Efficient Plant May 2020 - 27

feature | lubrication strategies
also cool and contract. In doing so, make-up air
Use a Filter Cart When Oil Changes Aren't Possible
will be pulled in from the outside. If the make-up
air is dirty or moist, the contaminants may cause
P (potential failure)
failures to occur at a later date. For idled equipF2 (functional failure)
with a filter cart
ment, water is more of an insidious contaminant
than particles. As the air cools, water vapor in
the headspace will condense, causing free and
F1 (functional failure)
without a filter cart
emulsified water to form in the oil. In turn, this
can cause rust, corrosion, and other failure modes.
The best way to protect against moisture
Time
ingression is to install a desiccant breather on all
When production demands are high and normal lubricant maintenance has to be set aside, using
oil sumps and reservoirs. Not only does a breather
an oil filter cart is one of several techniques that can prevent premature functional failure.
remove moisture when make-up air enters the
machine, it will also actively dehumidify the
headspace when the machine is shut down, much
like a sachet of silica gel that is often included to protect high-end
unprecedented levels, or just about to turn things back on. EP
consumer products, such as electronics, from moisture. For gearboxes, it may also make sense to use vapor-phase corrosion inhibitors
Mark Barnes, CMRP, is Senior Vice President at Des-Case Corp.,
that can be added to the gear oil to provide headspace corrosion
Goodlettsville, TN (descase.com). He has 21 years of experience in
protection. Always consult with the lubricant manufacturer prior to
the fields of lubrication management, oil analysis, and contamination
using corrosion inhibitors to insure compatibility with the lubricant.
control and has published more than 150 technical articles and
white papers.

RE-STARTING IDLE ASSETS?

Downturns caused by economic conditions or natural disasters do
not last forever. Inevitably, conditions will improve and production
will be back in full swing. While some start-up activities are simply
the reverse of shutdown procedures-reinstate deferred PMs, turn
auto-lubricators back on-significant care must be exercised with
some equipment.
For circulating lubrication systems and hydraulics, we need to
look at deposits that may have formed when the machine was shut
down and the oil temperature was lower. Byproducts of oil degradation, such as sludge and varnish, may come out of solution at lower
oil temperatures and can cause restricted oil flow, valve stiction, and
other operational challenges when equipment comes back online.
Taking a baseline oil sample as a "health-check" to measure oil
cleanliness (water and particle count), varnish potential (MPC test),
and additive health (RulerTM test), is a good idea prior to starting
the machine. If excessive contamination or deposit formation is
found, these contaminants should be removed through appropriate
offline filtration prior to and during start-up.
Machines thrive on consistency. Sometimes life throws us a curve
ball and, while our natural inclination may be to hunker down,
perhaps we should follow Sir Winston Churchill's advice and "never
let a good crisis go to waste." Let's take the opportunity to look at
how we protect our assets, whether we are shut down, producing at

MAY 2020

EP2005flube.indd 27

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Efficient Plant May 2020

Table of Contents for the Digital Edition of Efficient Plant May 2020

Efficient Plant May 2020 - loc
Efficient Plant May 2020 - Cover1
Efficient Plant May 2020 - gatefold1
Efficient Plant May 2020 - gatefold2
Efficient Plant May 2020 - IFC
Efficient Plant May 2020 - 1
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Efficient Plant May 2020 - mi1
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