A crane is lifting a 8,000-pound load at a 30-foot radius. The load chart indicates a capacity of 10,000 pounds at this radius, but the crane is operating on a 2-degree slope. What capacity reduction should be applied?
Correct Answer
C) No reduction needed
Most crane manufacturers allow operation on slopes up to 1% grade (approximately 0.6 degrees) without capacity reduction. However, slopes over 1% typically require capacity reductions as specified in the manufacturer's load chart.
Why This Is the Correct Answer
Most crane manufacturers allow operation on slopes up to 1% grade (approximately 0.6 degrees) without capacity reduction. However, slopes over 1% typically require capacity reductions as specified in the manufacturer's load chart.
Why the Other Options Are Wrong
Option A: 10%
A 5% capacity reduction would be insufficient for a 2-degree slope. Since 2 degrees significantly exceeds the 0.6-degree (1% grade) threshold where reductions begin, a mere 5% reduction underestimates the safety impact of operating on such a steep slope.
Option B: 5%
A 15% capacity reduction would be excessive and overly conservative for a 2-degree slope. While safety is paramount, this level of reduction goes beyond what most manufacturer specifications require for this degree of slope.
Option D: 15%
The explanation provided contradicts this answer choice. Since the crane is operating on a 2-degree slope, which exceeds the 1% grade (0.6 degrees) threshold mentioned, a capacity reduction would indeed be required according to manufacturer specifications.
Memory Technique
Remember '1% = 0.6 degrees' as the magic threshold - anything over this small angle requires you to 'reduce and check the chart' for crane capacity adjustments.
Reference Hint
OSHA 29 CFR 1926 Subpart CC - Cranes and Derricks in Construction, specifically sections on load charts and operating procedures on slopes
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