An off-centre equipment lift
A lifting plan treats an equipment package as a six-thousand-kilogram load supported at two points four metres apart. Its stated centre of gravity is one metre from the left point, so the vertical shares are not equal. The sling legs will be inclined and must be selected using the actual geometry and equipment ratings. The crane chart for the planned setup defines gross suspended load to include the hook block and rigging. The proposed travel crosses an area beside an old service trench, and the operator loses direct view during part of the swing. The package must land on prepared supports before it is disconnected. The team needs to check the calculation basis, support conditions, communication, and final transfer rather than rely on the crane's advertised maximum capacity.
1. Find the simplified vertical share at each lifting point and explain the limitation of that result.
Read the worked answer
Moment balance gives 1,500 kilogram-equivalent at the right point and 4,500 at the left. These are static vertical shares, not final sling tensions or lift authorization. Actual sling geometry, rigging mass, ratings, dynamic conditions, and the approved plan still govern.
2. Identify the additional checks that matter before and during the lift.
Read the worked answer
Match the crane chart to its configuration and apply gross-load deductions. Verify ground support near the trench, establish reliable blind-lift signalling, and plan stable landing and restraint. A trial lift should confirm control, and rigging should remain until the required load transfer is secure.