Advanced Rigging (RA) case studies

Advanced Rigging (RA) · Put your knowledge to work in context.

The Advanced Rigging (RA) credential is a professional certification for experienced riggers who plan and supervise complex lifts rather than only executing routine ones. It suits riggers, crane and hoist operators, millwrights, and lift planners who already know basic slinging and hitch selection and now need to calculate loads, select below-the-hook hardware, and direct multi-part lifting systems safely. The Advanced Rigging (RA) case studies are 5 cases and about 2,787 words.

Unequal-Leg Bridle on an Offset Pick Point

A 9,600 lb skid must be lifted from two existing lugs that are not symmetric about its center of gravity. Lug A is 4 ft from the CG line; Lug B is 8 ft from the CG line, both on the same side of the load's vertical axis, so the hook sits between them.

542 words, about 3 min 2

Two-Part Hoist Line With a Snatch Block on an Angled Pull

A 4,000 lb pump skid is to be dragged up a 15-degree ramp and then lifted clear. The crew plans to use a snatch block on a structural column to redirect a two-part hoist line.

622 words, about 3 min 3

Wire Rope With Broken Wires and a Questionable Splice

A 1-inch, 6x19 IWRC wire rope sling with a hand-tucked Flemish eye and a pressed sleeve is being used to lift 8,000 lb in a two-leg bridle at 45 degrees. During pre-use inspection a rigger counts 9 broken wires in one lay, distributed over about 2 inches, all in a section that runs over a shackle.

472 words, about 2 min 4

Critical Lift Plan for a Tandem Pick Near a Live Line

Two 50-ton mobile cranes will tandem-lift a 38,000 lb vessel from a truck to a foundation. Crane 1 will take 60 percent and Crane 2 will take 40 percent per the plan, but the rigging geometry places the hook of Crane 2 closer to the load's center, which tends to increase its share.

574 words, about 3 min 5

Jacking and Skidding a Machine Base With Questionable Support

A 22,000 lb machine base must be moved 30 ft across a concrete floor with a 4-inch step down at a doorway. The crew plans to use four hydraulic jacks rated 10 tons each, steel rollers under 1-inch plate, and a come-along for the pull.

577 words, about 3 min