A client requests a critical lift involving a 22,000 kg load at 20 meters radius. The crane's load chart for the current boom length shows a gross capacity of 23,500 kg at 18 meters radius and 20,000 kg at 22 meters radius. The combined weight of all deductions (hook block, rigging) is 1,200 kg. Can this lift be performed?

Question: A client requests a critical lift involving a 22,000 kg load at 20 meters radius. The crane's load chart for the current boom length shows a gross capacity of 23,500 kg at 18 meters radius and 20,000 kg at 22 meters radius. The combined weight of all deductions (hook block, rigging) is 1,200 kg. Can this lift be performed?

Answer options: ✅ No, the net capacity at 20m radius is insufficient.

• Yes, the gross capacity is always greater than the combined load and deductions.
• Yes, 22,000 kg is less than 23,500 kg.
• Only if the radius is reduced to 18 meters.

Correct answer: No, the net capacity at 20m radius is insufficient.

Explanation: First, interpolate the gross capacity at 20m radius: (23,500 kg - 20,000 kg) / (22m - 18m) = 3,500 kg / 4m = 875 kg/m. From 18m to 20m (2m increase): 23,500 kg - (875 kg/m * 2m) = 23,500 - 1,750 = 21,750 kg. This is the gross capacity at 20m. Net capacity = Gross Capacity - Deductions = 21,750 kg - 1,200 kg = 20,550 kg. Since the required load (22,000 kg) exceeds the net capacity (20,550 kg), the lift cannot be performed. This involves multiple steps of calculation and interpretation, making it a hard difficulty question based on CSA Z150.