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WHEN TO USE ROTATION RESISTANT ROPES?


In every wire rope, the helicoidal structure of wires and strands generates torque once the load is lifted. In non- rotation resistant wire rope, the torque is unidirectional as all wires and strands are laid in the same direction. Hence the rope will start to rotate around its longitudinal axis trying to eliminate the torque. In multiple falls and great lifting heights, the torque would eventually cause the hook block to twist.

The working principle of rotation resistant wire rope lies in balancing the torque by means of opposite lay directions of the core and the outer strands. Therefore, in a right hand rope the core is laid left while the outer strands are right lay and vice versa.

Once the load is lifted, the torque generated by the outer lay is eliminated by the torque generated by the inner lay. The rope is stable and will not, or to a very low extent, rotate around its axis.


Non-rotation resistant rope
Rotation resistant rope

 

A wire rope is classified as rotation resistant if it rotates not more than 360° on a length of 1000 times its diameter at 20% load. 

Rotation resistant ropes have to be used when:

  • lifting unguided loads in single fall
  • lifting unguided loads in multiple falls and great lifting heights


Rotation resistant ropes have to be used when:

  • lifting guided loads in single fall
  • lifting unguided loads in multiple falls and low lifting heights
  • lifting unguided loads by pairs of left and right handed rope

ROTATIONAL BEHAVIOUR


All PYTHON rotation resistant rope constructions exceed above given classification by far over a wide load spectrum, making them first choice for applications demanding highly rotation resistant wire rope.

LAY TYPE RECOMMENDATIONS

Depending on the drum type, we recommend the following lay types for PYTHON rope constructions:

Rotation resistant PYTHON ropes (may work with a swivel)

Rotation resistant rope


single layer
drum
recommended
lay type
   multi layer
drum
recommended
lay type
Classic 35Cross layHoist CLang lay
Classic 35 PCross layLiftCross lay
Compac 35Lang lay
Compac 35 PLang lay
Compac 35 PlusLang lay

 

 

Non-rotation resistant PYTHON ropes (must not work with a swivel)

Non-rotation resistant rope
single layer
drum
recommended
lay type
   multi layer
drum
recommended
lay type
Solid 6 RCross layConstruct 6Cross lay
Flameshield 8Cross laySolid 6 CDepends on application
Super 8 RCross laySolid 8 CDepends on application
Power 9 RCross laySuper 8 CDepends on application
MultiCross laySuper 8 SCross lay
Super 8 CDDepends on application
Power 9 SCross lay
Ultra SCross lay
Ultra CPDepends on application

For further support, please contact us ...

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