Efficient Plant March 2020 - 10

feature | predictive maintenance

Use
Predictive

To Get to
Prescriptive

Preventive asset-management is a stepping
stone to prescriptive practices.

Paul Gogarty
ABB Asset Lifecycle Services

AS WE LIVE and work in the era of the Industrial
Internet of Things (IIoT), we get used to seeing constant innovation in technology and equipment, and
the new capabilities this offers across industrial and
process automation. With this comes new ideas and
applications that will become part of our toolbox and
vocabulary in the years ahead, if they haven't already.
Our approach to asset maintenance is a good example
of this evolutionary arc.
Historically, preventive maintenance has been
the prevailing practice across industry. With this
approach, maintenance is conducted at set time
intervals, or after a certain amount of usage, usually
pre-determined by timelines set by the manufacturer.
It is hoped that performing full or partial maintenance on an agreed timetable will prevent unscheduled downtime caused by machine breakdown or
failure. This entails strict record keeping and careful
planning and scheduling of maintenance actions. A
key element of preventive maintenance is that it is
conducted irrespective of whether the machinery is
operating optimally and, therefore, whether maintenance is actually required.
Internet of Things technology is permitting manufacturers to use data, gathered through automated
systems, to actually predict a failure and prescribe
preventive actions based on historical data that takes
into account the specifics of the individual process,
product being made, and the environment in which
it is being manufactured. This approach prevents
imminent failures, greatly assists with scheduling,
optimizes uptime, and reduces overall maintenance
costs by applying maintenance resources at optimum
times. The result is a positive impact on an enterprise's
profitability. This technology is a stepping stone to
successively smarter and more automated maintenance practices that make effective use of human
resources.
The predictive and prescriptive terms are often used
interchangeably, as if they refer to the same thing.
This is incorrect. While predictive maintenance is
being adopted with increasing frequency, prescriptive
Establishing predictive-maintenance practices will pay
significant dividends, but the target should be a
prescriptive-maintenance culture.

10

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MARCH 2020

2/18/20 10:36 AM


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Efficient Plant March 2020

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