Crane Operator Certification Exam Prep · Question
A wire rope sling with a diameter of 25 mm is being used in a basket hitch over a piece of structural steel. To avoid a significant reduction in the sling's working load limit due to bending stress, what is the minimum recommended diameter for the contact surface (D) based on typical industry standards (e.g., ASME B30.5 adapted to CSA)?
For wire rope slings, a D/d ratio of at least 6:1 (or 8:1 for better practice) is generally recommended to minimize strength loss due to bending. For a 25 mm ro
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Question: A wire rope sling with a diameter of 25 mm is being used in a basket hitch over a piece of structural steel. To avoid a significant reduction in the sling's working load limit due to bending stress, what is the minimum recommended diameter for the contact surface (D) based on typical industry standards (e.g., ASME B30.5 adapted to CSA)?
Answer options:
- 25 mm
- 75 mm ✅ 150 mm
- 250 mm
Correct answer: 150 mm
Explanation: For wire rope slings, a D/d ratio of at least 6:1 (or 8:1 for better practice) is generally recommended to minimize strength loss due to bending. For a 25 mm rope, 6 x 25 mm = 150 mm. This adherence to appropriate D/d ratios is specified in rigging guidance under CSA Z150.
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