HAZOP AND HAZAN PDF

HAZAN stands for Hazard Analysis and is a technique that focuses on job tasks as a way to identify hazards before they occur. HAZAN takes into account the relationship between the employee, the task to be done, the tools at the workers disposal and the surrounding environment. Once uncontrolled hazards have been identified by a HAZAN analysis, steps can be taken to either eliminate risks or reduce risk to an acceptable level. HAZAN is appropriate for all types of jobs in the workplace. However, priority should be given to jobs that have the highest illness or injury rates. Jobs that have the potential to cause severe or disabling injuries or illness should also be prioritized.

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Hazard, Hazid hazard identification , Hazan hazard analysis , and Hazop hazard and operability studies are important safety and risk management techniques in the steel industry Fig 1. Hazard is a potential cause to generate a disaster. It has got the potential to cause i serious harm to the individual or the environment, ii harm, the severity of which depends on the extent and frequency of exposure to the hazard, and iii harm that does not usually occur, or is not usually detectable until a significant time years after exposure to the known hazard.

Any activity, procedure, plant, process, substance, situation or other circumstance that has the potential to cause harm constitutes a hazard. Hazards are logically classified in the same way as the disaster events are classified. Since a hazard exists because it may result into a disaster, it is usually viewed as natural based, human systems based, or conflict based. Not every hazard results into a disaster, but every disaster is the result of a hazardous condition, whether or not that condition was recognized in advance of the event.

Hazards are normally not identical, not uniform, not exclusive, and not transposable. They are not uniform in their range of occurrence, impacts, or timelines. They have got non identical pattern of development. Hence each hazard is to be understood in the context of its time and place. One hazard generally does not substitute for another, at least at the higher level of classification. For the characterization of hazards, the following are the key indicators in terms of the situation.

The more severe the magnitude of the event or the intensity of impact, the higher is the hazard. Events which can occur at any time of day throughout the year pose a different type of hazard than those that are seasonal or that commonly occur during only part of the day.

The individual event in a restricted season may be of catastrophic intensity. The longer the event duration the greater the hazard. It is necessary to consider both the impact and the recovery periods, which may be prolonged for weeks, months, or years. The shorter the timeline for development of the event the higher the hazard. The presence of critical facilities in the probable impact zone increases the hazard. This includes facilities necessary for the coordination of disaster response or the operation of emergency teams.

The more often events happen the greater the hazard because of cumulative effects. This is not universally so. Events that are difficult to predict, create a higher hazard because of the lack of reliable signals that protective measures are necessary. Also events that trigger other events or that cause cascading effects are higher in their hazard potential than events that do not typically do so.

Hazid stand for hazard Identification. Steel industry, which is a high risk industry, often requires that all hazards with the potential to cause a major accident are identified. Hazid is a high level hazard identification technique which is commonly applied on an area by area basis to hazardous installations.

Hazid study is the systematic method of identifying hazards to prevent and reduce any adverse impact that could cause injury to personnel, damage or loss of property, environment and production, or become a liability. It is a component of the risk assessment and risk management. It is being used to determine the adverse effects of exposure to hazards and to plan necessary actions to mitigate such risks.

Hazid is one of the best known methodologies to identify potential hazards because it provides a structured approach to identify hazards, potential undesirable consequences, and evaluate the severity and likelihood of what is identified.

Hazid involves machine or equipment designers, management and end users, and ensures a full identification of hazards and safeguard procedures in a workplace. Through Hazid, management identifies, in consultation with employees, contractors as far as is practicable and safety personnel the following. Hazid is a transparent process and is critical to the safety of the plant, equipment, and operating personnel.

The benefits of Hazid studies include the following. Hazan is a hazard analysis and is a term used in safety engineering for the logical, systematic examination of an item, process, condition, facility, or system to identify and analyze the source, causes, and consequences of potential or real unexpected events which can occur.

A hazard analysis considers system state e. Hazan is the identification of undesired events that lead to the materialization of a hazard, the analysis of the mechanisms by which these undesired events could occur, and, usually, the estimation of the consequences. Every hazard analysis consists of the following three steps. Hazan is therefore the essential prerequisite for the complete risk assessment process which includes i analysis of the hazards, ii assessment of the risks which the hazards present, and iii determination of ameliorating measures, if any, required to be taken.

Hazan is the first step in the process used for the assessment of the risk. The result of a hazard analysis is the identification of different type of hazards. A hazard is a potential condition which either exists or not exists probability is 1 or 0. It may in single existence or in combination with other hazards sometimes called events and conditions become an actual functional failure or accident mishap.

The way this exactly happens in one particular sequence is called a scenario. This scenario has a probability between 1 and 0 of occurrence. Often a system has many potential failure scenarios. It also is assigned a classification, based on the worst case severity of the end condition.

Risk is the combination of probability and severity. Preliminary risk levels can be provided in the hazard analysis. The main goal of hazan is to provide the best selection of means of controlling or eliminating the risk. 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.

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. Hazard, Hazid, Hazan and Hazop — part of Safety and Risk Management satyendra April 29, 0 Comments hazan , Hazard , hazid , hazop , Safety , safety management , Hazard, Hazid, Hazan and Hazop — part of Safety and Risk Management Hazard, Hazid hazard identification , Hazan hazard analysis , and Hazop hazard and operability studies are important safety and risk management techniques in the steel industry Fig 1.

There are the following two possible purposes in identifying hazards. To obtain a list of hazards for subsequent evaluation using other risk assessment techniques. To perform a qualitative evaluation of the significance of the hazards and the measures for reducing the risks from them. All reasonably foreseeable hazards at the plant that may cause a major accident The kinds of major accidents that may occur at the plant, the likelihood of a major accident occurring and the likely consequences of a major accident.

Prior to modification of any facility Prior to change in the method of work or workforce Before and during abnormal operations, troubleshooting Plant condition monitoring, early warning signals, employee feedback from routine participation in work, and after an incident. It is a flexible method which is applicable to any type of installation It reveals hazards at an early stage before they happen It leverages the experience of operating personnel as part of the team It identifies hazards, cause and consequences as well as preventive measures Hazards are recorded and managed to be avoided, mitigated or highlighted It establishes screening criteria for hazards Non critical hazards are documented to demonstrate that the events in question could be safely ignored Hazard analysis or Hazan Hazan is a hazard analysis and is a term used in safety engineering for the logical, systematic examination of an item, process, condition, facility, or system to identify and analyze the source, causes, and consequences of potential or real unexpected events which can occur.

Estimating how often the incident will occur. Estimating the consequences for the employees, the process, the plant, the public and the environments. Comparing the results of first two steps with a target or criterion to decide whether or not action to reduce the probability of occurrence or to minimize the consequences is desirable, or whether the hazard can be ignored, at least for the time being. 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.

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.

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. Management of Logistics April 29, 0 Comments satyendra. Leave a Comment Cancel Reply. Login Your Account Enter your e-mail address and your password.

Remember Me Forgot Password? Register Your Account Create your account. Reduces the capability of the system or the operator ability to cope with adverse conditions to the extent that there would be:. Reduces the capability of the system or the operators to cope with adverse operating conditions to the extent that there would be:. Does not significantly reduce system safety.

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HAZOP/HAZAN

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