Knowde Enhanced TDS
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- Cables can be damaged by worn sheaves, improper winding and splicing practices and improper storage. High stress loading, shock loading, jerking heavy loads or rapid acceleration or deceleration (speed of the cable stopping and starting) will also accelerate the wear rate.
- Corrosion can cause shortened rope life due to metal loss, pitting and stress risers from pitting. If a machine is to be shut down for an extended period the cables should be removed, cleaned, lubricated and properly stored. In service, corrosion and oxidation are caused by fumes, acids, salt brines, sulfur, gasses, salt air, humidity and are accelerated by elevated temperatures. Proper and adequate lubricant application can reduce corrosive attack of the cable.
- Abrasive wear occurs on the inside and outside of wire ropes when strands inside the rope move & rub against each other. The outside of the cable accumulates dirt and contaminants from sheaves and drums which erodes the outer wires and strands.
- Abrasive wear usually reduces rope diameter and can result in core failure and internal wire breakage. Regular relubrication is required due to loss of the original lubricant from loading, bending and stretching of the cable to minimize corrosion, protect and preserve the rope core and wires, and thus extend the service life of the wire rope.
- Wire Rope Lubrication
Lubricating wire ropes is difficult because of their construction and composition. Fiber cores ropes are easier to lubricate than those made exclusively from steel materials. For this reason, it is important to carefully consider the issue of field re-lubrication when selecting rope for an application. Wire rope lubricants need to: 1) Reduce friction as the wires move over each other. 2) Provide corrosion protection and lubrication in the core and on the exterior surfaces.
There are two types of wire rope lubricants: penetrating and coating. Penetrating lubricants contain a solvent which carries the lubricant into the core of the wire rope and then evaporates off leaving a heavy lubricating film to protect and lubricate each strand. Coating lubricants penetrate slightly, sealing the outside of the cable from moisture and reducing wear and fretting corrosion from contact with external bodies.
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