FMEA/FMECA detection

FMEA/FMECA Detection and Risk Priority Number 2.2.1 Detection... 

Since in FMEA/FMECA corrective action and risk ranking are done on the basis of RPN, which is a product of severity, occurrence, and detection, it is possible that risk with less severity may get more priority (through RPN) than risk with more severity. 

RPN This is expressed in FMEA/FMECA in terms of product of severity, occurrence, and detection ranking in the scale of 0—1000. 

Detection is related to causes of failure and controls, as shown in Fig. IV/2.1-1. Thus there are two ways to look at it preventive and detection control. In prevention, with the help of existing controls, failure modes are prevented, whereas the other way detects the failure and takes corrective action before it reaches the customer (see Fig. IV/2.2.1-1). FMEA/FMECA identifies the method by which occurrence of failures/failure modes is detected by the operating personnel. Audio... 

FMECA is a more detailed version of the FMEA. FMECA requires that more information be obtained from the analysis, particularly information dealing with the detection methods for the potential failure modes and the reliability-oriented risk priority number (RPN), where RPN = Likelihood of Failure x Failure Effect Severity x Likelihood of Failure Detection. 

FMEA is a prospective hazard analysis technique which is widely used in many domains and increasingly in the service industries [4]. The methodology has its origins in military systems and the aerospace industry in the 1960s. Subsequently the automotive and chemical engineering sectors adopted the tool - indeed in some regulated industries application of the technique is now mandatory. The objective of the tool is to identify what in a product can fail, how it can fail, whether failure can be detected and the impact that will have. The technique can be supplanented with a Criticality Analysis which takes into account the severity of the failure. When this extension is employed, the technique is often called FMECA. 

The FMECA requires more information be obtained than an FMEA, particularly information dealing with the criticality and detection of the potential failure modes. 

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