What is the load moment of a crane?
Cranes are classified according to their tip load of capacity. Moment of a crane depents on its type. Usually moment is calculated by the lenght of its boom multiplied the tip load it carries.
The load moment for a crane is a number measuring the weight of the load lifted times the distance between the mass and the centre of the crane's superstructure. For example, a 20 ton weight lifted at 5m away from the crane (in reality, right next to it!) gives us a load moment of 100 ton*m, the same as a 10 ton weight lifted 10m from the crane. Cranes can handle higher load moments closer to the crane, so really heavy lifts are always done from very close to the load.
