Crane Operation, Travel, Slewing and Load Control
Smooth, controlled motions
Good crane operation is about controlling momentum. Start and stop hoist, slew and luffing motions smoothly to limit load swing. Keep the load as low as practical, use taglines where needed, and plan the path so the load does not pass over people. Traps in questions include slewing too fast and relying on the brake to stop swing, hoisting before the load is clear, and travelling with a raised load when procedures require it lowered.
Travel and portal-specific risks
Portal cranes travel on rails or bogies. Before travelling, confirm the path is clear, rail clamps and anchors are released correctly, end stops are intact, and wind speed is within limits. Travel with the boom in the prescribed position and the load secured. Watch for the portal striking structures or people in the straddled area.
Wind and environmental limits
Wind acts on the load's sail area, increasing radius and overturning moment. Follow the manufacturer's wind limits and stop when gusts exceed them. Also monitor visibility, lightning and ground conditions.
Load control techniques
Use gentle counter-motion to damp swing, keep the hoist rope vertical over the load's centre of gravity, and use a spotter with agreed signals for blind lifts. Never drag or side-load the boom.
Worked rule of thumb
Plan each motion: "clear the path, lift just clear, slew slowly, lower positively." If the load swings, stop and let it settle rather than fighting it with rapid inputs.