Type I, Regular: Does not prevent rust and is
used where rust prevention is not needed; for example,
elevator wires used inside are not exposed to the
weather but need lubrication.
Type II, Protective:
A lubricant and an
anticorrosive that comes in three grades: grade A, for
cold weather (60°F and below); grade B, for warm
weather (between 60°F and 80°F); and grade C, for hot
weather (80°F and above).
The oil, issued in 25-pound and 35-pound buckets
and in 100-pound drums, can be applied with a stiff
brush, or the wire rope can be drawn through a trough
of hot lubricant, as shown in figure 5-28. The
frequency of application depends upon service
conditions; as soon as the last coating has appreciably
deteriorated, it should be renewed.
A good lubricant to use when working in the field,
as recommended by COMSECOND/COMTHIRD
NCBINST 11200.11, is a mixture of new motor oil and
diesel fuel at a ratio of 70-percent oil and 30-percent
diesel fuel. The NAVFAC P-404 contains added
information on additional lubricants that can be used.
Never lubricate wire rope that works a dragline or
other attachments that normally bring the wire rope in
contact with soils. The reason is that the lubricant will
pick up fine particles of material, and the resulting
abrasive action will be detrimental to both the wire
rope and sheave.
As a safety precaution, always wipe off any excess
when lubricating wire rope, especially with hoisting
equipment. Too much lubricant can get into brakes or
clutches and cause them to fail. While in use, the
Figure 5-28.Trough method of lubricating wire rope
motion of machinery may sling excess oil around over
crane cabs and onto catwalks, making them unsafe.
Wire rope should never be stored in an area where
acid is or has been kept. This must be stressed to all
hands. The slightest trace of acid or acid fumes coming
in contact with wire rope will damage it at the contact
spot. Wire that has given way has been found many
times to be acid damaged.
It is paramount that wire rope be cleaned and
lubricated properly before placing it in storage.
Fortunately, corrosion of wire rope can be virtually
eliminated if lubricant is applied properly and
sufficient protection from the weather is provided,
Remember that rust, corrosion of wires, and
deterioration of the fiber core will significantly reduce
the strength of wire rope. Although it is not possible
to say exactly the loss due to these effects, it is
certainly enough to take precautions against.