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Development of Modified Evaluation and Prioritization of Risk Priority Number in FMEA
N Sellappan, K. Palanikumar
Pages - 32 - 43 | Revised - 05-04-2013 | Published - 30-04-2013
Published in International Journal of Engineering (IJE)
MORE INFORMATION
KEYWORDS
Failure Modes, Risk Factors, Risk Priority Number, Risk Prioritization, Statistical Analysis
ABSTRACT
Failure Mode and Effects Analysis (FMEA) is a tool used for identifying, analyzing and prioritizing
failure modes of a product and process. The traditional FMEA determines the risk priority of each
failure mode using the risk priority number (RPN) by multiplying the ranks of the three risk factors
namely the Severity (S), Occurrence (O) and Detection (D). FMEA is carried out by a team of
members and the critical problem is that the team often demonstrates different opinions from one
member to another. Then, there is a disagreement in ranking value for the three risk factors. In
case average out of difference is considered, the different combination of three risk factors may
produce an identical RPN value for different failure modes. In the present work, the modified RPN
prioritization method is introduced into traditional FMEA to solve the above issue and this method
is applied in the risk evaluation of water leakage in the building. Finally, the proposed method has
been evaluated using statistical analysis techniques. The result indicates that the proposed
method is useful for RPN evaluation and prioritization of failure modes.
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Mr. N Sellappan
Salalah College of Technology - Oman
sanov18@yahoo.com
Dr. K. Palanikumar
Sri Sai Ram Institute of Technology - India
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