, such as AS/NZS ISO 45001, when setting risk-management processes.

A hazard identification study, commonly called a HAZID, examines what could cause harm across the complete process line. It is broader than a final risk assessment because the team first searches for possible failure modes, unsafe conditions and missing safeguards. A HAZOP may follow if the design is sufficiently complex or hazardous for a detailed node-by-node study.

The study is most effective when it is treated as active design assurance rather than paperwork for approval. Experienced operators, maintenance technicians and contractors should help identify practical problems that may not appear in a process flow diagram. The output must be usable during construction, pre-start checks, training and day-to-day operations.

Prepare the study and assemble the right team

Begin by defining the study boundary. Identify where the new process line begins and ends, including原料 receiving, storage, dosing, reaction, separation, heating, cooling, compression, venting and discharge. Set clear objectives, nominate a study leader and agree on the timetable. Where the design is changing rapidly, formalise the process through a management of change procedure so decisions are linked to the current revision of the equipment.

The team should include the process engineer, operations supervisor, maintenance representative, electrical and instrumentation specialists, production personnel and health and safety adviser. People who clean vessels, change diaphragms, isolate valves or handle samples can reveal hazards missed by the project engineers. Contractors and laboratory staff should also contribute because their tasks may differ from those of permanent employees. Workers must be consulted throughout the study rather than simply being presented with the completed findings.

Before the workshop, collect current drawings, process and instrumentation diagrams, equipment data, safety data sheets, design risk assessments and relevant lessons learned from similar plants. Check the applicable Australian regulatory requirements and the organisation’s own risk criteria. A risk matrix must reflect the company’s risk appetite and operational experience; importing a matrix from another site without checking its terminology and thresholds can produce misleading results.

Map the process and identify all credible hazards

Begin the identification process with a physical walk-through of the proposed or partially installed line. Follow the flow from start to finish and look for inaccessible isolation points, overlapping hose connections, shared services, drainage routes, vents and emergency exits. Compare what is installed with the latest drawings. In a complex facility such as a LNG, mineral-processing or chemical plant in the Pilbara, Karratha or Gladstone, a clear boundary between old and new equipment is particularly important.

Consider chemical, physical, biological, ergonomic and organisational hazards together. Potential hazards include toxic or flammable substances, high pressure, extreme temperature, rotating machinery, hot work, stored energy, electric shock, noise, dust, manual handling, fatigue, noise, vehicle interaction and loss of containment. A new line may also introduce pinch points, trip hazards, poor lighting, restricted access or emergency shutdown arrangements that cannot be seen on a P&ID.

Do not restrict the study to normal steady-state operation. Examine commissioning, start-up, shutdown, cleaning, sterilisation, sampling, line clearance, changeover, maintenance and decommissioning scenarios. Ask what happens when a utility fails, an operator is absent, a control valve sticks, a relief system activates or another plant sends unexpected material into the shared system. Where simultaneous operations are possible, document the interactions. Remote sites in rural Australia also need consideration of severe heat, cyclone exposure, emergency travel times and limited access to specialist medical support.

Assess the risk and select effective controls

Once hazards have been identified, assess the risk associated with each credible scenario. Consider the likelihood, potential consequence, frequency of exposure, number of people affected and the controls already provided. Assess consequences for people, the environment, equipment, production and reputation. The recorded risk should describe the unmanaged exposure before proposed controls are credited, allowing reviewers to see what will change after the design is modified.

Apply the hierarchy of controls deliberately. Elimination is the strongest option, followed by substitution and engineered safeguards such as intrinsically safe equipment, automated isolation, containment, interlocks, alarms and remote-operated valves. Administrative controls including procedures, training, permits, inspections and supervision should support the physical safeguards, not replace them. Personal protective equipment belongs at the point where residual exposure cannot reasonably be removed. Control decisions should demonstrate that risk has been reduced so far as is reasonably practicable, in line with Australian WHS expectations.

Think about how the work will actually be performed. A permit to work may be needed for high-risk tasks, but a permit cannot make an unsafe design acceptable. Isolation and lockout or tagout procedures must identify every energy source, including hydraulic, pneumatic, gravitational, thermal and electrical energy. Gas testing, ventilation, emergency stop arrangements and rescue provisions may be necessary for confined-space entry. Australian teams commonly use terms such as “prestart check”, “job safety analysis” and “stop the job”, so these activities should have an agreed meaning and trigger conditions. Workers must know when to stop work without worrying that raising an alarm will be treated as a failure.

Validate the controls before commissioning

Test the proposed safeguards with the people who will use and maintain them. Walk the line again with operators and technicians, describe each operating scenario and ask whether every required action can be performed in the time available. Check alarm priorities, instrument locations, control panel access, valve handles, emergency stops and escape routes. A control that is difficult to reach, poorly labelled or routinely overridden should be treated as an unresolved hazard.

For safety-critical controls, establish the required performance and proof-test regime. This may include pressure tests, relief-system calculations, interlock verification, functional tests of safety instrumented functions and checks of backup power or communications. Use the HAZID to identify assumptions for later validation. If a question needs systematic examination, such as the effect of a blocked outlet or failed reflux pump, a focused HAZOP or what-if study can provide additional assurance without duplicating the broader HAZID.

Commissioning should confirm that the controls work as intended under realistic conditions. Use staged trials, water circulation, inerting or other appropriate methods before introducing hazardous materials, and include emergency exercises for credible release, fire, medical emergency and evacuation scenarios. Check that operating procedures, training, PPE, spares and maintenance plans are ready for handover. Actions identified during the study should be closed or formally risk-assessed before the line is energised or production begins.

Record the findings and turn them into action

Produce a HAZID report that can be understood by designers, operators and managers. Give each hazard a unique reference and record the source, scenario, existing safeguards, recommended controls, responsible owner, due date and residual risk. Explain why each control is considered adequate and identify any assumptions or limitations. Retain supporting calculations, marked-up drawings and workshop attendance so the study remains traceable throughout the project.

Link the resulting action tracker to the design, construction and commissioning schedule. Update equipment lists, P&IDs, operating procedures, emergency plans, training materials and permit requirements as decisions are made. Communicate the outcomes through toolbox talks, shift handovers and practical operator training. The hazard register should remain accessible and be reviewed whenever the process, equipment, materials, personnel or surrounding operations change. A living register supports dynamic risk assessment and prevents the original HAZID from becoming an outdated document.

Practical preparation improves the quality of the next study. HCF CATCH offers hands-on safety, process, engineering and electrical training in a realistic live-process-plant environment, allowing teams to practise hazard analysis, safe isolation and emergency decision-making before applying them at their own sites. Australian organisations should confirm that any formal training or qualification meets local regulatory and competency requirements. Contact HCF CATCH to discuss practical training options, facility tours and ways to strengthen your team’s hazard identification capability.