When a load is being rigged for moving with a mobile crane, the crane operator can quickly estimate the slings and shackles required for the lift.
Below you’ll notice Panel 20 of ITI’s Mobile Crane Operator Reference Card. This panel was designed to help approximate the minimum rigging necessary, based on tension or load weight. Standard rigging cards provide more exact data, but for estimation from the operator’s perspective, this will get close without being under-rigged.
Workshop Assignment: Double check the selections made by the rigging crew to see if they have rigged the load with sufficiently rated rigging equipment. (Answers below)
1. What are the sling/shackle descriptions required to lift the load at right?
A. If wire rope sling, then the wire rope diameter should be ____”.
B. If roundsling, then use a(n) ________.
C. If alloy chain sling, then the chain size should be ____”.
D. The SPA shackle attached at the load should be ____”.
2. Based on the slings and shackles assembled by the riggers for the following loads, indicate if the rigging equipment is being used within or beyond its rated capacity.
Happy trails to all my crane and rigging friends,