Rigging and Heavy Lift

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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.
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.
Crane Power Line Clearance (OSHA 1926.1408) - The 20 ft everyone carries is a DEFAULT you take when you have not determined the voltage.
Crane Ground Bearing Pressure and Mat Size - Outrigger / crawler ground bearing pressure vs an allowable soil bearing, the area required to pass.
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.
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.
Max Wind Speed Before a Load's Swing Limit - The sustained wind speed at which a suspended load reaches a maximum allowable swing.
Tag Line Pull and Handler Count - Tag-line tension to control a suspended load, the number of handlers at a safe per-person pull.
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.
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.
Spreader Bar vs Lifting Beam Below the Hook - Top sling tension, spreader-bar axial compression, lifting-beam bending moment.
Spreader Beam Minimum Top-Point Height - The minimum top-point height so the top-sling tension stays within the sling WLL.
Forklift Load-Center Capacity Derate - Net forklift capacity at the actual load center from the data-plate rating, a pass / fail against the load.
Roller / Skate / Jacking Push Force - Steady and breakaway push force to move a load on rollers or skates, the grade component.
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.
Guy-Wire / Down-Guy Tension and Mast Download - The tension in a guy wire holding a mast, pole, or tower against a horizontal load.
Block-and-Tackle Reeving Line Pull - The pull on the hauling (lead) line of a block-and-tackle or crane hoist reeved with N parts of line.
Rigging Block Redirect Resultant Load - Resultant force on a rigging block and its anchor when a line changes direction.
Max Redirect Angle for a Block WLL - The largest direction change a block or anchor of a rated WLL can turn a line without the resultant exceeding the rating.
Multi-Leg Sling Load per Leg - The tension in each sling leg of a multi-leg lift.
Wire-Rope Breaking-Strength Estimate and WLL - Field estimate of wire-rope breaking strength and its working load limit.
Wire-Rope Diameter for a Required WLL - The wire rope diameter for a required working load limit.
Wire Rope Elastic Stretch Under Load - How much a wire rope stretches under load, for a level pick, a two-crane share, or hoist-rope travel.
Spanned Cable Sag and Tension - The tension a horizontally spanned cable (a tramline, highline, span set, or messenger) develops from its sag.
Spanned Cable Minimum Sag for a Tension Limit - The least sag a horizontally spanned cable can be pulled to before the support (anchor) tension reaches the allowable.
Two-Leg Bridle Leg Tension - Leg tensions, angles, and beam reaction for an asymmetric two-leg bridle.
Three-Point Bridle Leg Tension (3-D) - The exact leg tensions of a three-point bridle from the apex load and each leg's east / north / rise offsets.
Beam Clamp Reaction and Side-Pull Check - What a bridle leg actually does to the clamp.
Wire-Rope Clip Count and Spacing (OSHA Table H-2) - The minimum U-bolt wire-rope clips and their spacing to form a load-bearing eye.
Winch Drum Line Pull by Layer - Derated line pull and increased speed of a winch drum at a given rope layer.
Crane Outrigger Reaction from Lift Geometry - The maximum single-outrigger reaction over a corner from the gross load and radius, counterweight.
Crane Load Radius and Boom-Tip Height from Boom Geometry - Turns the boom-angle-indicator reading into the load RADIUS the load chart is indexed by.
Lifting Lug / Padeye Pin-Hole Check - Checks an engineered lifting lug or padeye against all four ASME BTH-1 pin-hole failure modes.

Rigging and Heavy Lift

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