The short answer: crane selection is driven by the lift, not by the crane. Start with the heaviest and most awkward load, its radius and height, then work backwards to capacity, boom length, outrigger space and road travel. A crane that is slightly larger than the calculation is safer than one that is exactly at its limit.
1. Define the lift
- Heaviest load and its dimensions
- Lifting radius from crane centre
- Required hook height
- Number of lifts and frequency
- Whether the load is regular or irregular
2. Check capacity at the actual radius
Crane capacity is not a single number. It depends on radius, boom length and configuration. A crane rated at a high maximum may lift far less at a long radius. Always ask for the load chart at your actual working radius and height, and keep a safety margin.
3. Site access and setup
- Road access for the crane and support vehicles
- Outrigger footprint and ground bearing capacity
- Overhead obstructions and power lines
- Setup and dismantling space
- Ground conditions in wet weather
4. Travel and mobilisation
Truck cranes can travel on public roads, which reduces mobilisation cost compared to crawler cranes. Confirm axle loads, permit requirements and travel speed with your supplier and local authorities. For remote sites, confirm fuel, support vehicles and escort requirements.
5. Safety planning and people
- Prepare a lift plan and risk assessment.
- Confirm operator certification and experience.
- Define exclusion zones and signalling.
- Inspect rigging and accessories.
- Agree on weather limits and stop criteria.
6. What to include in your RFQ
- Load details and lift radius
- Required hook height and reach
- Site location and access
- Ground conditions
- Duration and number of lifts
- Service, spares and operator support
Kiswahili summary
Chagua crane kwa kuanza na lift halisi: mzigo, radius, height, kisha capacity, boom, outriggers na access. Crane kubwa kidogo kuliko mahesabu ni salama zaidi.