AB. The International Marine Contractors Association. Guidance on. Failure Modes & Effects Analyses (FMEAs). IMCA M April AB. IMCA M, Guidelines for Failure Modes and Effects Analyses (FMEA). • IMCA M, FMEA Management. • IMO MSC Circular , Guidelines for Vessels with . IMCA M “Guidance on Failure Modes and Effects Analysis” o. IMCA M “ FMEA Management Guide”. 2 Unless expressly stated in this Guidance document.
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Failure Mode Effects A Failure Mode and Effec Failure Mode and E Design Failure Mode an An Automated Failure M IMCA promotes improvements in quality, health, safety, environmental and technical standards through the publication of information notes, codes of practice and by other appropriate means. Members are self-regulating through the adoption of IMCA guidelines as appropriate. They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients.
There are two core committees that relate to all members: It is intended to review the guidance and make any necessary improvements on a regular basis. Any person with suggested improvements is invited to forward these to IMCA. It does not attempt to give comprehensive answers to the frequently answered questions FAQswhich are addressed in the main document. An FMEA can be applied to any item, system or process that could fail.
A systematic analysis of the systems to whatever level of detail is required to demonstrate that no single failure will cause an undesired event. What are its objectives? To identify potential design and process failures before they occur and to minimise the risk of failure by either proposing design changes or, if these cannot be formulated, proposing operational procedures.
Essentially the FMEA is to: Identify the equipment or subsystem, mode of operation and the equipment;? Identify potential failure modes and their causes;? Evaluate the effects on the system of each failure mode;? Identify measures for eliminating or reducing the risks associated with each failure mode;?
Identify trials and testing necessary to prove the conclusions; and?
Provide information to the operators and maintainers so that they understand the capabilities and limitations of the system to achieve best performance. What does it contain? The report will be structured to outline the findings that have been developed from worksheets. The findings will concentrate on the failure modes found which would have significant inca on the system and grade them into categories, e. Imcs FMEA should contain a practical test programme and the results from those tests.
What practical tests are required? During the course of the analysis, there will be failure modes that are difficult to assess, so during the analysis a series of tests are devised to assess those failure modes in practice. Many types of failure mode have been revealed during an FMEA. Numerous examples are given later in this document. What is criticality analysis? Risk is a measurement of the combination of the consequence of a failure mode and its probability of occurrence.
The results of the risk assessment can be prioritised to indicate high risk failure modes that should receive risk reduction considerations. WHY Who wants one and why do they want one?
DP Documents Revised, Published by IMCA
It is both common sense and responsible design practice to carry out an FMEA on an item of equipment or a system whenever it is required to work in an environment where any failure mode has the potential for a catastrophic effect on the process.
The organisations and persons who want an FMEA may include: Charterers – who will require an FMEA so that they can have confidence that the vessel is fit for purpose. An appropriate FMEA will give an enhanced comfort factor that the operation will be performed without problem or risk.
Operators — who require an FMEA so that procedures can be developed to mitigate the effects of any failure modes. Maintenance staff — who require an FMEA so that any critical areas which could give rise to a serious problem in the event of a failure can be targeted by planned maintenance techniques during periods of downtime.
If the vessel is in the process of design or construction, then the detailed FMEA should run in parallel with the design process, with any FMEA testing deemed necessary being integrated into the shipyard sea trials programme. If the vessel is an existing vessel then the FMEA can be carried out at any time though the FMEA tests will require to be programmed during a convenient period of downtime. Selecting the team Nominating the required specialists?
Defining the reporting procedures e. Defining the boundaries of the system to be analysed The benefit of block diagrams. These break the DP system down from a high system level to lower system levels to give a graphic representation of how each system level interacts with another. The intention is, essentially, mm166 confirm failure modes and not test the whole system for correct installation. FMEA report structure Formulation of report template. How is the FMEA presented?
This document j166 guidance on what form the FMEA deliverables should take. M166 often should the FMEA be updated?
Ijca FMEA should grow and mature with the life of the vessel. Failure Probability Determination — Qualitative and Quantative?
RAM Reliability and Maintainability? An FMEA is an easy to use yet powerful pro-active engineering quality tool that assists in the identification and countering of weak points in the early design phase of products and processes. Finally, the additions to the FMEA process, which can compliment the analysis, are briefly explored. When progressing through this document, it should be remembered that the FMEA process itself is not sufficient to ensure a meaningful analysis.
It is a tool to assist kmca carrying out a job. A tool in the hands of an inexperienced craftsman will not produce a good product and so it is with an FMEA. An analyst expert in the use of FMEAs and fully conversant in the architecture and operation of the system or process to be analysed, is essential to ensure a good final product.
Guidance on failure modes and effects analysis (FMEA)
Each question and answer is intended to be a brief idea of the type of question raised relating to FMEAs and, in most cases, the answer will lead the reader on to more in-depth discussion in a later Chapter. Each FAQ will be cross-referenced to sections later in the report where relevant. What is an FMEA? An FMEA is a design tool that has been around for many years and is recognised as an essential function in design from concept through to the development of every conceivable type of equipment.
FMEA procedures are based on standards in the reliability engineering industry, both military and commercial. The fundamental purpose of an FMEA is to prove that the worst case failure in practice does not exceed that stated by the designers in the functional design specification.
Where DP is concerned, the objective is to develop a fault tolerant system that can not only hold station in the face of adverse circumstances, but allows faults to be corrected as they occur, without jeopardy to the operation at hand. Refer to Chapter 2 Section 2. The scope of the FMEA should be established at the outset. In the case of a DP vessel, it should encompass all those parts of the system involved in stationkeeping, e. DP control system, power generation and distribution, power management, thrusters and propulsion, DP environment and position sensors.
Case study – Load sharing imbalance caused loss of position – IMCA
The findings will concentrate on the failure modes found, which umca have significant effects on the station keeping ability of the vessel and are graded into categories, e. It should contain a practical test programme, which, in the case of a DP vessel, is carried out mainly at sea when in full DP mode, together with the test results.
Who wants an FMEA and why? Whenever the function of an item of equipment or system is for it to work in i,ca environment in which any failure mode has the potential for a catastrophic effect on the process, it is common sense and responsible design practice to carry out an FMEA. Consequently, a number of people, organisations, bodies, etc.
IMCAM Guidance on Failure Mode & Effect Analysis (FMEA)_图文_百度文库
National regulatory authorities, who often require an FMEA as part of the safety case for an offshore installation or DP vessel. Charterers, who will require an FMEA as part of the vessel acceptance criteria so that they can have confidence that the vessel is fit for purpose. A thorough FMEA will give an enhanced comfort m1166 that the operation will be performed with the minimum of disruption.
Owners, who require an FMEA to satisfy a charterer. It is also common sense for an Owner to have a thorough FMEA carried out on his vessels as it provides him the assurance that any risk has been minimised, if not eliminated. Operators, who require an FMEA so that procedures can be developed to mitigate the effects of any failure modes. The FMEA will assist in development of the operations manuals and training programmes.
Maintenance staff, who require an Lmca so that any critical areas which could give rise to a serious problem in the event of a failure can be targetted by planned maintenance techniques during periods of downtime.
Refer to Chapter 3 Section 3. Ideally, the FMEA should be initiated at as early a stage in the design process as possible, and then run in parallel with the design phase. Where DP is concerned, on new builds and conversions, the vessel owner or yard typically contracts for the study near the end of the vessel construction or conversion phase with the objective of identifying any single point failures. For maximum benefit, the time to identify and eliminate or mitigate the effect of equipment failure is during the design process, not in the latter stages of vessel construction or conversion.
Access will be required, to all documentation relating to the DP system, i. DP control system, electrical systems, machinery systems, machinery control systems, and all the equipment necessary to maintain the vessel on station. A physical inspection may also be necessary and access to the vessel will have to be arranged.
An FMEA team should be gathered together, which includes specialists each having a discipline in each of the systems required in the design process, e. It is also likely m1166 access to specialist advice from naval architects and operations personnel will be required. Refer to Chapter 5 Section 5. There are a number of standards to which an FMEA can be carried out.
The inca of standards is important so that the FMEA will be accepted by all parties interested in it. Using a common standard for an FMEA has other benefits; such as the customer gets a report to a consistent standard and the companies bidding to carry out FMEA will also benefit because they will have a level playing field Standards include: Guide to failure modes, effects and criticality analysis.