During a crane lift, the load being lifted weighs 8,000 pounds and the crane's load chart shows a capacity of 10,000 pounds at the current radius. What is the safety factor for this lift?
Correct Answer
C) 1.25
The safety factor is calculated by dividing the crane's rated capacity by the actual load weight: 10,000 ÷ 8,000 = 1.25. This meets the minimum recommended safety factor for crane operations.
Why This Is the Correct Answer
The safety factor is calculated by dividing the crane's rated capacity by the actual load weight. In this case: 10,000 pounds (capacity) ÷ 8,000 pounds (load) = 1.25. This calculation gives the ratio of available capacity to actual load, indicating how much additional capacity exists beyond what is being used. A safety factor of 1.25 means the crane has 25% more capacity than the load requires.
Why the Other Options Are Wrong
Option A: 1.5
A safety factor of 1.5 would require the crane's capacity to be 1.5 times the load weight, which would mean a capacity of 12,000 pounds (8,000 × 1.5). Since the actual capacity is only 10,000 pounds, this safety factor is incorrect for this scenario.
Option D: 1.0
A safety factor of 2.0 would require the crane's capacity to be twice the load weight, meaning a capacity of 16,000 pounds (8,000 × 2.0). The actual capacity of 10,000 pounds is insufficient to achieve this safety factor level.
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