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Anexas a consulting organization based in Denmark with wide presence in India and offices in UAE, Kingdom of Saudi Arabia, Singapore and Canada. Anexas group comprises of Anexas Denmark in Europe, Anexas FZE in UAE, Anexas Consultancy Pvt ltd in India and Anexas Consulting in Middle East, Soon all over the world.

 

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Failure Modes And Effects Analysis

Failure Modes And Effects Analysis

Introduction :

Failure Mode and Effects Analysis (FMEA) is an essential part of any product design or redesign activity. FMEA is a proactive, quantitative, qualitative, step-by-step approach for identifying and analyzing all potential points of failure in any product or service. This team-based activity can dramatically improve product performance. It can also reduce manufacturing issues at the component, system, and processing level.

  • When a process, product or service is being designed or redesigned, after quality function deployment.
  • When an existing process, product or service is being applied in a new way.
  • Before developing control plans for a new or modified process.
  • When improvement goals are planned for an existing process, product or service.
  • When analyzing failures of an existing process, product or service.
  • Periodically throughout the life of the process, product or service

An FMEA (Failure Modes and Effects Analysis) is a quality improvement tool that helps focus on and understand potential process or product risks. During the course of an FMEA study, potential risks are identified and prioritized and used to develop action plans to reduce the risks associated with the product or process under study.

An FMEA should be performed by a team, NOT one individual. The team should include representatives of all of the functions impacting the product or the process under study. The best size for an FMEA team is 4 to 6 people. It’s difficult to successfully conduct an FMEA study with less than 3 people and more than 6 might bog the process down.

Conducting an FMEA involves a systematic step-by-step approach using a standardized FMEA Worksheet (form) to collect information on (product or process) components, their corresponding functions and potential failure modes. The risk level of those potential failures is then prioritized using a relative ranking scale. Action plans for unacceptable risks are developed. After action plans have been completed, risk levels are reevaluated to ensure the action taken was successful in reducing the risk to an acceptable level.

The time it takes to conduct an FMEA study depends on the scope of the study and the level of preparation done. With a well-defined and “reasonable” scope coupled with a comprehensive set of (organization-specific) customized ranking scales, a team can competed an FMEA study (up to the point of identifying action plans to be developed) in hours. Conversely, if the scope is “too” broad and if custom ranking scales have not been developed, the study may take several days.

A DFMEA (Design-FMEA) involves a study of a specific product. A PFMEA (Process-FMEA) is the study of a process that may produce products or provide a service. While the principles and strategy of a DFMEA and a PFMEA are essentially the same, the tactics used in some of the steps will differ somewhat. A primary objective of a DFMEA is to uncover potential failures associated with the product such as those that could cause product malfunctions, a shortened product life or a safety hazard while using the product. PFMEAs are used to uncover process problems related to the manufacture of a product or a series of products. When conducting a PFMEA, you need to think about how failures from the many process inputs or causes can affect process outputs such as product quality, processing efficiency and safety.

It is best to conduct an FMEA on a new product or process right in the preliminary design stage. Revisit the FMEA during the product prototype or process pilot phase. Then use the FMEA to evaluate potential risks associated with the final design or as-built process. And finally, revisit the FMEA whenever a product or process has been changed.

The outcome of an FMEA can only be as “good as the team.” If the team does not fully understand potential failures that may occur or corresponding effects of potential failures, related risks will not be recognized. Similarly, if a team does not take the time to drill down into the details of a product design or process, critical risks may be overlooked.

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