Rigging and Heavy Lift

Tiles in this group

• Center of Gravity and Pick-Point Load Share - Load on each of two pick points and the percent imbalance from the total weight, span, and CG offset, with a flag when the CG falls outside the picks. The head rigger and the load weight govern.
• Crane Net Capacity After Deductions - Net capacity for the hook after the OSHA 1926.1417(o) deduction stack (hook block, jib, wire rope), the total hook load, the percent of net, and the 75 / 90 / 100 percent flags. The manufacturer's load chart governs.
• Crane Ground Bearing Pressure and Mat Size - Outrigger / crawler ground bearing pressure vs an allowable soil bearing, the area required to pass, and the square mat or cribbing side. A geotech source and a qualified person govern.
• Wire-Rope Sling D/d Bend Efficiency - Bend efficiency factor and reduced working load limit of a wire-rope sling from the D/d ratio, per the WRTB curve. Inspect every sling before the lift.
• Wind Force and Swing on a Suspended Load - Velocity pressure, lateral wind force, and swing angle on a suspended load from the sail area, wind speed, and shape coefficient. The manufacturer's in-service wind limit governs.
• Tag Line Pull and Handler Count - Tag-line tension to control a suspended load, the number of handlers at a safe per-person pull, and a flag when a mechanical tag is needed. The lift director governs.
• Tandem (Two-Crane) Lift Load Share - Each crane's share of a tandem lift from the CG, the derated allowable per crane, and a combined pass / fail. A designated lift director and an engineered plan govern.
• Shackle / Eye-Bolt WLL and Angular Derate - Working load limit and the angular derate of a shackle (side load) or shoulder eye bolt from the pull angle, with a pass / fail. The manufacturer's chart governs.
• Spreader Bar vs Lifting Beam Below the Hook - Top sling tension, spreader-bar axial compression, lifting-beam bending moment, and headroom for a wide load from one hook. ASME BTH-1 / B30.20 and the rating plate govern.
• Forklift Load-Center Capacity Derate - Net forklift capacity at the actual load center from the data-plate rating, a pass / fail against the load, and the remaining margin. The capacity plate is the legal rating.
• Roller / Skate / Jacking Push Force - Steady and breakaway push force to move a load on rollers or skates, the grade component, and the skate count by capacity. Verify the floor's own capacity.
• Chain / Lever Hoist Effort and Travel - Hand-pull effort, hand-chain travel for the lift, and a pass / fail against the rated WLL of a chain or lever hoist. ASME B30.16 / B30.21; the rated WLL is the ceiling.
• Rigging Block Redirect Resultant Load - Resultant force on a rigging block and its anchor when a line changes direction (up to twice the line tension when doubled back). Size for the resultant, not the line tension.