www.machinerylubrication.com
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September - October 2016
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5
Oil Level Gauges — These can be electronic,
mechanical or a device that provides a visual indi-
cation of the oil level. Abnormal oil levels are often
very meaningful and for many machines can lead
to sudden-death failures. High oil levels might
represent in-leaks (cross-contamination) of
coolant, fuel or other lubricants. Low oil levels can
be caused by high oil consumption or out-leaks.
Oil level gauges should be marked to show the
normal range for stopped machines as well as
running machines, depending on the machine
type. Level gauges should also be positioned for
convenient viewing, especially by the person
performing oil top-ups and changes.
Sight Glasses — Good sight glasses are far
more than oil level gauges. They can communi
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cate key transient conditions associated with
localized areas of the machine. See my Machinery
Lubrication article on zone inspections for a
detailed narrative on the vast amount of informa
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tion these inspection windows can provide. They
include bottom sediment and water (BS&W)
bowls, inline sight glasses (to confirm oil flow)
and clear piping/hoses for fluid inspections.
Part-Movement Windows — Many machines
need windows to verify proper movement of
parts, such as oil rings, collar oilers, slingers and
flingers. Certain belt, screw, chain and gear
drives may need an inspector's line of sight.
Expanded Metal Guards — Couplings and
other exposed rotating or reciprocating mecha-
nisms are typically protected from accidental
contact by the use of guards. These guards often
restrict visual observation of the movement
mechanisms. However, they can be replaced with
expanded metal so that both functions (safety
and inspection) can be enabled.
Ferro Sites for Magnetic Particle Collection
— These are magnets flooded in oil and placed
behind inspection windows. Ferro sites are
usually located on the return line where the ferro-
magnetic debris is the highest. The window can
be periodically opened to clean the magnet.
Lubricant Sampling
Sump Drains with BS&W Valves — It's good
to be paranoid about what might be sitting on
the bottom of your sump or reservoir. It probably
Vacuum Gauge
Sight Glass, Corrosion Indicator, Wear
Debris Collector, Sample Valve
Inspection Hatch
