Crane and Rigging Safety Flashcards

What is the primary purpose of a crane's load chart?

Answer: To define maximum lifting capacities at various radii and boom angles

Load charts provide the rated capacity of a crane at specific boom lengths, radii, and configurations to prevent overloading.

Which condition requires a crane to be taken out of service immediately?

Answer: A cracked load hook with a visible deformation

A cracked or deformed hook is a critical defect that can cause sudden load drop and must be removed from service until repaired or replaced.

When must a pre-lift meeting be conducted on a critical lift?

Answer: Before the lift begins, with all personnel involved in the operation

Pre-lift meetings must occur before the lift to ensure all personnel understand the plan, signals, hazards, and responsibilities.

A rigger notices that a wire rope sling has a kink that cannot be straightened. What should the rigger do?

Answer: Tag and remove the sling from service

A kinked wire rope sling is permanently damaged and weakened; it must be removed from service and destroyed.

What factor determines whether a lift is classified as a 'critical lift' under ASME B30.5?

Answer: The load exceeds 75% of the crane's rated capacity or involves unusual hazards

ASME B30.5 and most site standards classify a lift as critical when it exceeds 75% of rated capacity or presents exceptional hazards such as lifts over personnel or energized equipment.

What is the minimum clearance a crane must maintain from energized power lines rated at 50 kV or below, per OSHA 1926.1408?

Answer: 10 feet

OSHA 1926.1408 requires a minimum 10-foot clearance from power lines up to 50 kV unless the utility owner de-energizes or insulates the lines.

A synthetic web sling is rejected when an inspection reveals what condition?

Answer: Broken or cut load-bearing fibers

Broken or cut load-bearing fibers directly reduce the sling's rated capacity and require immediate removal from service.