HAZOP HAZAN PDF

Or to ensure the ability of equipments in accordance with the design intent. The HAZOP analysis technique uses a systematic process to identify possible deviations from normal operations and ensure that appropriate safeguards are in place to help prevent accidents. It uses special adjectives combined with process conditions to systematically consider all credible deviations from normal conditions. In addition to its utility in Quality Risk Management, HAZOP is also commonly used in risk assessments for industrial and environmental health and safety applications. Deviations from design or operational intent may constitute or produce a hazard.

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Actions required by operators are well within their capabilities. May occur several times in the life of an entire system or group of equipment. May occur a few times in the life of an entire system or group of equipment. Protective system — A device installed to prevent the hazard occurring.

Test interval — The time interval between the testing of a protective system, and its replacement if necessary. Hazard and operability study or Hazop A hazard and operability Hazop study is a design review technique used for hazard identification, and for the identification of design deficiencies which may give rise to operability problems.

It is a structured and systematic examination of a planned or existing process or operation in order to identify and evaluate problems that may represent risks to personnel or equipment, or prevent efficient operation. Hazop is most commonly applied to systems which transfer or process hazardous substances, or activities where the operations involved can be hazardous and the consequences of failure to control hazards may be significant in terms of damage to life, the environment or property.

A hazop study is carried out using a structured approach by an experienced multi-discipline team, facilitated by a hazop leader. The hazop technique is qualitative, and aims to stimulate the imagination of participants to identify potential hazards and operability problems.

Hazop is a structured and systematic technique for system examination and risk management. In particular, Hazop is often used as a technique for identifying potential hazards in a system and identifying operability problems likely to lead to nonconforming products. Hazop is based on a theory that assumes risk events are caused by deviations from design or operating intentions. This approach is a unique feature of the Hazop methodology that helps stimulate the imagination of team members when exploring potential deviations.

As a risk assessment tool, Hazop is often described as the following. A brainstorming technique. A qualitative risk assessment tool. The objectives of the hazop studies are the following.

Identify hazards and operability issues associated with the design. Identify deviations from design intent, deviation causes, consequences, and safeguards. However, risk assessment teams may choose to rate these factors in order to further quantify and prioritize risks if needed. Hazop is best suited for assessing hazards in facilities, equipment, and processes and is capable of assessing systems from multiple perspectives which include the following.

Design — This includes i assessment of system design capability to meet user specifications and safety standards, and ii identification of the weaknesses in systems. Physical and operational environments — It includes assessment of the environment to ensure system is appropriately situated, supported, serviced, contained, etc.

Operational and procedural controls — These includes i assessing engineered controls ex: automation , sequences of operations, procedural controls ex: human interactions etc. Advantages of Hazop technique are as follows. Helpful when confronting hazards that are difficult to quantify Hazards rooted in human performance and behaviors Hazards that are difficult to detect, analyze, isolate, count, predict, etc. No means to assess hazards involving interactions between different parts of a system or process No risk ranking or prioritization capability Teams may optionally build-in such capability as required No means to assess effectiveness of existing or proposed controls safeguards May need to interface Hazop with other risk management tools.

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HAZOP/HAZAN

Actions required by operators are well within their capabilities. May occur several times in the life of an entire system or group of equipment. May occur a few times in the life of an entire system or group of equipment. Protective system — A device installed to prevent the hazard occurring. Test interval — The time interval between the testing of a protective system, and its replacement if necessary. Hazard and operability study or Hazop A hazard and operability Hazop study is a design review technique used for hazard identification, and for the identification of design deficiencies which may give rise to operability problems. It is a structured and systematic examination of a planned or existing process or operation in order to identify and evaluate problems that may represent risks to personnel or equipment, or prevent efficient operation.

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For example, a prudent designer will have allowed for foreseeable variations within the process creating a larger design envelope than just the basic requirements and the HAZOP will be looking at ways in which this might not be sufficient. The extent of each node should be appropriate to the complexity of the system and the magnitude of the hazards it might pose. However, it will also need to balance between "too large and complex" fewer nodes, but the team members may not be able to consider issues within the whole node at once and "too small and simple" many trivial and repetitive nodes, each of which has to be reviewed independently and documented. For each node in turn the HAZOP team uses a list of standardised guide-words and process parameters to identify potential Deviations from the design intent.

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