Which wire rope should not be used in single part hoisting lines due to untwist tendency?

Which wire rope should not be used in single part hoisting lines due to untwist tendency?

• A. Regular lay
• B. Lang lay
• C. Right lay
• D. Stiff lay

Answer: (B)

Lay direction and how the rope behaves under load is what this item is about. Lang lay rope has its strands laid opposite to the rope’s overall twist. In a single-part hoisting line, the rope runs over a drum and experiences torque as it rotates. With the reversed lay, this torque encourages the strands to unwind along the length of the rope under tension, so the rope tends to untwist. That untwisting weakens the rope’s grip on the drum, increases wear, and raises the risk of damage or failure during a lift. For single-part hoisting, regular lay (and, in some cases, stiff lay) lines behave more predictably and resist untwisting, so lang lay is not suitable for this use.

Lay direction and how the rope behaves under load is what this item is about. Lang lay rope has its strands laid opposite to the rope’s overall twist. In a single-part hoisting line, the rope runs over a drum and experiences torque as it rotates. With the reversed lay, this torque encourages the strands to unwind along the length of the rope under tension, so the rope tends to untwist. That untwisting weakens the rope’s grip on the drum, increases wear, and raises the risk of damage or failure during a lift. For single-part hoisting, regular lay (and, in some cases, stiff lay) lines behave more predictably and resist untwisting, so lang lay is not suitable for this use.