The document provides an overview of fault tree analysis (FTA). It defines FTA as a technique used in probabilistic risk assessment to identify and analyze the causes of failures in systems. The FTA process involves defining an undesired top event, constructing a fault tree by tracing the top event to intermediate and basic causal events using logic gates, and analyzing the tree both qualitatively and quantitatively. The document outlines the key steps and considerations in performing an FTA, including defining the scope and resolution, constructing the fault tree, analyzing minimal cut sets, and quantifying failure probabilities.
- Fault tree analysis (FTA) is a systematic method used to examine systems from a top-down perspective to determine the causes of failures or accidents. It involves constructing a fault tree diagram with a top event and underlying causes.
- FTA was first developed at Bell Labs in 1962 for safety analysis of missile systems. It has since been widely used, especially in aerospace and nuclear industries.
- Constructing a fault tree provides benefits like understanding failure logic, evaluating failure probabilities, and determining improvement opportunities. It allows for both qualitative and quantitative reliability analysis.
The document discusses various hazard analysis techniques used in industrial safety, including fault tree analysis (FTA) and failure mode and effects analysis (FMEA). It provides an overview of FTA, including its basic structure, events, gates, functions, advantages, and disadvantages. It also summarizes FMEA, describing what a failure mode is, the uses and contents of a FMEA form, and the advantages and disadvantages of FMEA. The document aims to introduce these two key hazard analysis methods used for risk assessment in industrial systems.
This document provides an overview of fault tree analysis including:
- Fault tree analysis models possible failure combinations using logic gates like AND and OR to relate events leading to an undesired top event.
- It involves defining the system, top event, tree structure, then exploring each branch in detail until all failure pathways are identified.
- Boolean algebra is used to evaluate the tree qualitatively by finding minimal cut sets, and quantitatively by calculating failure probabilities.
- An example fault tree is provided for a simple electric motor circuit to demonstrate the construction process and rules.
FAULT TREE ANALYSIS (FTA) SEMINAR PRESENTATIONOrange Slides
Fault tree analysis is a method to analyze the failure of a particular product or system through boolean logic technique. It is widely used by the Safety engineers and Reliability engineers.
Fault tree analysis is a technique used to analyze all possible failure mechanisms in complex systems. It uses logical diagrams and gates to model how failures of individual components can combine to cause higher-level failures or accidents. The document describes the basic components of a fault tree including the top event, basic events, logic gates, and provides rules for constructing a fault tree. An example fault tree is constructed to analyze why a motor may fail to operate.
This document discusses fault tree analysis and event tree analysis as methods for risk analysis. It provides examples of a fault tree for an electrical accident and an event tree for a fire. It also outlines the steps to draw a fault tree, including determining the undesirable head event and causal events, and represents the relationships with AND and OR gates. Fault trees can be used to identify underlying causes of accidents and prevent future incidents.
This document provides an introduction to Failure Mode and Effects Analysis (FMEA) and Failure Mode, Effects, and Criticality Analysis (FMECA). It defines what FMEA/FMECA are, discusses their importance and history of use. The document outlines the FMEA/FMECA process, including defining the system, identifying failure modes and effects, performing criticality analysis, and documenting results. It also covers FMEA/FMECA standards and guidelines and provides examples of different types that can be performed.
Fault tree analysis (FTA) is a technique used in probabilistic risk assessment to model and analyze failure processes in engineering systems. The key steps in FTA include identifying an undesired event, constructing a fault tree with that event at the top using logic gates, and evaluating the tree to calculate failure probabilities and system reliability. FTA can help understand logic leading to failures, prioritize contributors, prevent failures through proactive measures, monitor system performance, and optimize resource usage in system design and diagnosis.
- Fault tree analysis (FTA) is a systematic method used to examine systems from a top-down perspective to determine the causes of failures or accidents. It involves constructing a fault tree diagram with a top event and underlying causes.
- FTA was first developed at Bell Labs in 1962 for safety analysis of missile systems. It has since been widely used, especially in aerospace and nuclear industries.
- Constructing a fault tree provides benefits like understanding failure logic, evaluating failure probabilities, and determining improvement opportunities. It allows for both qualitative and quantitative reliability analysis.
The document discusses various hazard analysis techniques used in industrial safety, including fault tree analysis (FTA) and failure mode and effects analysis (FMEA). It provides an overview of FTA, including its basic structure, events, gates, functions, advantages, and disadvantages. It also summarizes FMEA, describing what a failure mode is, the uses and contents of a FMEA form, and the advantages and disadvantages of FMEA. The document aims to introduce these two key hazard analysis methods used for risk assessment in industrial systems.
This document provides an overview of fault tree analysis including:
- Fault tree analysis models possible failure combinations using logic gates like AND and OR to relate events leading to an undesired top event.
- It involves defining the system, top event, tree structure, then exploring each branch in detail until all failure pathways are identified.
- Boolean algebra is used to evaluate the tree qualitatively by finding minimal cut sets, and quantitatively by calculating failure probabilities.
- An example fault tree is provided for a simple electric motor circuit to demonstrate the construction process and rules.
FAULT TREE ANALYSIS (FTA) SEMINAR PRESENTATIONOrange Slides
Fault tree analysis is a method to analyze the failure of a particular product or system through boolean logic technique. It is widely used by the Safety engineers and Reliability engineers.
Fault tree analysis is a technique used to analyze all possible failure mechanisms in complex systems. It uses logical diagrams and gates to model how failures of individual components can combine to cause higher-level failures or accidents. The document describes the basic components of a fault tree including the top event, basic events, logic gates, and provides rules for constructing a fault tree. An example fault tree is constructed to analyze why a motor may fail to operate.
This document discusses fault tree analysis and event tree analysis as methods for risk analysis. It provides examples of a fault tree for an electrical accident and an event tree for a fire. It also outlines the steps to draw a fault tree, including determining the undesirable head event and causal events, and represents the relationships with AND and OR gates. Fault trees can be used to identify underlying causes of accidents and prevent future incidents.
This document provides an introduction to Failure Mode and Effects Analysis (FMEA) and Failure Mode, Effects, and Criticality Analysis (FMECA). It defines what FMEA/FMECA are, discusses their importance and history of use. The document outlines the FMEA/FMECA process, including defining the system, identifying failure modes and effects, performing criticality analysis, and documenting results. It also covers FMEA/FMECA standards and guidelines and provides examples of different types that can be performed.
Fault tree analysis (FTA) is a technique used in probabilistic risk assessment to model and analyze failure processes in engineering systems. The key steps in FTA include identifying an undesired event, constructing a fault tree with that event at the top using logic gates, and evaluating the tree to calculate failure probabilities and system reliability. FTA can help understand logic leading to failures, prioritize contributors, prevent failures through proactive measures, monitor system performance, and optimize resource usage in system design and diagnosis.
Fault Tree Analysis (FTA) is a systematic method that examines a system from the top down to identify the causes of failures. It involves defining an undesired event, then resolving it into immediate and basic causes through deductive reasoning. A logical fault tree diagram is constructed using graphical symbols to show the relationships between events. FTA is used to identify weaknesses, assess reliability and safety, prioritize contributors to failure, and optimize testing and maintenance.
This document provides an overview of fault tree analysis, including its origins in 1962 for the US Air Force, how it is a graphical model of pathways leading to an undesirable loss event using logic symbols, and some key steps and rules in developing a fault tree analysis. It defines important terms like fault, failure, primary and secondary failures. It also illustrates some common logic symbols used and provides examples of potential top events to analyze.
The document discusses plant maintenance strategies and terminology. It outlines various types of maintenance including corrective, preventative, and predictive maintenance. It emphasizes the importance of aligning maintenance goals with business goals to improve processes, asset performance, and uptime. Various maintenance planning, control, and terminology are defined to effectively manage strategic assets.
Fault tree analysis (FTA) and event tree analysis (ETA) are probabilistic risk assessment techniques. [FTA] works backwards from an accident to identify causes, representing them in a logic diagram with gates and basic events. [ETA] works forwards from an initiating event through safety functions to outcomes. The document outlines the steps and uses of FTA and ETA, providing examples to illustrate fault tree and event tree construction and accident sequence description.
The document discusses Failure Mode, Effects and Criticality Analysis (FMECA) which is a step-by-step approach to identify all possible failures in a design. It defines key terms like failure modes, effects and criticality. The document outlines the phases, purpose, benefits and techniques of FMECA including hardware and functional approaches. It provides examples of applying FMECA to analyze components and recommends corrective actions to address high risks.
The document discusses Failure Mode and Effects Analysis (FMEA), a systematic method for evaluating potential failures in design, manufacturing, and production processes. It was originally developed in the 1940s for the military and is now commonly used in various industries. An FMEA involves analyzing how and how often a process might fail and classifying the failures by severity, occurrence, and detection. The analysis helps prioritize risks and identify actions needed to prevent failures.
This document provides guidance on conducting an Equipment Criticality Analysis (ECA). The ECA process identifies equipment that is most critical to business goals. It describes preparing for the analysis, including developing an equipment hierarchy and defining assessment criteria. The ECA evaluates the potential impact of equipment failure across categories like safety, quality, costs. This helps prioritize critical equipment and reliability improvement projects.
This document discusses reliability centered maintenance (RCM). RCM aims to provide required system functions with maximum reliability and availability at lowest cost. It employs various maintenance techniques like preventive maintenance, predictive testing, and repair. A key part of RCM is failure modes and effects analysis (FMEA) which identifies potential failure modes and their consequences. RCM analysis determines appropriate tasks to address failures based on probabilities and system reliability calculations. The goal is to minimize failures and costs over the system's lifecycle.
Fault tree analysis (FTA) is a deductive technique used to determine the causes of accidents or failures. It uses a graphical representation in the form of a fault tree to visually display the logical relationships between different failures or sub-events and an undesired top event. The fault tree shows how combinations of failures, events, or conditions can lead to specified hazards through different gates like AND and OR gates. FTA involves defining the top event, constructing the fault tree, validating it, and studying alternatives to recommend actions to improve system reliability.
Fault tree analysis (FTA) is a systematic approach to identify potential causes of failures using a fault tree diagram with a top-down graphical representation. The main purpose is to help identify causes of system failures before they occur. It involves identifying a top undesired event and breaking it down into intermediate events and lowest level basic causes using logic gates. FTA provides benefits like prioritizing issues, evaluating reliability, and designing tests and maintenance procedures. It should be performed to increase reliability, identify weaknesses, and calculate failure probabilities.
FMEA is a systematic method for evaluating potential failures in a design, manufacturing or assembly process. It involves analyzing possible failures, identifying their causes and effects, and prioritizing issues based on severity, occurrence, and detection. The process results in a risk priority number to determine which failures should be addressed first. FMEA is widely used in industries like automotive, aerospace, healthcare to prevent failures and improve quality and safety.
Fault Tree Analysis-Concepts and Application-Bill VeselyMassimo Talia
During the e-gate 46200 project in Logistics, i was involved in the hours of education in the study of FTA applied to the case project. This is an application of FTA in a real industrial case. This is a methodology evaluates the causes of a given undesired event.
The document discusses various maintenance strategies including reactive, preventive, predictive, proactive, and reliability centered maintenance. Reactive maintenance involves repair after failure, while preventive maintenance uses scheduled inspections and repairs. Predictive maintenance utilizes condition monitoring to detect failures before they occur. Proactive maintenance focuses on identifying and correcting abnormal causes of failure. The goal is to preserve asset functions throughout their lives in the most cost effective way.
The document discusses industrial safety. It outlines the importance of industrial safety in reducing costs for employers and employees. It then discusses causes of industrial accidents, measures to ensure safety like safety policies and committees, and methods for measuring and recording accidents. Key safety rules from the Factories Act are also summarized.
ABOUT THE TRAINING PROGRAM :-
Failure Mode and Effects Analysis or FMEA is a structured technique to analyze a process to determine shortcomings and opportunities for improvement. By assessing the severity of a potential failure, the likelihood that the failure will occur, and the chance of detecting the failure, dozens or even hundreds of potential issues can be prioritized for improvement.
DESIGNED FOR :-
Sr. Engineer, Engineer, Supervisor and Foreman engaged in maintenance, operation, Store, Supply chain, Quality, Safety and Engineering activities.
OBJECTIVE :-
Employees completing this training will be able to effectively participate on an FMEA team and can make immediate contributions to quality and productivity improvement efforts.
This document presents a case study on implementing an effective preventive maintenance (PM) scheduling system. It analyzes PM practices in a semiconductor company with 109 machines and identifies issues like inefficient scheduling and lack of prioritization of critical machines. Data on machine downtimes from January to September 2011 is collected and the highest downtime months/machines are identified. Root cause analysis finds the main causes are wear and tear from chemicals and technical issues. The document proposes clustering machines, distinguishing critical machines, integrating PM with production planning, and training technicians to help reduce downtimes and improve PM effectiveness.
The document discusses Fault Tree Analysis (FTA), a method used to analyze potential failures in complex systems. FTA uses graphical models and Boolean logic to break down potential causes of an undesired event ("top event"). The document provides an overview of FTA methodology, symbols, history of use in industries like aerospace and nuclear power, and mathematical foundations. It also gives examples of how FTA can be used to identify critical failures, optimize reliability, and assist in system design.
A Hazard and Operability (HAZOP) study is a structured technique used to identify potential problems in processes. It involves dividing a system into nodes and having a team apply guide words like "no", "more", "less" to process parameters at each node to identify possible deviations from design intent. The team then analyzes the causes and consequences of deviations and recommends actions. Key aspects of a HAZOP include composing a multidisciplinary team, using guide words and parameters at study nodes, and documenting results in a report with worksheets.
[Note: This is a partial preview. To download this presentation, visit:
https://www.oeconsulting.com.sg/training-presentations]
Failure Mode & Effects Analysis (FMEA) is a step-by-step approach for identifying all possible failures in a design, a manufacturing or assembly process, or a product or service. The purpose of the FMEA is to take actions to eliminate or reduce failures, starting with the highest-priority ones. FMEA also documents current knowledge and actions about the risks of failures, for use in continuous improvement.
In this training presentation, you can teach your employees on the proper steps to construct an FMEA for a design or process, and then implement action plans to eliminate or reduce the risks of potential failures.
LEARNING OBJECTIVES
1. Understand what an FMEA is, why it is used, and when can it be deployed
2. Understand the definitions, scoring system and calculations used in an FMEA
3. Learn the steps to developing an FMEA and the pitfalls to avoid
CONTENTS
1. Introduction to FMEA
2. FMEA: Definitions, Scoring System & Calculations
3. FMEA Procedure
4. FMEA Example
This document provides an overview of Failure Mode and Effects Analysis (FMEA). FMEA is a systematic method used to evaluate potential failure modes in a design, process or service and their causes and effects. It involves analyzing potential failures, their likelihood and severity, and identifying actions to address potential failures with high risk priority numbers. The document defines key terms in FMEA like severity, occurrence, detection and risk priority number. It also outlines the FMEA process, including steps to identify potential failure modes, effects, causes, current controls and priority actions.
This document provides an overview of Fault Tree Analysis (FTA):
- FTA is a deductive failure analysis method using logic diagrams and Boolean algebra to identify the causes of failures.
- A fault tree diagram is constructed to visually show the relationship between failures and their causes.
- Probabilities are assigned to basic failures to calculate the probability of the overall undesired event occurring.
- The document outlines the steps of a FTA including defining the scope, building the fault tree structure, exploring causes in detail, solving the tree using probabilities, and making decisions based on the results.
- An example fault tree is shown for a basic circuit with a motor, battery and switch to illustrate the method.
Fault Tree Analysis (FTA) is a deductive failure analysis approach developed in 1962 to identify the causes of an undesired event. A fault tree diagram is constructed using logic symbols and gates to visually represent the relationship between failures and their causes. Probability values are assigned to basic failures to calculate the probability of the top-level event occurring. FTA is used in safety and reliability engineering to evaluate risks and improve system performance. Poka-yoke is a Japanese approach to mistake-proofing processes using simple devices that prevent or detect human errors, helping achieve zero defects. Common poka-yoke types include controls that stop machines when errors are detected and warning systems that alert operators.
Fault Tree Analysis (FTA) is a systematic method that examines a system from the top down to identify the causes of failures. It involves defining an undesired event, then resolving it into immediate and basic causes through deductive reasoning. A logical fault tree diagram is constructed using graphical symbols to show the relationships between events. FTA is used to identify weaknesses, assess reliability and safety, prioritize contributors to failure, and optimize testing and maintenance.
This document provides an overview of fault tree analysis, including its origins in 1962 for the US Air Force, how it is a graphical model of pathways leading to an undesirable loss event using logic symbols, and some key steps and rules in developing a fault tree analysis. It defines important terms like fault, failure, primary and secondary failures. It also illustrates some common logic symbols used and provides examples of potential top events to analyze.
The document discusses plant maintenance strategies and terminology. It outlines various types of maintenance including corrective, preventative, and predictive maintenance. It emphasizes the importance of aligning maintenance goals with business goals to improve processes, asset performance, and uptime. Various maintenance planning, control, and terminology are defined to effectively manage strategic assets.
Fault tree analysis (FTA) and event tree analysis (ETA) are probabilistic risk assessment techniques. [FTA] works backwards from an accident to identify causes, representing them in a logic diagram with gates and basic events. [ETA] works forwards from an initiating event through safety functions to outcomes. The document outlines the steps and uses of FTA and ETA, providing examples to illustrate fault tree and event tree construction and accident sequence description.
The document discusses Failure Mode, Effects and Criticality Analysis (FMECA) which is a step-by-step approach to identify all possible failures in a design. It defines key terms like failure modes, effects and criticality. The document outlines the phases, purpose, benefits and techniques of FMECA including hardware and functional approaches. It provides examples of applying FMECA to analyze components and recommends corrective actions to address high risks.
The document discusses Failure Mode and Effects Analysis (FMEA), a systematic method for evaluating potential failures in design, manufacturing, and production processes. It was originally developed in the 1940s for the military and is now commonly used in various industries. An FMEA involves analyzing how and how often a process might fail and classifying the failures by severity, occurrence, and detection. The analysis helps prioritize risks and identify actions needed to prevent failures.
This document provides guidance on conducting an Equipment Criticality Analysis (ECA). The ECA process identifies equipment that is most critical to business goals. It describes preparing for the analysis, including developing an equipment hierarchy and defining assessment criteria. The ECA evaluates the potential impact of equipment failure across categories like safety, quality, costs. This helps prioritize critical equipment and reliability improvement projects.
This document discusses reliability centered maintenance (RCM). RCM aims to provide required system functions with maximum reliability and availability at lowest cost. It employs various maintenance techniques like preventive maintenance, predictive testing, and repair. A key part of RCM is failure modes and effects analysis (FMEA) which identifies potential failure modes and their consequences. RCM analysis determines appropriate tasks to address failures based on probabilities and system reliability calculations. The goal is to minimize failures and costs over the system's lifecycle.
Fault tree analysis (FTA) is a deductive technique used to determine the causes of accidents or failures. It uses a graphical representation in the form of a fault tree to visually display the logical relationships between different failures or sub-events and an undesired top event. The fault tree shows how combinations of failures, events, or conditions can lead to specified hazards through different gates like AND and OR gates. FTA involves defining the top event, constructing the fault tree, validating it, and studying alternatives to recommend actions to improve system reliability.
Fault tree analysis (FTA) is a systematic approach to identify potential causes of failures using a fault tree diagram with a top-down graphical representation. The main purpose is to help identify causes of system failures before they occur. It involves identifying a top undesired event and breaking it down into intermediate events and lowest level basic causes using logic gates. FTA provides benefits like prioritizing issues, evaluating reliability, and designing tests and maintenance procedures. It should be performed to increase reliability, identify weaknesses, and calculate failure probabilities.
FMEA is a systematic method for evaluating potential failures in a design, manufacturing or assembly process. It involves analyzing possible failures, identifying their causes and effects, and prioritizing issues based on severity, occurrence, and detection. The process results in a risk priority number to determine which failures should be addressed first. FMEA is widely used in industries like automotive, aerospace, healthcare to prevent failures and improve quality and safety.
Fault Tree Analysis-Concepts and Application-Bill VeselyMassimo Talia
During the e-gate 46200 project in Logistics, i was involved in the hours of education in the study of FTA applied to the case project. This is an application of FTA in a real industrial case. This is a methodology evaluates the causes of a given undesired event.
The document discusses various maintenance strategies including reactive, preventive, predictive, proactive, and reliability centered maintenance. Reactive maintenance involves repair after failure, while preventive maintenance uses scheduled inspections and repairs. Predictive maintenance utilizes condition monitoring to detect failures before they occur. Proactive maintenance focuses on identifying and correcting abnormal causes of failure. The goal is to preserve asset functions throughout their lives in the most cost effective way.
The document discusses industrial safety. It outlines the importance of industrial safety in reducing costs for employers and employees. It then discusses causes of industrial accidents, measures to ensure safety like safety policies and committees, and methods for measuring and recording accidents. Key safety rules from the Factories Act are also summarized.
ABOUT THE TRAINING PROGRAM :-
Failure Mode and Effects Analysis or FMEA is a structured technique to analyze a process to determine shortcomings and opportunities for improvement. By assessing the severity of a potential failure, the likelihood that the failure will occur, and the chance of detecting the failure, dozens or even hundreds of potential issues can be prioritized for improvement.
DESIGNED FOR :-
Sr. Engineer, Engineer, Supervisor and Foreman engaged in maintenance, operation, Store, Supply chain, Quality, Safety and Engineering activities.
OBJECTIVE :-
Employees completing this training will be able to effectively participate on an FMEA team and can make immediate contributions to quality and productivity improvement efforts.
This document presents a case study on implementing an effective preventive maintenance (PM) scheduling system. It analyzes PM practices in a semiconductor company with 109 machines and identifies issues like inefficient scheduling and lack of prioritization of critical machines. Data on machine downtimes from January to September 2011 is collected and the highest downtime months/machines are identified. Root cause analysis finds the main causes are wear and tear from chemicals and technical issues. The document proposes clustering machines, distinguishing critical machines, integrating PM with production planning, and training technicians to help reduce downtimes and improve PM effectiveness.
The document discusses Fault Tree Analysis (FTA), a method used to analyze potential failures in complex systems. FTA uses graphical models and Boolean logic to break down potential causes of an undesired event ("top event"). The document provides an overview of FTA methodology, symbols, history of use in industries like aerospace and nuclear power, and mathematical foundations. It also gives examples of how FTA can be used to identify critical failures, optimize reliability, and assist in system design.
A Hazard and Operability (HAZOP) study is a structured technique used to identify potential problems in processes. It involves dividing a system into nodes and having a team apply guide words like "no", "more", "less" to process parameters at each node to identify possible deviations from design intent. The team then analyzes the causes and consequences of deviations and recommends actions. Key aspects of a HAZOP include composing a multidisciplinary team, using guide words and parameters at study nodes, and documenting results in a report with worksheets.
[Note: This is a partial preview. To download this presentation, visit:
https://www.oeconsulting.com.sg/training-presentations]
Failure Mode & Effects Analysis (FMEA) is a step-by-step approach for identifying all possible failures in a design, a manufacturing or assembly process, or a product or service. The purpose of the FMEA is to take actions to eliminate or reduce failures, starting with the highest-priority ones. FMEA also documents current knowledge and actions about the risks of failures, for use in continuous improvement.
In this training presentation, you can teach your employees on the proper steps to construct an FMEA for a design or process, and then implement action plans to eliminate or reduce the risks of potential failures.
LEARNING OBJECTIVES
1. Understand what an FMEA is, why it is used, and when can it be deployed
2. Understand the definitions, scoring system and calculations used in an FMEA
3. Learn the steps to developing an FMEA and the pitfalls to avoid
CONTENTS
1. Introduction to FMEA
2. FMEA: Definitions, Scoring System & Calculations
3. FMEA Procedure
4. FMEA Example
This document provides an overview of Failure Mode and Effects Analysis (FMEA). FMEA is a systematic method used to evaluate potential failure modes in a design, process or service and their causes and effects. It involves analyzing potential failures, their likelihood and severity, and identifying actions to address potential failures with high risk priority numbers. The document defines key terms in FMEA like severity, occurrence, detection and risk priority number. It also outlines the FMEA process, including steps to identify potential failure modes, effects, causes, current controls and priority actions.
This document provides an overview of Fault Tree Analysis (FTA):
- FTA is a deductive failure analysis method using logic diagrams and Boolean algebra to identify the causes of failures.
- A fault tree diagram is constructed to visually show the relationship between failures and their causes.
- Probabilities are assigned to basic failures to calculate the probability of the overall undesired event occurring.
- The document outlines the steps of a FTA including defining the scope, building the fault tree structure, exploring causes in detail, solving the tree using probabilities, and making decisions based on the results.
- An example fault tree is shown for a basic circuit with a motor, battery and switch to illustrate the method.
Fault Tree Analysis (FTA) is a deductive failure analysis approach developed in 1962 to identify the causes of an undesired event. A fault tree diagram is constructed using logic symbols and gates to visually represent the relationship between failures and their causes. Probability values are assigned to basic failures to calculate the probability of the top-level event occurring. FTA is used in safety and reliability engineering to evaluate risks and improve system performance. Poka-yoke is a Japanese approach to mistake-proofing processes using simple devices that prevent or detect human errors, helping achieve zero defects. Common poka-yoke types include controls that stop machines when errors are detected and warning systems that alert operators.
The document discusses fault tree analysis (FTA), which uses logic diagrams to identify the causes of failures in complex systems. FTA breaks down an undesired event into a logical combination of intermediate and basic events. The document provides an example of constructing a fault tree to calculate the expected frequency of injury to a steam boiler operator based on failure rates of components like water level detectors, pressure switches, and relief valves.
Fault Tree Analysis in Maintenance Principlessshoaib1
Fault Tree Analysis (FTA) is a deductive reasoning technique that uses a graphic model called a fault tree to display combinations of equipment failures and human errors that can result in an accident event. The fault tree breaks down an accident into basic causes to identify preventive measures. FTA provides a listing of minimum sets of failures sufficient to cause the event. It is used in design to uncover hidden failures and in operation to study potential accident combinations. FTA requires understanding system functions, failure modes, and probabilistic data when evaluating fault trees quantitatively.
The document summarizes an FMEA (Failure Mode and Effects Analysis) performed on a water system to improve reliability and reduce costs. Key points:
- An FMEA was conducted on the Pine Creek Canyon DWID water system in Arizona to identify failures, effects, and improvement actions.
- The FMEA addressed subsystems like electrical, water storage, treatment and distribution. It identified actions to check generator fuel levels, inspect water tanks, install alarms and establish maintenance procedures.
- The FMEA process involves describing the system, identifying potential failures and effects, current controls, risk analysis by rating severity, occurrence and detection probabilities, and calculating a risk priority number.
This document provides an overview of risk analysis. It defines key terms like risk, risk analysis, risk assessment, and risk management. It describes various qualitative and quantitative methods used for risk analysis, including hazard and operability studies, fault tree analysis, failure mode and effects analysis. The document discusses the importance of risk analysis for chemical processes and highlights some historical accidents to emphasize this. It also provides examples of applying different risk analysis methods.
Fault tree analysis (FTA) is a deductive failure analysis technique used in safety and reliability engineering. It involves defining an undesired event, understanding how the system works, constructing a fault tree diagram using logic gates to represent how lower-level failures can combine to cause the top event, evaluating the tree to understand risks and identify areas for improvement, and controlling identified hazards. FTA was originally developed in 1962 for missile systems and is now widely used in industries like aerospace, nuclear power, and process engineering.
This document discusses domino effect analysis, which predicts the occurrence and consequences of incidents that could propagate from one item to nearby items. It describes analyzing domino incidents by increasing either the consequences of an incident at a fixed frequency, or the failure frequency of an incident at fixed consequences. Two approaches are fault tree analysis and event tree analysis. The document provides examples and outlines the process of domino incident investigation and analysis.
This document presents a Failure Modes and Effects Analysis (FMEA) for power transformers. It discusses how FMEA is a systematic technique used to improve reliability by identifying potential failure modes, causes, and effects. The document outlines the FMEA process, which involves assessing the severity, occurrence, and detection of failures to calculate a risk priority number. Scaling criteria are provided for classifying severity, occurrence, and detection ratings specific to power transformers. The FMEA will list failure modes, causes, effects, and corrective actions to reduce risk.
The document discusses various reliability, availability, maintainability and safety (RAMS) concepts for avionics systems. It defines key terms like reliability, availability and maintainability. It also discusses faults, errors and failures, and distinguishes between them. Finally, it provides an overview of RAMS standards like EN50126, EN50128 and EN50129 that define processes for safety-critical systems development.
The document discusses methodology for maintenance, specifically preventive maintenance. It describes four main functions of maintenance as maintaining, keeping in existing condition, preserving, and protecting from failure or decline. Preventive maintenance is classified as either corrective or preventive. Preventive maintenance aims to prevent or mitigate failures from occurring and can be time-directed, condition-directed, or failure-finding. The document also discusses reliability centered maintenance and its features, including preserving system function over equipment. It outlines the seven-step methodology for implementing reliability centered maintenance on systems.
The document discusses Corrective and Preventative Action (CAPA) systems used to eliminate existing quality issues and prevent future problems. It defines key terms like nonconformity and describes the general CAPA process. Specific root cause analysis tools are also outlined, including 5 Whys, fishbone diagrams, Pareto charts, fault tree analysis, and failure mode and effects analysis. Each tool's purpose, methodology, advantages, and limitations are summarized. Finally, preventative action and risk management processes are covered.
This document provides an overview of fault tree analysis (FTA):
1. FTA is a graphic method to identify the causes of failures or negative events in a system. It uses deductive reasoning to break down a negative event into its potential causes.
2. An FTA diagram uses symbols like rectangles, circles, and gates to represent events and their relationships. The analysis involves defining the negative event, understanding the system, constructing the tree, validating it, and evaluating alternatives.
3. The primary benefits of FTA are the meaningful data it produces to evaluate and improve system reliability. A limitation is that all significant failure contributors must be anticipated.
Diverse Common Cause Failures in Fault Tree AnalysisJeremy Hynek
A common cause failure (CCF) is a single failure event that affects multiple components or functions of a system. Common cause failures are an important part of any reliability or hazard model, since they work to negate the improvements offered by redundancy. They are often the biggest contributors to risk levels, and should thus always be carefully considered.
For instance, the beta-factor model is a very commonly-used method, found in standards such as IEC 61508. To calculate the failure rate due to common causes, the beta factor is simply multiplied by the component failure rate. In essence, the beta factor simply represents the percentage of component failures that are due to common causes.
What activates a bug? A refinement of the Laprie terminology model.Peter Tröger
The document proposes refinements to the Laprie terminology model for describing software bugs. It introduces concepts of a fault model describing faulty code, a fault condition model describing enabling system states, and an error model describing states where faults are activated and may lead to failures. A failure automaton is presented with states for disabled, dormant, and active faults, as well as detected errors and outages. Events are defined for when fault conditions are fulfilled or no longer fulfilled, faulty code is executed, and failures occur. The refinement aims to separately consider investigated software layers and their environment in order to better describe what activates bugs.
This document provides an overview of Failure Modes and Effects Analysis (FMEA) and Hazard and Operability Studies (HAZOP). It defines FMEA as a systematic technique used to identify potential failure modes in a system and assess their effects. The document outlines the FMEA methodology, including defining the system, identifying failure modes and their causes/effects, and reporting. It also introduces FMEA applications and benefits. HAZOP is defined as a technique used to identify hazards and operability problems to assess the consequences of potential deviations from the intended process design or operation. The document explains the purpose of both FMEA and HAZOP is to improve process safety.
This document discusses process variation and quality tools. It begins by defining process variation as inevitable changes in a system's output over time. Common and special causes of variation are described. Several process performance metrics are then defined, such as percentage defective and defects per million opportunities. The document also discusses outliers, Cp, Cpk, and examples of calculating these metrics.
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8. Fault Tree Analysis (FTA) is one of the most
important logic and probabilistic techniques
used in Probabilistic Risk Assessment (PRA)
and system reliability assessment.
Fault Tree Analysis (FTA) attempts to model
and analyze failure processes of engineering
systems. FTA can be simply described as an
analytical technique
9. FTA is a deductive analysis approach for
resolving an undesired event into its causes.
Logic diagrams and Boolean Algebra are used
to identify the cause of the top event.
10. Fault tree is the logical model of the relationship
of the undesired event to more basic events.
The top event of the Fault tree is the undesired
event.
The middle events are intermediate events and
the basic events are at the bottom.
The logic relationship of events are shown by
logic symbols or gates.
11.
12.
13.
14. A primary fault is any fault of a component that occurs in
an environment for which the component is qualified e.g.,
a pressure tank, designed to withstand pressures up to and
including a pressure Po, ruptures at some pressure p <Po
because of a defective weld.
A secondary fault is any fault of a component that occurs
in an environment for which it has not been qualified. In
other words, the component fails in a situation which
exceeds the conditions for which it was designed; e.g., a
pressure tank, designed to withstand pressure up to and
including a pressure Po, ruptures under a pressure p > PO.
Because primary and secondary faults are generally
component failures, they are usually called primary and
secondary failures. A command fault in contrast, involves
the proper operation of a component but at the wrong
time or in the wrong place;
15. Basic Event: A lower most event that can not be further
developed.
Intermediate Event: This can be a intermediate
event (or) a top event. They are a result logical combination
of lower level events.
Undeveloped Event: An event which has
scope for further development but not done
usually because of insufficient data.
External Event: An event external to the
system which can cause failure.
16. OR Gate: Either one of the bottom event
results in the occurrence of the top event.
AND Gate: For the top event to occur all the
bottom events should occur.
Inhibit Gate: The top event occurs
only if the bottom event occurs and
the inhibit condition is true.
17. Procedure for Fault Tree Analysis
Define TOP
event
Define overall
structure.
Explore each
branch in
successive level
of detail.
Solve the fault
tree
Perform
corrections if
required and
make decisions
18. 1. Define the undesired event to be
analyzed (the focus of the FTA)
2. Define the boundary of the system (the
scope of the FTA)
3. Define the basic causal events to be
considered (the resolution of the FTA)
4. Define the initial state of the system
19.
20. • Undesired top event: Motor does not start
when switch is closed
• Boundary of the FT: The circuit
containing the motor, battery, and switch
• Resolution of the FT: The basic
components in the circuit excluding the
wiring
• Initial State of System: Switch open,
normal operating conditions
21.
22.
23.
24. • The top event should describe WHAT the
event is and WHEN it happens
• The top event is often a system failure
but can be any other event
• The top event is the specific event to be
resolved into its basic causes
• Defining the wrong top event will result in
wrong assessments and conclusions
25. 1. Define the top event as a rectangle
2. Determine the immediate necessary and
sufficient events which result in the top event
3. Draw the appropriate gate to describe the logic
for the intermediate events resulting in the top
event
4. Treat each intermediate event as an
intermediate level top event
5. Determine the immediate, necessary and
sufficient causes for each intermediate event
6. Determine the appropriate gate and continue
the process
26. The system being analyzed for the
undesired event needs to be studied and
understood before the fault tree is
constructed
If an electrical or hydraulic system is being
analyzed, the fault tree is constructed by
tracing the causes upstream in the circuit
to the basic causes
For a generalized network or flow, the
fault tree is similarly constructed by
upstream tracing of the causes
27. Top Event- What specific event is being analyzed?
Boundary- What is inside and outside the analysis?
Resolution- What are the primary causes to be
resolved to?
Initial State- What is assumed for the initial conditions
and states?
28. Do not assume abnormal conditions will
occur to prevent a fault from propagating
In particular, do not assume a failure of
another component will occur to prevent a
fault from propagating
29. Each Gate and Event on the Fault Tree
needs to be named
The Name should ideally identify the Event
Fault and the What and When Conditions
Basic events should in particular be named
to identify the failure mode
What is important is that the same event
be given the same name if it appears at
different locations
30. Human errors are classified into two basic types-errors
of omission and errors of commission
An error of omission is not doing a correct action
An error of commission is doing an incorrect action
Human errors are modeled as basic events in a FT,
similarly to component failures
Human errors need to be considered whenever a
human interfaces with the component or system
The failure modes need to be expanded to include
failure induced by the human
31. Test and maintenance related errors
Errors causing initiating events
Procedural errors during an incident or
accident
Errors leading to inappropriate actions
Detection and Recovery errors
32.
33.
34. • The system operates in different phases
• The system configuration can change in different
phases
• The system success criteria can change
• The basic event probabilities (e.g, component failure
rates) can change
35. For each phase there are distinct basic event
probabilities but no system logic changes
Each basic event is thus resolved into individual
phase events
36. Changes in event probabilities can alternatively be
handled in the quantification stage
37. A minimal cutset (mcs) is a smallest combination of
primary events, or basic events, causing the top
event
All the primary events need to occur to cause the
top event
Each mcs is thus a causal-combination, i.e., a
combination of primary events
The complete set of mcs provides the complete set
of causes of the top event
38. The fault tree is represented as a set of logic equations
Substitution is carried out until the top event is
represented entirely in terms of basic events
The top event equation is then expanded and
simplified to obtain a ‘sum of products’
In expanding the top event equation, the Boolean
distributive law and the law of absorption are used
Each product in the sum of products is then a
minimal cut set of the top event
39. A•(B + C) = A•B + A•C Distributive Law
A + A = A Identity Union Law
(Identity Absorption Law)
A + A•B = A Subset Absorption Law
A•A = A Identity Intersection Law
(Idempotent Law)
(A + B)’= A’•B’ Union Complementation Law
(A•B)’= A’ + B’ Intersection Complementation
40.
41. Applying the Distributive Law and Laws of Absorption to the Top
Event Equation in terms of the Basic Events
Q =C1 OR C2
C1=B1 OR B2
C2= B2 oR B3
Q =(B1+B2) •(B2+B3)
Q =(B1 •B2)+(B1•B3)+(B2•B2)+(B2•B3)
Q =(B1 •B2)+(B1•B3)+B2+(B2•B3)
42. Failure probability for a non-repairable
component (or event)
P = 1-exp(-λT) ~ λT λ = component failure rate
T = exposure time
Failure probability for a repairable component
P = λτ/(1+ λτ) ~ λτ τ = repair time
Constant failure probability for a component
P = c c = constant probability
43. 1. Identify the specific component failure mode
2. Determine whether the failure is time-related or
demand related
3. Determine the environment e.g., ground or air
4. Select the appropriate failure rate value
5. For a time-related failure determine the exposure
time
6. For a time-related failure, if the failure is repairable
determine the repair time
7. For a demand-related failure, determine the number of
demands if greater than 1
44. FV Importance (Contribution Importance)- the
relative contribution to the top event
probability from an event.
Risk Achievement Worth RAW (Increase
Sensitivity,Birnbaum Importance)- the increase
in the top event probability when an event is
given to occur
Risk Reduction Worth RRW (Reduction
Sensitivity)- the reduction in the probability of
the top event when an event is given to not
occur
45. FV Importance = Sum of min cut cuts containing the event
Sum of all min cut sets
RAW =Top event probability with event probability set to 1
RRW = Top event probability with event probability set to 0
46. A Success Tree (ST) identifies all the ways in
which the top event cannot occur
The ST is the complement of the FT
The ST is the mirror of the FT
The ST is useful in showing the explicit ways to
prevent the occurrence of the FT
47. Complement the top event to a NOT event
Complement all intermediate events to NOT
Events
Complement all basic events to NOT events
Change all AND gates to OR gates
Change all OR gates to AND gates
The minimal cut sets of the ST are now called the
minimal path sets
48. A minimal path set is the smallest number of
events which if they all do not occur then the
top event will not occur
If the events in one path set are prevented to
occur then the top event will be guaranteed
to not occur
The minimal path sets are the totality of
ways to prevent the top event based on the
fault tree
49. Define the FTA
– Top Event
– Scope
– Resolution
Assemble the project Team
– FT analyst
– System engineering support
– Data support
– Software support
Define the FTA Operational Framework
– Assemble the as built drawings
– FT naming scheme
– Interfaces/Support to be modeled
– Software to be used
50. Assemble the data
– Generically applicable data
– Specifically applicable data
Prepare the software package
– Familiarization
– Test problems
Keep a log on the FTA work
– Operational and design assumptions
– Events not modeled and why
– Success and failure definitions
– Special models and quantifications used
51. Review the work at stages
– FT construction
– Qualitative evaluations
– Quantitative evaluations
Check and validate the results
– Engineering logic checks
– Consistency checks with experience
Prepare and disseminate the draft report
– Conclusions/findings
– FTA results
– FTs
– Software inputs/outputs
Obtain feedback and modify and final report
– Disseminate the report
– Present findings
52.
53. 1) “Fault Tree Handbook with Aerospace Applications’
Version 1.1, NASA Publication, August 2002
2) Fault Tree Analysis (FTA) ,Concepts and Applications
Bill Vesely,NASA HQ
3)Tutorial fault tree analysis
Dr John Andrews,1998
3) Fault tree analysis,4ᵀᴴEdition P.L.Clemens1993
4) Fault tree analysis,Clifton A.Ericson II
5) Fault Tree Handbook with Aerospace Applications
Version 1.1, Prepared for NASA Office of Safety and
Mission Assurance, NASA Headquarters
Washington DC 20546 , August 2002