What a HAZID study is
HAZID refers to hazard identification and is also used for structured reviews carried out by a team. Its purpose is to recognise what could cause harm, who could be affected and how the scenario might develop. It is useful when starting a project, modifying a facility or reviewing a complex activity before selecting more detailed analyses.
Related concept: Hazard identification.
Defining the review boundaries
The areas, phases and situations included must be established: normal operation, startup, shutdown, cleaning, maintenance and foreseeable emergencies. Interfaces with other equipment or companies also matter. If the scope is limited to steady production, tasks with significant risks may be excluded.
Drawings, inventories and procedures help, but the review needs knowledge of actual work. Participation by operations and maintenance personnel helps reveal differences between the intended design and what happens during an intervention.
The team and its questions
The facilitator structures the discussion and prevents a rushed solution from closing a question before it has been analysed. The recorder must distinguish hazards, causes, consequences, existing measures and proposed actions. What-if questions can be a tool within the study; these names do not always describe completely separate methods.
A good record allows another person to understand the scenario without having attended the meeting. Expressions such as “general risk” or “take care” do not provide a sufficient basis for decisions.
Differences from HAZOP and QRA
HAZOP examines deviations from design intent using a specific structure, usually involving nodes and guide words. A QRA can quantify selected scenarios. HAZID often provides the broad initial identification, but its depth depends on the agreed scope.
Completing a HAZID session does not automatically mean that all risks have been adequately assessed. Industrial hygiene, ergonomic, fire or functional-safety studies may also be needed.
Hypothetical example
Before a new line is installed, a team reviews material receipt, operation and cleaning. It finds that clearing a blockage requires approaching a conveyor connected to another machine. The record describes the interaction and assigns a review of the isolation boundaries. The action is verified before the intervention procedure is approved.
Closing out the study
Each recommendation needs an owner, an acceptance criterion and evidence of completion. When a proposal is not adopted, the technical reasoning must be retained. The hazard list is reviewed when equipment, substances or working methods change. This makes the study a basis for decisions rather than merely meeting minutes.
