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PFMEA Severity - What is Process FMEA Severity estimation based on?

  • Thread starter Matthew_Hopkins
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Chennaiite

Never-say-die
Trusted
#71
Re: Severity estimation in a PFMEA is a bit confusing

Dear All,

Can anyone give a better clarity in addressing the effects ?

My understanding is , if a failure is detected, on the inhouse effect we should indicate whether to sort or rework or scrap. Should we also consider the detection here?
You may wish to read Suggested Evaluation criteria for Severity rating mentioned in AIAG Manual (Page 88). It speaks about 'Customer effect' which is applicable to End user and also 'Manufacturing/Assembly effect' which could be applied to your immediate Customer's as well as your inhouse production process.


If certain defects are not noted by customer can we indicate no effect or what should we indicate?
If Customer's process is not capable of detecting a particular defect supplied, you can consider 'No effect' at your Customer end, provided it does not result in unsafe Customer operation.
 
P

praveenraaaj

#72
Re: Severity estimation in a PFMEA is a bit confusing

You may wish to read Suggested Evaluation criteria for Severity rating mentioned in AIAG Manual (Page 88). It speaks about 'Customer effect' which is applicable to End user and also 'Manufacturing/Assembly effect' which could be applied to your immediate Customer's as well as your inhouse production process.




If Customer's process is not capable of detecting a particular defect supplied, you can consider 'No effect' at your Customer end, provided it does not result in unsafe Customer operation.
Thanks for your reply.

But I still have ambiguity even after reading, should we also consider the inhouse effects if the problem occurs or detected at some point ?

Can we indicate NO EFFECT for customer and End user if it has no unsafe operation but only possibility reduced performance or inconvenience but cannot be detected by them?

Thanks !
 
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Jim Wynne

Super Moderator
#73
Re: Severity estimation in a PFMEA is a bit confusing

Thanks for your reply.

But I still have ambiguity even after reading, should we also consider the inhouse effects if the problem occurs or detected at some point ?
If a problem caused by your process creates a problem for your customer or the end user, it will undoubtedly cause a problem for your company.

Can we indicate NO EFFECT for customer and End user if it has no unsafe operation but only possibility reduced performance or inconvenience but cannot be detected by them?
If the product creates a problem for your customer or the end user, it will create a problem for you and your customer. The fact that your customer might not detect the issue before releasing the product doesn't mean that the problem doesn't exist.
 

Chennaiite

Never-say-die
Trusted
#74
Re: Severity estimation in a PFMEA is a bit confusing

In addition to Jim's

But I still have ambiguity even after reading, should we also consider the inhouse effects if the problem occurs or detected at some point ?
Yes. The effect of the problem inhouse might be like reduced production volumes, high scrap rate, rework, etc.

Can we indicate NO EFFECT for customer and End user if it has no unsafe operation but only possibility reduced performance or inconvenience but cannot be detected by them?
Reduced Performance and Inconvenience are detectable certainly by the end user, may be not by your next tier Customer. Therefore, 'no effect' for end user is ruled out.
 

Helmut Jilling

Auditor / Consultant
#76
I read all threads in this post and am confused further :frust:

So would Severity in PFMEA be based on Process / End user ?
If you read in the AIAG FMEA manual (this is an automotive guidebook in the USA automotive industry), it shows a table for Severity for PFMEA. The table has a column for the process and customer, and one column for the end user. You select an answer from both columns, and use the higher number of the two scores. So, it is based on both, whichever is higher, on each risk item.
 
M

mraroldis

#77
Re: PFMEA Severity - What is Process FMEA Severity estimation based on

Hello All

How could be estimate in a proper way Severity from 2nd. Party or 3rd. Party Supplier?

Can be estimate Severity (2nd. & 3rd. Party Supplier) less than 1st. Party Supplier?

This is in order that 3rd. Party Supplier send its finished product to 2nd. Party Supplier and this to 1st. Party Supplier and then to Auto Maker.

Example: FORD (Auto Maker)

Supplier 1st. Party: Alternator Maker (Auto Component)
Supplier 2nd.Party: Bearing Maker (Alternator Component)
Supplier 3rd Party: Plastics (Bearing Component)
 

Helmut Jilling

Auditor / Consultant
#78
Re: PFMEA Severity - What is Process FMEA Severity estimation based on

Hello All

How could be estimate in a proper way Severity from 2nd. Party or 3rd. Party Supplier?

Can be estimate Severity (2nd. & 3rd. Party Supplier) less than 1st. Party Supplier?

This is in order that 3rd. Party Supplier send its finished product to 2nd. Party Supplier and this to 1st. Party Supplier and then to Auto Maker.

Example: FORD (Auto Maker)

Supplier 1st. Party: Alternator Maker (Auto Component)
Supplier 2nd.Party: Bearing Maker (Alternator Component)
Supplier 3rd Party: Plastics (Bearing Component)
If you are looking at a PFMEA, Severity looks at the impact on the process and the product. Whether you are at tier 1 or tier 3, the Severity can be the same. It is the final impact on the product and the process.
 
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