Efficient Plant February 2018 - 29

feature | lubrication strategies

surized crankcase ventilation (PCV) system
in use today.
An automotive crankcase is, of course, a
reservoir similar to any gearbox or hydraulic-oil reservoir. In all cases, the reservoir
is an enclosed container used to house oil
that is pumped through the machine to
lubricate bearing surfaces and return to the
reservoir within the closed-loop system.
When designed correctly, the reservoir will
always have an air space (headspace) above
the oil level designed to permit thermal
expansion of the oil and allow the fluid to
de-aerate (aerated fluids cause pump cavitation). To equalize the internal pressure
build up created through the resulting
changes in the oil level as the machine
moves from rest to full operation, and vice
versa, air must be allowed to enter and
exit the reservoir through a device known
simply as a breather.
If air is allowed to freely move in and out
of the reservoir through the breather, so
is everything contained within that air exchange. This can include contaminants and
moisture, both detrimental to the oil and
the very bearings surfaces oil is designed
to protect. This now requires the reliability
engineer and/or maintainer to recognize
the ambient working conditions and choose
the appropriate breather style and type for
the conditions and, furthermore, exercise
diligence, through preventive-maintenance
procedures, to ensure that the breather is
always in place in the reservoir, is clean,
and is unencumbered, allowing it to work
as designed.

the lubrication system preventive-maintenance program. The change-out
schedule is based on application and
ambient conditions. If the breather is a
less-sophisticated design that does not
display its condition to the operator or
maintainer, the rule of thumb is change
out every three months in dirty environ-

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ANATOMY OF A BREATHER
Breathers come in all configurations,
shapes, and sizes, and different styles
accommodate different airflow, particulate size, and working conditions. Most
breathers are consumable devices. As such,
they must be changed regularly as part of

FEBRUARY 2018

If air is allowed to freely
move in and out of
the reservoir through
the breather, so is
everything contained
within that air exchange.

EPRS Maintenance Tech.indd 1

29

1/3/18 9:06 AM

EFFICIENTPLANTMAG.COM |


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Table of Contents for the Digital Edition of Efficient Plant February 2018

Maximize CMMS, EAM Use
Tribology Program Fills Skills Gap
Caring For Bearings In Extreme Environments
Press-Brake Safeguarding Matters
Oil Systems Need To Breathe
SAP: Kicking Bad Habits
Advice For Automated Substations
Good BOMs Boost Maintenance Efficiency
Smarten Up About Rotor Analysis
Heed These Signs of Inefficiency
Implementations
IIoT
Efficiency Insight
Editorial
On The Floor
Solution Focus
Products
Showcase
Efficient Plant February 2018 - Cover1
Efficient Plant February 2018 - Cover2
Efficient Plant February 2018 - 1
Efficient Plant February 2018 - 2
Efficient Plant February 2018 - 3
Efficient Plant February 2018 - 4
Efficient Plant February 2018 - 5
Efficient Plant February 2018 - Editorial
Efficient Plant February 2018 - 7
Efficient Plant February 2018 - Implementations
Efficient Plant February 2018 - 9
Efficient Plant February 2018 - Maximize CMMS, EAM Use
Efficient Plant February 2018 - 11
Efficient Plant February 2018 - 12
Efficient Plant February 2018 - 13
Efficient Plant February 2018 - Tribology Program Fills Skills Gap
Efficient Plant February 2018 - 15
Efficient Plant February 2018 - 16
Efficient Plant February 2018 - 19
Efficient Plant February 2018 - 20
Efficient Plant February 2018 - Caring For Bearings In Extreme Environments
Efficient Plant February 2018 - 22
Efficient Plant February 2018 - 17
Efficient Plant February 2018 - 18
Efficient Plant February 2018 - 19
Efficient Plant February 2018 - 20
Efficient Plant February 2018 - Caring For Bearings In Extreme Environments
Efficient Plant February 2018 - 22
Efficient Plant February 2018 - 23
Efficient Plant February 2018 - Press-Brake Safeguarding Matters
Efficient Plant February 2018 - 25
Efficient Plant February 2018 - 26
Efficient Plant February 2018 - 27
Efficient Plant February 2018 - Oil Systems Need To Breathe
Efficient Plant February 2018 - 29
Efficient Plant February 2018 - 30
Efficient Plant February 2018 - SAP: Kicking Bad Habits
Efficient Plant February 2018 - Advice For Automated Substations
Efficient Plant February 2018 - Good BOMs Boost Maintenance Efficiency
Efficient Plant February 2018 - Smarten Up About Rotor Analysis
Efficient Plant February 2018 - Heed These Signs of Inefficiency
Efficient Plant February 2018 - On The Floor
Efficient Plant February 2018 - 37
Efficient Plant February 2018 - IIoT
Efficient Plant February 2018 - Solution Focus
Efficient Plant February 2018 - 40
Efficient Plant February 2018 - Products
Efficient Plant February 2018 - 42
Efficient Plant February 2018 - 43
Efficient Plant February 2018 - 44
Efficient Plant February 2018 - Showcase
Efficient Plant February 2018 - 46
Efficient Plant February 2018 - 47
Efficient Plant February 2018 - Efficiency Insight
Efficient Plant February 2018 - Cover3
Efficient Plant February 2018 - Cover4
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