MAINBOOMLENGTH

Terms To Know

NOTE: The information in the following paragraph is an example of how to compute a lift. The numbers used in the example may not coincide with the load chart in the crane cab.

Problem: A concrete beam weighing 2268 kg (5000 lbs) needs to be lifted to a height of 9.1 m (30 ft) at a radius of 15.2 m (50 ft) (maximum). The range diagram indicates the boom must be extended to 18.9 m (62 ft) in order to reach a height of 9.1 m (30 ft) at a radius of 15.2 m (50 ft).

First we need to check the crane for load handling devices. In our example, the crane is equipped with a auxiliary boom nose (rooster sheave) and a five ton overhaul ball. The rooster sheave is 50 kg (110 lbs), and the overhaul ball is 78 kg (172lbs) for a total of 128 kg (282 lbs). The lift requires slings and spreader bars weighing 159 kg (350 lbs) which makes the total weight for the load handling devices 286 kg (632lbs).