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.Continue Reading