Crane Operator Certification Exam Prep · Question
An operator is setting up a 90-tonne RT crane on a site with soil rated for 200 kPa. The crane manufacturer's chart indicates a maximum outrigger reaction force of 150,000 kg. If the crane uses standard 0.7 m x 0.7 m outrigger pads, what is the minimum required area for a mat under each outrigger pad to safely distribute the load?
Required Area (A) = Force (F) / Allowable Pressure (P). Force = 150,000 kg * 9.81 m/s² = 1,471,500 N. Allowable Pressure = 200 kPa = 200,000 Pa. Area = 1,471,50
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Question: An operator is setting up a 90-tonne RT crane on a site with soil rated for 200 kPa. The crane manufacturer's chart indicates a maximum outrigger reaction force of 150,000 kg. If the crane uses standard 0.7 m x 0.7 m outrigger pads, what is the minimum required area for a mat under each outrigger pad to safely distribute the load?
Answer options:
- 7.35 m² ✅ 6.12 m²
- 4.87 m²
- 3.68 m²
Correct answer: 6.12 m²
Explanation: Required Area (A) = Force (F) / Allowable Pressure (P). Force = 150,000 kg * 9.81 m/s² = 1,471,500 N. Allowable Pressure = 200 kPa = 200,000 Pa. Area = 1,471,500 N / 200,000 Pa = 7.3575 m². This ensures the pressure on the ground does not exceed its bearing capacity, as required by CSA Z150 Clause 5.2.1.
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- A crane's rated capacity decreases as the load radius:
- What is the minimum number of full wraps of wire rope that must remain on a hoist drum when the hook is in its
- Before setting up a mobile crane, what is the most important factor to assess regarding ground conditions?
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