19×7 Rotation Resistant Wire Rope

19×7 Rotation Resistant Wire Rope
ROPE CHARACTERISTICS
Using the rope to its maximum fatigue life will cause the rope to deteriorate from the inside out. Sudden rope failures may be the result. For this reason, we do not recommend this construction for tower cranes. There have been fatal and catastrophic accidents involving this rope construction because of undetected inner rope fatigue.
However, mobile and truck mounted cranes are operated on a much less severe duty cycle and it is not expected that 19x7 has to be replaced because of inner rope fatigue but because of other mechanical damages. Keep in mind that this statement covers normal mobile crane use. If you use a mobile crane like a production crane you WILL experience the above-mentioned danger situations.
PLUS, regular type 19x7 does not spool very well on multiple layer drums; there is too much strand interlocking causing excessive rope abrasion.
Material: AISI304/ AISI316
Care & Handling
Correct usage and care with handling will prolong the working life. This is due to the friction on the inner wires caused by the strand crossover’s which will eventually cause the inner wires to break up. This is more apparent on Non Rotating Wire Rope with two layers. Ropes with 3 or more strand layers will distribute the radial pressures more evenly. Which will reduce friction and stress on the inner wires.
Regular, thorough inspections of non rotating rope are essential due to the fact that it is the inner strands that often break first and broken internal wires often go unnoticed as they are difficult to see.
Rotation Resistant Rope should avoid shock loading. This is because rope distortions, bird caging and core protrusion can occur.
Holding both ends of the rope will prevent unraveling.  Correctly fitted terminations will help to prevent damage.  Kinking and unraveling may occur and they can also have an effect on the rotational balance if not fitted correctly.