Hazard and Operability (HAZOP) study is a systematic and structured technique used to identify potential hazards, operational problems, and deviations from the intended design of a process or system. It is widely used in chemical industries, oil and gas plants, power plants, pharmaceutical industries, and other high-risk facilities. The main objective of HAZOP is to identify problems before they lead to accidents, equipment damage, environmental pollution, or loss of production. The first step is to define the scope and objectives of the study. The boundaries of the system, plant, process, or operation to be examined are clearly established. The study team determines which units, processes, equipment, and operating conditions will be included. Relevant design information, safety objectives, and risk criteria are also identified. The second step is to collect and review the required information. Important documents include process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs),