fmeca Risk analysis


FMECA - risk analysis

DEFINITION OF FMECA METHOD:

FMECA (Fault Modes, Effects and Criticality Analysis) is an analysis of fail safety carried out on the base of qualitative evaluation of the types of failures which can exist in each part of the project, determination of effects of each failure on a different part of the project and on the required functions of a subject, and analyzing the criticality factor of potential failures of the subjects.

Note: as a failure is meant an subject condition, characterized by inability to meet required function except of an inability during preventive maintenance or any other scheduled activities, or caused by an insufficiency of external factors

CHARACTERISTICS OF FMECA METHOD:

The types of all the potential failures connected with each part of analyzed system, which might have been caused by any factor, are estimated and an importance of every failure is determined, so the future functions can be performed reliably and with no failures.

We use a induction approach to solve the problem (from the simplest parts of analyzed system towards to the superior systems).

The FMECA method, in the comparison with an intuitive approach of the constructor when his/her experiences are considered and advantage is taken of them, has these features:

	It significantly limits the number of not detected types of failure on the lowest level of the analysis
	It takes an advantage of a team work, which helps to consider the opinions of the participating experts in an objective way and so it limits the mistakes in an estimate and allows to expand potential point of views on the occurrence of failures
	It expects a systematic management of required documentation and so it minimizes a risk that some of the relevant information for the given component will be forgotten to inspect and evaluate.

ADVANTAGES OF FMECA METHOD:

	This method has a wide variety of usage in any special purpose application. Every stage of lifecycle of an analyzed system from the stage of development (every time, when the development of a products requires a new decision about further line of actions or in cases which require evaluation of effects of suggested changes) to the stage of operation.
	It is considered as a very effective measure for proving a sufficient level of fail safety and for proving a supplier-guaranteed safety of an analyzed system to the client
	The whole procedure can be formalized into one simple procedure form
	The precautions are ensured with firmly stated person who is responsible for their realization
	Relatively low importance of knowledge of the workers, who participate in the analysis, with regard to a result reliability

It is necessary to implement a feedback ( behavior of analyzed system ) in particular stages of system lifecycle to verify the results given by the FMECA method. When realizating this feedback, we are able to provide these services:

	Observation of the failuresafety and archivation of information obtained during installation, shipping inspection and the operation itself
	Continuous evaluation of information obtained from operation and its comparison with set requirements for a failuresafety of analyzed system
	Potential carrying out of precautions when some incongruency occurs during the life span of the analyzed system