Category: Hazid standard

Hazid standard

HAZID Hazard Identification is a qualitative technique for the early identification of potential hazards and threats effecting people, the environment, assets or reputation. It is a means of identifying and describing HSE hazards and threats at the earliest practicable stage of a development or venture. The study method is a combination of identification, analysis and brainstorming by the HAZID team members.

Guidewords are used in order to identify possible potential and hazardous effects as well as threats. Furthermore the team analyses the appropriate controls that should put in place in order to prevent or control each identified threat. The analysis of HAZID will be conducted on a session basis, grouping the processes with the PFD Process Flow Diagram and plant layout into a series of sections where the various sources will have similar characteristics and hence consequences.

Any special preparations required to be taken to handle these can be pre — planned. Any specific process modifications if required can be established at an early stage. Avoids major surprises. The major benefit of HAZID is early identification and assessment of the critical health, safety and environmental hazards provides essential input to the project development decisions. Type Your Search Here.

To identify the potential hazards and to reduce the probability and consequences of an incident in site that would have a detrimental impact to the personnel plant, properties and environment. Identify opportunities for inherent safety Identify Fire, explosion, toxic release scenarios and measure to prevent it.

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Hazard and operability study

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By clicking the "Download button" you agree to the terms of our Privacy Policy. When it comes to safety in oil and gas do you want to know how to identify hazards, how to set up the study team or to execute the HAZID sessions?

This study on Hazard Identification explains how HAZID is conducted, which inputs are required and which outputs and results can be expected. Use of this site constitutes acceptance of our User Agreement and Privacy Policy. For further information on how we process and monitor your personal data click here. You can unsubscribe at anytime.

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To learn more about cookies, including how to disable them, view our Cookie Policy Close.A hazard analysis is used as the first step in a process used to assess risk. The result of a hazard analysis is the identification of different type of hazards. A hazard is a potential condition and exists or not 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 validation, more precise prediction verification and acceptance of risk is determined in the Risk assessment analysis.

The main goal of both is to provide the best selection of means of controlling or eliminating the risk. The term is used in several engineering specialties, including avionicschemical process safetysafety engineeringreliability engineering and food safety. A hazard is defined as a "Condition, event, or circumstance that could lead to or contribute to an unplanned or undesirable event. More often an accident or operational failure occurs as the result of a sequence of causes. A hazard analysis will consider system state, for example operating environment, as well as failures or malfunctions.

While in some cases, safety or reliability risk can be eliminated, in most cases a certain degree of risk must be accepted. In order to quantify expected costs before the fact, the potential consequences and the probability of occurrence must be considered. Assessment of risk is made by combining the severity of consequence with the likelihood of occurrence in a matrix. Risks that fall into the "unacceptable" category e.

IEEE STD Software Safety Plans prescribes industry best practices for conducting software safety hazard analyses to help ensure safety requirements and attributes are defined and specified for inclusion in software that commands, controls or monitors critical functions.

When software is involved in a system, the development and design assurance of that software is often governed by DOB. The severity of consequence identified by the hazard analysis establishes the criticality level of the software. Higher levels of rigor are required for level A and B software and corresponding functional tasks and work products is the system safety domain are used as objective evidence of meeting safety criteria and requirements.

Recently a leading edge commercial standard was promulgated based on decades of proven system safety processes in DoD and NASA.It is one of the techniques commonly accepted by regulators.

hazid standard

The HAZOP method identifies deviations from design intent by applying guide words, such as No, More and Less, to aspects of the design intent such as flow, temperature, pressure, addition, reaction, etc. A team of people then brainstorms causes of each deviation within each node and identifies the sequence of events that results, including safeguards that protect against them, and the consequences. Each sequence of events represents a scenario.

Also, the team may identify improvements to reduce risk. Processes must be divided into sections for detailed review. Generally, they are defined as pipe sections and vessels in which process chemicals are, or may be, present. Nodes also may be steps in a procedure for a study on procedures, or process functions, e.

This approach provides a broader view of a process but it complicates the analysis and scenarios may be missed. Typically, size is not an important attribute of a node for piping but it does influence whether a vessel is noded.

For example, a sample pot is not normally a node but a knock-out pot could be. Nodes cannot be defined uniquely for a process. However, equivalent HAZOP study results can be expected with alternative subdivisions, although that has not been proven empirically. Noding starts at the beginning of process. Each major vessel within the study scope is identified.

HAZID study procedure with excel template workbook

Starting with the first major vessel, each of its inlet lines in the main process flow path to the vessel are noded starting with the main inlet line. Next the vessel is noded.

hazid standard

Then each outlet line in the main process flow path is noded. This process is repeated for all vessels in the primary process flow path.

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Vessels and lines in side streams and other process flow paths are noded at any time in the noding process that makes sense. Global nodes are used to represent the whole process or certain aspects of it. They serve several purposes:. Initiating events may affect the entire process or parts of it, for example, some external events such as flooding, or the global loss of utilities such as electric power.

Thus, they may apply to multiple nodes or may not be specific to any particular node. Examples include facility siting, human factors, and common piping issues. HAZOP study practitioners must avoid omitting scenarios that may not be identified by focusing on individual nodes. For example, multiple failure scenarios may involve causes originating from more than one node or system. Design intent is the set of required or desired process behaviors, as intended by the process designers.A hazard and operability study HAZOP is a structured and systematic examination of a complex planned or existing process or operation in order to identify and evaluate problems that may represent risks to personnel or equipment.

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The intention of performing a HAZOP is to review the design to pick up design and engineering issues that may otherwise not have been found. The technique is based on breaking the overall complex design of the process into a number of simpler sections called 'nodes' which are then individually reviewed.

It is carried out by a suitably experienced multi-disciplinary team HAZOP during a series of meetings.

The Beginner's Guide To Hazard Identification Studies (HAZID)

The HAZOP technique is qualitative, and aims to stimulate the imagination of participants to identify potential hazards and operability problems.

Structure and direction are given to the review process by applying standardised guide-word prompts to the review of each node. The relevant international standard [1] calls for team members to display 'intuition and good judgement' and for the meetings to be held in 'a climate of positive thinking and frank discussion'.

hazid standard

The HAZOP technique was initially developed in the s to analyze major chemical process systems but has since been extended to other areas, including mining operations and other types of process systems and other complex systems such as nuclear power plant operation and software development.

It is also used as the basis for reviewing Batch processes and operating procedures.

Hazard Identification, Risk Assessment and Determining Controls – Foundation Stone of OHSAS 18001

The method is applied to complex 'processes' for which sufficient design information is available, and not likely to change significantly. 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. For each deviation, the team identifies feasible Causes and likely Consequences then decides with confirmation by subsequent risk analysis where necessary whether the existing safeguards are sufficient, or whether an Action to install an additional safeguard is necessary to reduce the risks to an acceptable level.

The degree of preparation for the HAZOP is critical to the overall success of the review - 'frozen' design information provided to the team members with time for them to familiarise themselves with the process, an adequate schedule allowed for the performance of the HAZOP, provision of the best team members for their role.

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Those scheduling a HAZOP should take into account the review scope, the number of nodes to be reviewed, the provision of completed design drawings and documentation and the need to maintain team performance over an extended time-frame. The team members may also need to perform some of their normal tasks during this period and the HAZOP team members can tend to lose focus unless adequate time is allowed for them to refresh their mental capabilities.

The team meetings should be managed by an independent, trained HAZOP Facilitator who is responsible for the overall quality of the review, partnered with a dedicated Scribe to minute the meetings. How these requirements are achieved is ultimately the responsibility of the study leader. For a medium-sized chemical plant where the total number of items to be considered is items of equipment and pipes or other transfers between them about 40 such meetings would be needed.

In order to identify deviations, the team applies systematically, in order [a] a set of Guide Words to each node in the process. To prompt discussion, or to ensure completeness, it may also be helpful to explicitly consider appropriate parameters which apply to the design intent. These are general words such as Flow, Temperature, Pressure, Composition. The current standard [1] notes that Guide Words should be chosen which are appropriate to the study and neither too specific limiting ideas and discussion nor too general allowing loss of focus.

A fairly standard set of Guide Words given as an example in Table 3 of [1] is as follows:. The last five guide words are applicable to batch or sequential operations.

Where a guide word is meaningfully applicable to a parameter e. HAZOP-type studies may also be carried out by considering applicable guide words and identifying elements to which they are applicable [1] or by considering the parameters associated with plant elements and systematically applying guide words to them; although this last approach is not mentioned in the relevant standard, its examples of output include a study B3 recorded in this way.

Once the causes and effects of any potential hazards have been established, the system being studied can then be modified to improve its safety. The modified design should then be subject to another HAZOP, to ensure that no new problems have been added. The technique can also be applied where design information is not fully available and doing so may be useful in eliminating alternative designs, before too much time is invested in them.

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However, where a design is required to have a HAZOP performed to meet legislative or regulatory requirements, such an 'early' meeting cannot be considered to comply with this requirement. The use of the term with such techniques is considered to be inappropriate and is excluded from this document.

The team should be as small as possible consistent with their having relevant skills and experience [d] A minimum team size of 4 [1] -5 [3] is recommended.

In a large process there will be many HAZOP meetings and the individuals within the team may change as different specialists are required and deputies are required for the various roles.

As many as 20 individuals may be involved [4] but is recommended that the team should not exceed 7 [1] -8 [3] at any time a larger team will make slower progress adding considerably to the costs. Each team member should have a definite role as follows [1] Note that duplication of roles e. In earlier publications it was suggested that the Study Leader could also be the Recorder [4] but separate roles are now generally recommended.It is a means of identifying and describing hazards and threats at the earliest practicable stage of a development.

Generally speaking, Hazard identification can be done at anytime, what will be different is the depth of the study at the different time. For example, Hazard identification carried out during job design will be different form what is done for an ongoing process.

Methodology adopted in this study is a combination of identification, analysis and brainstorming by the HAZID team members. Also, appropriate controls are put in place to prevent or control each identified threat at the end of the study.

This study can be carried out for a singular task or a process. This study is not done by one person, but a team. Assembling a competent team is one of the hallmark for a successful study. Within the team, a lead facilitator should be nominated to lead the study. See guide on the use of the template workbook here. An Health and Safety activist who believes in the growth and continual improvement of the profession. He is going all out to create awareness and safe precious lives. Thank you bro.

This is a great read! Your email address will not be published. Delivered by FeedBurner. Share 0. Share this: Twitter Facebook. Like this: Like Loading Next What is Safety Instrumented System. How long can coronavirus live on a surface? April 11, One of the "root causes" of workplace injuries, illnesses, and incidents is the failure to identify or recognize hazards that are present, or that could have been anticipated. A critical element of any effective safety and health program is a proactive, ongoing process to identify and assess such hazards.

Some hazards, such as housekeeping and tripping hazards, can and should be fixed as they are found. Fixing hazards on the spot emphasizes the importance of safety and health and takes advantage of a safety leadership opportunity. To learn more about fixing other hazards identified using the processes described here, see " Hazard Prevention and Control.

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Action item 1: Collect existing information about workplace hazards. Action item 2: Inspect the workplace for safety hazards. Action item 3: Identify health hazards. Action item 4: Conduct incident investigations. Action item 5: Identify hazards associated with emergency and nonroutine situations.

Action item 6: Characterize the nature of identified hazards, identify interim control measures, and prioritize the hazards for control. Information on workplace hazards may already be available to employers and workers, from both internal and external sources. Collect, organize, and review information with workers to determine what types of hazards may be present and which workers may be exposed or potentially exposed.

Information available in the workplace may include:. Hazards can be introduced over time as workstations and processes change, equipment or tools become worn, maintenance is neglected, or housekeeping practices decline. Setting aside time to regularly inspect the workplace for hazards can help identify shortcomings so that they can be addressed before an incident occurs. Note: Many hazards can be identified using common knowledge and available tools.

For example, you can easily identify and correct hazards associated with broken stair rails and frayed electrical cords. Workers can be a very useful internal resource, especially if they are trained in how to identify and assess risks. Identifying workers' exposure to health hazards is typically more complex than identifying physical safety hazards.

For example, gases and vapors may be invisible, often have no odor, and may not have an immediately noticeable harmful health effect. Health hazards include chemical hazards solvents, adhesives, paints, toxic dusts, etc. Note: Identifying and assessing health hazards may require specialized knowledge.

Small businesses can obtain free and confidential occupational safety and health advice services, including help identifying and assessing workplace hazards, through OSHA's On-site Consultation Program.

By thoroughly investigating incidents and reports, you will identify hazards that are likely to cause future harm. The purpose of an investigation must always be to identify the root causes and there is often more than one of the incident or concern, in order to prevent future occurrences.

Effective incident investigations do not stop at identifying a single factor that triggered an incident. They ask the questions "Why? It asks such questions as: "Was the worker provided with appropriate tools and time to do the work? OSHA must be notified within 8 hours of a work-related fatality, and within 24 hours of an amputation, loss of an eye, or inpatient hospitalization.

Emergencies present hazards that need to be recognized and understood.

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