Critical Lift
A crane lift that exceeds a specified percentage of rated capacity or involves unusual hazards requiring extra planning.
In Detail
A critical lift is generally defined as any lift that exceeds 75% of the crane's rated capacity at the maximum radius, involves lifting personnel, requires multiple cranes, passes over occupied areas, or involves other unusual hazards. The specific threshold varies by company policy — some use 80% or 90%. Critical lifts always require a formal, written lift plan reviewed and approved by qualified personnel before the operation begins. They typically require additional safety measures such as tag lines, dedicated signal persons, barricaded areas, and pre-lift meetings with all involved personnel.
Related Terms
Lift Plan
A documented plan specifying the crane, rigging, load path, and safety procedures for a critical lift.
Rated Capacity
The maximum load a crane can safely lift at a given configuration, as specified by the manufacturer's load chart.
Load Chart
A manufacturer-provided chart showing the maximum safe lifting capacities at various boom lengths and radii.
Qualified Person
An individual with recognized credentials and demonstrated ability to solve crane inspection and safety problems.