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Hazard and Operability Analysis (HAZOP)

What is a HAZOP Study?

Hazard and Operability (HAZOP) is the most widely used Process Hazard Analysis (PHA) technique. It provides a way of systematically identifying causes of deviations from a process design intention, which in turn reveals potential hazardous scenarios and allows understanding of them and how to prevent them from occurring. HAZOP studies are performed as multi-disciplinary brainstorming workshops.


Why perform HAZOP

Do you need a structured and detailed review of your process design to identify and manage process-related hazards? Then HAZOP is the optimal hazard analysis methodology.


HAZOP studies are performed to:


  • Methodically examine processes and operating systems to identify how they might deviate from the design intent;

  • Prevent process-related accidents and incidents by evaluating process design with regards to safety (of people, the environment, or assets) and operability;

  • Identify deviations from related standards and project requirements;

  • Identify requirements for additional risk-reduction


HAZOP studies are also great tools for the team to gain a higher understanding of the process and the available process safety documentation.


HAZOP Study Methodology

HAZOP studies are conducted as structured and multi-disciplinary brainstorming workshops to identify process-related hazards and operability issues, evaluate their consequences, and assess whether adequate safeguards are in place to prevent or control these hazardous scenarios.


The HAZOP technique is based on the systematic use of process deviations composed of a combination of guidewords and process parameters. Examples of HAZOP study guidewords, parameters, and the corresponding deviations are shown below:

Benefits of a HAZOP Study:

The structured nature of the analysis ensures that hazards and operability concerns are identified and recorded in a thorough and systematic way. By applying guidewords meant for brainstorming the methodology allows for a consistent approach and ensures that all relevant aspects are considered and discussed. A well-conducted HAZOP serves as a robust foundation for further analyses and decision-making, including being the foundational block for Functional Safety.

ORS Consulting has extensive experience with facilitating and recording HAZOP studies. Our principal consultants have extensive HAZOP experience for a wide variety of industrial applications. ORS combines technical knowledge and process know-how with experience and up-to-date competence related to relevant regulations and best practices (such as IEC 61882).

HAZOP Analysis Methodology Flow Diagram
HAZOP Analysis Methodology Flow Diagram

More relevant insights about HAZOP:

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