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What is the difference between net load and gross load in crane operations?

Net load is the weight of the object being lifted. Gross load includes the net load plus the weight of all rigging equipment (slings, shackles, spreader beams, lifting beams). The crane's rated capacity must be compared against the gross load.

What is a critical lift and when is it required?

A critical lift is defined as any lift exceeding 75% of the crane's rated capacity, or involving multiple cranes, or lifting personnel, or lifting over active equipment. Critical lifts require a written lifting plan signed by an Appointed Person (AP) per BS 7121.

What is outrigger bearing pressure and why does it matter?

Outrigger bearing pressure is the force exerted by each outrigger float on the ground. It is calculated as the maximum reaction force divided by the outrigger pad area. The ground bearing capacity must exceed this pressure, or timber mats/steel plates must be used to distribute the load.

What crane load chart should be used for capacity calculations?

Always use the manufacturer's load chart for the specific crane model and configuration. The chart provides rated capacity at various boom lengths and working radii. Never exceed the rated capacity shown on the load chart for any configuration.

crane lift · Engineering Calculator

Crane Lifting Plan Calculator for 5-Ton Steel Beam with Outrigger Bearing

Formula

Utilization = (Gross Load / Rated Capacity) × 100%

Governing Standard

ASME B30.5 — Mobile and Locomotive Cranes, and BS 7121

Required Inputs

Net Load (beam weight) in tons
Rigging Weight (slings, shackles, spreader) in tons
Crane Rated Capacity at working radius in tons
Working Radius in meters
Boom Length in meters

Output

Capacity Utilization Percentage and Lift Status (Green/Amber/Red)

Notes

For a 5-ton steel beam with 0.3 tons of rigging, gross load = 5.3 tons. If the crane's rated capacity at the working radius is 8 tons, utilization = 66.25% (Green — safe lift). If utilization > 75%, the lift is classified as 'critical' and requires an Appointed Person sign-off. If > 90%, the lift is 'overload' and must not proceed.

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