What software or methodology do you use to assess (risk, benefit) of your modification in plant?

[bboosstteerr]

Dear all,

Supposes you already improved/modified some equipment, then how do you assess the risk or the benefit for the overall system/plant? any references thank you.

 

[GregLocock]

Risk? FMEA if we're feeling posh. Doesn't need software. Does need common sense.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[dgallup]

We usually do the PFMEA upfront before the change then look at Cpk afterwards to assess the benefit. Only software is MS Access & Excel.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[BrianPetersen]

A table in your favorite document editing software (whatever that might be, we use LibreOffice), plus the relevant standards in front of you, plus a healthy dose of common sense and experience.

 

[bboosstteerr]

how effective for you doing PFMEA sir ?

 

[ornerynorsk]

As others have mentioned, it's not so much the software, you can take legible hand-written notes and it's just as legitimate, but it boils down to the meat of the discussion of the professionals sitting down and discussing what could go wrong and who/what will be affected by those failures (or misuse). It should be thorough, but realistic. You are the one that needs to determine how far down the chain that needs to be assessed, IE single fault, etc.

Looking at your original question again, are you asking about true risk analysis and risk management, or is it simply a bullet-point list of pro's and con's to justify an update?

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[rb1957]

are you talking about a cost/benefit study, or a trade study ? these are different to FMEA (which essentially the probability of failure of the system)

a cost/benefit study is straight forward, no? if not, look up examples.

another day in paradise, or is paradise one day closer ?

 

[GregLocock]

A sensibly done FMEA can be very useful. A badly done FMEA is a waste of everybody's time. Note that a good FMEA does not have to be complete, because some FM are obviously inconsequential so you don't need to complete the table for them. That is, you should work across the table rather than down it.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[rb1957]

surely anything badly done is a waste of time ?

another day in paradise, or is paradise one day closer ?

 

[bboosstteerr]

I mean how true/close the estimation from doing such analysis for the cost and risk

 

[rb1957]

the resulting accuracy of an analysis for cost/risk is the same as any other analysis ... as good as the input data ! One way to improve things is to do a sensitivity study on the inputs ... which affects the answer more ? Maybe look into how insurance companies assess risk ?? (I mane they make money out of risk, so they've got to know something about it). or project management (managing risks).

another day in paradise, or is paradise one day closer ?

 

[bboosstteerr]

do you have any books recommendations sir that you would say a must have?

 

[rb1957]

simply put, no.

it's help others to know more about what you're trying to do. You've asked a very general question. Are you interested in risk (ie damage and costs associated) or RoI (return on investment) ? Are you embarking on a change, or trying to justify (or undermine) a previous change ? Has you company done similar changes before, or is this a shot in the dark ?

Have you done a simple google search (for say "cost benefit analysis") ? Then ask us which of the promising hits we'd recommend.

another day in paradise, or is paradise one day closer ?

 

[bboosstteerr]

ok thank you sir sorry for my vague question i'll try to refine the next question.

 

[rb1957]

"do or do not, there is no try"

another day in paradise, or is paradise one day closer ?