Rigging and Heavy Lift
13 calculators and reference tiles for rigging and heavy lift. Every tile runs entirely in your browser. No account. No fee. No advertising. No tracking.
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.