Lifting Operation Planning Guide
A lifting operation begins before the crane arrives. The planner must know the load, rigging, site limits, and people involved. This calculator helps convert those details into clear planning numbers. It estimates gross load, dynamic load, sling tension, capacity use, wind force, center of gravity effects, and ground pressure. The results are not a permit. They are a structured check for early review.
Why Load Weight Matters
Every lift starts with the item weight. Rigging gear, spreader beams, shackles, hooks, and temporary attachments must be added. A dynamic allowance is then applied. This covers controlled movement, small shocks, and normal handling effects. Heavy lifts often need conservative values because small errors create large forces.
Sling Angle and Tension
Sling angle changes leg tension. A low angle creates high tension. This can overload slings, shackles, lugs, and pad eyes, even when the crane has enough capacity. The calculator uses the angle from the horizontal. A steeper angle improves sling efficiency. A shallow angle needs review, redesign, or a spreader beam.
Crane Capacity Review
Crane capacity depends on radius, boom length, setup, counterweight, ground, and chart notes. This tool compares factored load against the capacity entered by the user. Always enter the correct chart value for the exact configuration. Do not use a maximum headline capacity for a different radius.
Site and Weather Checks
Wind can affect large panels, tanks, containers, and sheeted loads. The wind estimate uses exposed area, wind speed, and drag coefficient. Center of gravity offset is also important. Offset creates moments that can tilt, rotate, or overload pick points. Ground pressure is estimated from support area. Actual outrigger reactions may be higher.
Safe Use of Results
Use the output to prepare lift plans, toolbox talks, and engineering reviews. Check each value against approved drawings, certified rigging, crane charts, and site rules. Stop when any value exceeds limits. Ask a competent lifting person to verify critical lifts. Careful planning keeps lifting operations controlled, documented, and safer for crews.
Documentation
Record assumptions, input sources, inspection notes, weather limits, and approval names. Keep the report with the lift plan. When site conditions change, revise the numbers before any movement starts near people or assets on the site.