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Critical Lift

While there appears to be no precise, all encompassing definition of a critical lift, some common items consistently appear in the numerous published lists of reasons for a lift to be considered critical. Lists researched for this article were universally presented in a fashion that indicated that any single occurring item in the list would cause the lift to be considered critical.

OSHA Defined Critical Lift 
According to OSHA (29 CFR 1926.751) a critical lift means a lift that: (1) exceeds 75 percent of the rated capacity of the crane or derrick, or (2) requires the use of more than one crane or derrick.

Federal laws are published in a collection of codified documents known as the Code of Federal Regulations, CFR for short. The details we as riggers are interested in are in the Labor section, Title 29, Part 1926 – Safety and Health Regulations for Construction.

No Brain-er Approach 
Before presenting the list of commonly appearing reasons for critical lift classification, let's think about the very nature of word “critical” to arrive at a no brain-er approach that should be used in the field. Given safety implications and the risk involved in any lift, some people would argue that every lift to some degree should be considered critical. Aside from this viewpoint however, critical means, if lost, crisis would ensue; critical means urgently needed.

Critical Lift Criteria 
So, after reviewing various industry and governmental agency lists, here is the commonly appearing reasons why a lift should be considered a critical lift:

Other Interesting Reasons
Among other reasons for considering a lift to be critical were these that were developed by industrial interests to satisfy unique requirements: