Crane Operator Certification Exam Prep · Question
An operator is preparing to lift a 5,000 kg structural steel beam using a synthetic sling. The sling has a rated WLL of 6,000 kg in a straight pull. If the sling is used in a basket hitch with the legs at a 90-degree angle from each other (45 degrees from vertical), what is the effective WLL for this lift?
In a basket hitch, the sling is effectively doubled, and the WLL is multiplied by 2, then derated for the angle. The angle factor for 45 degrees from vertical i
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Question: An operator is preparing to lift a 5,000 kg structural steel beam using a synthetic sling. The sling has a rated WLL of 6,000 kg in a straight pull. If the sling is used in a basket hitch with the legs at a 90-degree angle from each other (45 degrees from vertical), what is the effective WLL for this lift?
Answer options:
- 6,000 kg ✅ 8,484 kg
- 12,000 kg
- 9,000 kg
Correct answer: 8,484 kg
Explanation: In a basket hitch, the sling is effectively doubled, and the WLL is multiplied by 2, then derated for the angle. The angle factor for 45 degrees from vertical is 1.414. So, effective WLL = (2 * Straight Pull WLL) * Angle Factor = (2 * 6,000 kg) * cos(45°) = 12,000 kg * 0.707 ≈ 8,484 kg. The 12,000 kg would only apply if the legs were vertical.
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