Efficient Plant March 2021 - 19

When put into service,
critical spares that are
properly lubricated in
storage will be corrosion
free and deliver maximum performance and
longevity.

feature | lubrication solutions

Precision
Lubrication
Applies to
Spares

HAVING AN INVENTORY of spare parts and consumables is
critical to success for asset-intensive industries. From pipes to valves,
hoses, and fittings, most storerooms are packed with commonly used
components. For larger rotating and reciprocating assets that are
critical for success, but may only require replacement parts once or
twice a year, how we store and handle those components and assemblies can have a profound effect on their performance and longevity,
once put into service. While not exhaustive, here are some considerations when storing spare parts that are lubricated with grease or oil.

AMBIENT STORAGE CONDITIONS
The effects of the ambient environment should always be considered. Ideally, all spares should be stored in an environment with a
relative humidity less than 60%, at a temperature between 60 F and
90 F. While the exact temperature is less important, maintaining a
temperature that varies no more than 10 deg. is critical since any
change in temperature will cause air exchange and the possibility of
contamination ingress through thermal syphoning.
All spare parts should be stored away from production areas
where vibration can cause false brinelling of bearings and other

MARCH 2021

EP2103flube.indd 19

Mark Barnes, PhD, CMRP
Des-Case Corp.

How you lubricate and store critical
spares determines whether you'll
realize maximum service life.

components. If this is not possible, efforts should be made to dampen or isolate the component from the vibration source.
Storing lubricants, cleaners, fuel, solvents, or other chemicals in
the same location as spare parts is not recommended since these
can volatilize, creating caustic or acidic conditions that can corrode
metals and seals.

PUMPS, GEARBOXES, WET SUMPS
Most plants carry an inventory of commonly used or hard-to-source
pumps and gearboxes. For smaller units, the best practice is to plug
openings to isolate the interior parts from the outside environment.
Also, fill any sumps with a mineral oil containing a 5% to 10%
vapor-phase corrosion inhibitor (VPCI). Shaft extensions should
be coated with a corrosion inhibitor or oiled impregnated tape and
rotated monthly to prevent fretting corrosion and false brinelling.
Often, the shaft keyway makes a good reference point: rotating the
shaft through 10 to 15 revolutions, before aligning the keyway at the
3, 6, 9, or 12 o'clock location, distributes the lubricant and dissipates
the shaft load (weight).
If the gearbox or pump is equipped with lip seals, packing grease
EFFICIENTPLANTMAG.COM |

19

3/1/21 9:25 AM


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Efficient Plant March 2021

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