Intermediate Rigging (RI) case studies
Intermediate Rigging (RI) · Put your knowledge to work in context.
The Intermediate Rigging (RI) credential is positioned as a mid-level qualification for construction craft professionals who already understand basic rigging and want to take on more complex lifts. It typically suits riggers, millwrights, ironworkers, crane crew members, and apprentices preparing to work under less direct supervision. The Intermediate Rigging (RI) case studies are 5 cases and about 3,890 words.
1Sling Angle and Capacity on a Skewed Pick
You are rigging a 4,800 lb skid with four lifting points at the corners. The crane hook is directly above the load's geometric center, but the skid's center of gravity sits 18 in off-center toward one end, so the two slings on that end carry more tension than the other two.
907 words, about 5 min2Wire Rope Sling Inspection Before a Critical Pick
A 2-inch, 6x37 IWRC wire rope sling with an eye on each end is scheduled to lift a 12,000 lb vessel. During inspection you find: (a) one broken outer wire in a valley between strands; (b) several broken wires at the end fitting; (c) a kink with a permanent bend near one eye; (d) heavy wear flattening the outer wires over a 6 in length; (e) a tag that is faded and unreadable.
723 words, about 4 min3Shackle and Hook Selection for an Off-Axis Pull
You must lift a 9,000 lb steel plate using a single-leg sling attached to a screw-pin shackle through a 1.25 in thick lug. The shackle available is a 1-inch screw-pin anchor shackle with a rated capacity of 8.5 tons.
767 words, about 4 min4Load Chart, Radius, and Ground Bearing on a Tight Site
A 50-ton rough-terrain crane is set up on a compacted gravel pad to lift a 14,000 lb pump skid from a truck at a 30 ft radius and set it at a 42 ft radius, 90 degrees around the swing. The boom is 70 ft long with no jib.
751 words, about 4 min5Blind Lift Communication Failure
You are the signal person for a lift where the operator cannot see the load for the last 15 ft of travel because a wall blocks the view. The load is a 6,000 lb steel beam that must be landed on two anchor bolts, with a tolerance of about 1 inch.
742 words, about 4 min