HAZOP means Hazard and Operability Study and is a systematic method for identifying hazards and evaluating safeguards. The methodology is in line with internationally recognised Risk Assessment techniques, such as: IEC EN 61511-2, EN ISO 17776.

HAZOP is a structured “brainstorming”, based on assumed deviations from normal operation that could represent hazards. The system is divided into manageable sections (nodes), deviations are determined using parameters and key words, then possible consequences as well as existing safeguards are identified. The HAZOP-Team decides whether the safeguards are sufficient based on risk evaluation (usually based on Client’s Risk Acceptance Criteria). If residual risk is not acceptable or ALARP, additional measures or further investigation are recommended.