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  FMEA and Control Plans
  FMEA Severity Ranking

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Author Topic:   FMEA Severity Ranking
mike852
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posted 28 June 2001 09:50 AM           Edit/Delete Message   Reply w/Quote
General Question - for ranking severity, the only difference between a 9 and a 10 is, a 9 is with warning and a 10 is without warning. Does warning include operator notification that the process he/she is performing may be "hazardous" or, does the process have to signal some type of warning that a failure is about to occurr, say a flashing light or horn sounding. Also, does process failure warning include a part that fails in steps? For example, an operator pressurizes a pipe, and the pipe starts to hiss (which warns the operator) before it explodes, versus, the pipe is pressurized and then explodes without any warning (no hissing)? Any clarification on this issue is greatly appreciated.

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Al Dyer
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Posts: 814
From:Lapeer, MI USA
Registered: Oct 2000

posted 28 June 2001 11:57 AM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
Mike,

You have valid questions but the value of the ratings are very subjective. There is no right or wrong ranking system, the supplier defines what the ranking system is based on the specific product or process.

The tables in the AIAG FMEA manual are only "suggested" evaluation criteria.

Hope this helps a bit.

ASD...

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