Wire Rope Direct News

CRANE ROPE part 1

CRANE ROPE / wire rope

Over the coming weeks we will be discussing some important facts to consider when replacing a crane rope, reference should always be made to the original crane rope and be replaced with the closest possible, or a higher specification. We will list the factors to look for such as strength, diameter, bend fatigue, crush and rotation resistance, wear and abrasion, corrosion resistance and lubrication.

STRENGTH:

The strength in wire rope is usually referred to as the minimum breaking load / force, this can be increased for any rope diameter in two ways:

An increase in the tensile strength of the wire used to manufacture the rope will increase the minimum breaking load of the final rope. It is also possible to increase the steel fill factor of the wire rope. The fill factor measures cross sectional area of the rope.

It is possible to slightly increase the fill factor by varying the construction, like adding smaller wires, but more effectively the individual strands can be compacted, the resulting rope has a high steel fill factor and therefore a high breaking load factor for any diameter when compared with a conventional rope.  Lower stress levels occur when conventional ropes are replaced with compacted wire ropes, often leading to more comfortable operation and longer working life.

DIAMETER;

The correct diameter is essential to performance on a crane, and a wire rope that is too big or too small for the drum and sheaves can cause premature rope failure. It is also important to ensure the diameter is consistent throughout the length of the rope, as inconsistency can cause wire breaks and shorten the ropes life.

CRUSH RESISTANCE;

When selecting a wire crane rope, choosing a wire core instead of a fibre core will improve its resistance to crushing.

Compacted rope will also offer greater crush resistance due to its high fill factor, than that of conventional wire rope.

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