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Pre-Lift Planning & Load Chart Interpretation Flashcards

6 cards from real OSHA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Pre-Lift Planning & Load Chart Interpretation flashcards as text

  1. What does 'derating' a crane mean in pre-lift planning?

    Answer: Reducing the rated capacity due to site conditions such as ground stability or wind

    Derating means applying a reduction factor to the crane's chart capacity to account for adverse conditions like soft ground, wind, or blocked outriggers.

  2. Which ground condition requires additional engineering evaluation before positioning outriggers?

    Answer: Soil over underground utilities or voids

    Soil over underground utilities, tunnels, or voids may collapse under outrigger loads and requires engineering evaluation of bearing capacity.

  3. A lift plan calls for a 40-ton load at a 30-foot radius. The load chart shows a 45-ton capacity at that radius. What is the load line percentage?

    Answer: 89%

    40 tons ÷ 45 tons × 100 = 88.9%, approximately 89% of rated capacity, which qualifies as a critical lift.

  4. When must a crane operator refuse to make a lift?

    Answer: When the load weight is unknown or exceeds rated capacity

    OSHA requires operators to refuse any lift where the load weight is unknown or where the load would exceed the crane's rated capacity.

  5. What is the purpose of outrigger pads (cribbing) during a crane setup?

    Answer: To distribute the outrigger point load over a larger soil area and prevent punch-through

    Outrigger pads spread the concentrated load from the outrigger float across a larger surface area, reducing ground pressure and preventing sinkage.

  6. In a pre-lift plan, the 'pick radius' differs from the 'set radius' when:

    Answer: The load will be lifted and swung to a different location at a different distance from the crane

    Pick radius is where the load originates and set radius is where it is placed; if they differ, the operator must verify rated capacity at both radii.