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Rigging Engineering Calculations: A Practical Guide (ITI)

: For winch systems, this includes friction allowances. Formula : Recommended Reference Materials

T=Load WeightNumber of Slings×Sling Angle Factor (SAF)cap T equals the fraction with numerator Load Weight and denominator Number of Slings end-fraction cross Sling Angle Factor (SAF) The Sling Angle Factor is calculated as: Rigging Engineering Calculations: A Practical Guide (ITI) :

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Outlining exact boom lengths, counterweight configurations, radius boundaries, and quadrant of operation. A Design Factor (or Safety Factor) is applied

Typically utilizes a 5:1 design factor. 2. Fundamental Rigging Calculations and Formulas

Rigging components are rated based on their Ultimate Tensile Strength (UTS). However, engineers never operate gear at its breaking point. A Design Factor (or Safety Factor) is applied to establish the Working Load Limit (WLL). the load will tilt

You decide to use a 2-leg bridle sling, with each leg at a 60° angle from horizontal. Your PDF provides the Angle Factor for a 60° angle as 1.73 . The tension on each leg is calculated as: Tension = (Load / 2) × Angle Factor = (1200 lbs / 2) × 1.73 = 600 lbs × 1.73 = 1038 lbs per sling leg .

The Center of Gravity is the single point in a load around which its weight is evenly distributed. Determining the exact location of the CoG is the most critical first step in any lift plan. If the CoG is not directly beneath the crane hook, the load will tilt, shift, or swing violently when lifted. This introduces dynamic forces that can exceed the capacity of the rigging gear or crane. Load Weight Verification

Industry leaders like Crosby, Gunnebo Industries, and Mazzella publish comprehensive corporate catalogs that double as engineering reference books, complete with exact dimensions, reduction factors, and tension tables.

Weight at Point B=Total Weight×Distance from CoG to Point ATotal Distance between A and BWeight at Point B equals Total Weight cross the fraction with numerator Distance from CoG to Point A and denominator Total Distance between A and B end-fraction Spreader Beam Compressive Forces