The SLB load chart shows capacity . Every piece of rigging—slings, shackles, spreader bars, and the hook block itself— subtracts from that number.
Some manufacturers use confusing diagrams or tiny print. Operators new to a brand may misinterpret the data. slb load chart
A few charts fail to boldly warn that lifting without fully deployed outriggers reduces capacity by 50–70%. This has caused rollovers. The SLB load chart shows capacity
Furthermore, A "critical lift" is defined as any lift exceeding 75% of the crane’s rated capacity, any lift involving personnel, or any lift over sensitive equipment. In these cases, a written lift plan referencing the SLB load chart is legally required. Operators new to a brand may misinterpret the data
The LMI is a tool to the chart; it is not the source of truth. LMIs can fail due to sensor drift, damaged wires, or low batteries. The SLB load chart is your analog backup. Moreover, many LMIs are programmed with specific configurations (e.g., 4 parts of line). If you change the rigging, the LMI may not update automatically—the chart forces you to recalculate manually.