Crane Operator Certification Exam Prep · Question
A crane's outriggers are set up on pontoons on soft ground to distribute the load. The load chart is based on the outriggers being fully extended on firm, level ground. What must the operator consider regarding the chart capacities?
CSA Z150 states that load charts are based on the crane being set up on a firm, level surface. It is critical that the ground support system (e.g., pontoons) ef
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Question: A crane's outriggers are set up on pontoons on soft ground to distribute the load. The load chart is based on the outriggers being fully extended on firm, level ground. What must the operator consider regarding the chart capacities?
Answer options: ✅ The chart capacities are only valid if the ground support adequately mimics 'firm, level ground' conditions.
- Capacities can be increased by 10% due to the increased bearing area of the pontoons.
- The chart capacities remain valid as long as the outriggers are fully extended.
- Only the 'On Tires' capacity should be used, regardless of pontoon use.
Correct answer: The chart capacities are only valid if the ground support adequately mimics 'firm, level ground' conditions.
Explanation: CSA Z150 states that load charts are based on the crane being set up on a firm, level surface. It is critical that the ground support system (e.g., pontoons) effectively provides equivalent or better support to ensure the chart capacities are valid. If not, the crane's stability and structural integrity become compromised, invalidating the chart. The operator is responsible for verifying ground conditions.
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Question explanations
- According to most Canadian provincial regulations, who is ultimately responsible for the safe operation of a c
- 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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