Maintworld 4/2016

MW Vertical Ad.pdf 1 9/7/2016 9:39:56 AM
MW Vertical Ad.pdf 1 9/7/2016 9:39:56 AM
MW Vertical Ad.pdf 1 9/7/2016 9:39:56 AM
Ranking Detectability
While we could come up with a similar ranking process, we
recommend you keep it simple and attempt to record the
likelihood (as a percentage) that the onset of failure will be
detected. A score of 100 percent would mean you are absolutely
sure you will detect the fault conditions. Zero percent
means you will have no warning at all, not even from local
operators.
Ranking the Consequence of Failure
This is where it gets a bit tricky. We could simply define a
score of between 1 and 5 that ranked the consequence, for
example. insignificant, minor, moderate, major, and extreme.
But you need a better definition.
Instead, the author would recommend that you define
consequence of failure from different viewpoints: maintenance,
plant safety, impact on production, impact on the
environment, and quality (which could include impact on
customers). You may have other areas that concern you, and
you could include other consequences such as the damage to
your brand.
IT’S IMPORTANT TO DEVELOP A NUMERICAL
SCORING SYSTEM THAT ENABLES YOU TO
MAKE IMPORTANT DECISIONS.
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You would then define five levels of severity in each of
those areas. For example, for maintenance the five levels CMY
could be:
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1. Insignificant: Minimal damage to equipment. No effect
on other equipment. Spare held on site.
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2. Minor: Moderate damage to equipment. Minimal
damage to other equipment. Spare held in region.
3. Moderate: Major damage to equipment. Damage to
other equipment. Spare available in less than one day.
4. Major: Destruction of equipment. Major damage to
other equipment. Spare held in state but available in
more than one day.
5. Extreme: Destruction of equipment. Destruction of
other equipment. Spare not held in state.
Of course, you need to come up with your own ranking according
to your particular situation.
And you would do the same in each of the other areas. If
this is done in complete cooperation with each of the stakeholders
then there should be complete buy-in to the process
and the final ranking.
The idea is that each of the stakeholders would define the
consequence of failure for each asset as they understand it.
You don’t have a maintenance person trying to assess the
consequence of failure in terms of production loss, quality, or
safety. You have experts in those subject areas so they should
be the ones to define the consequence.
Are All Consequences Equal?
There is one more element to consider. You are likely to have
a situation where the most severe consequence in each of the
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