Two of the biggest issues associated with wire ropes are over-torque and rotation. Your best option in a situation like this is to use rotation-resistant wire ropes. When rotation is a known problem, these ropes are often viewed as the most economical and safe choice.
To generate strong resistance to rotation, ropes are created in a contra-helically laid style, making them different from standard wire ropes. The rope's design is intended to reduce the torque rope experiences during normal working conditions.
As rotational resistance increases in a rope, there are certain operational issues that individuals need to be aware of to maintain safe and efficient work environments. Low-torque, stainless-steel wire ropes require special handling to ensure they do not kink, get crushed, or lose balance. When used incorrectly, these ropes are susceptible to birdcaging and core pops. Using extreme care in operational practices is the best way to prevent breaking and dangerous situations.
Wire Rope
Rotation-resistant wire ropes come in different types characterized by their ability to resist rotation.
- In category one, ropes often have 15 or more outer strands and 3 layers of strands that wrap around the core. These ropes have a slight tendency to rotate, and when guided, they create little to no torque.
- In category two, ropes have 10 or more outer strands with two or more laid over the center. This category does not have the same rotation resistance levels as category one, but it still offers significant rotational resistance.
- Category three ropes offer the least protection against torque and rotation. They have the least amount of powder and inner strands. A category three wire rope should not be used with a swivel because of its limited abilities.
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