Broderson IC-200-2J - Boom Extension Capacity Examples

2-22
CAPACITY EXAMPLES FOR BOOM EXTENSION
The BOOM EXTENSION ANGLE and the LOAD RADIUS capacity charts must both be
considered when using the boom extension. The smaller capacity specified by the 2 charts
must be used. Refer to the IC-200-3J, Capacity Chart on page 2-14 for the following
examples:
In this first example the boom is elevated to 30° over the side of the crane. The boom
extension is offset to 15°, and the load radius is 32 feet (10.0 m). The outriggers are fully
extended on concrete pavement and the crane is level. The column for BOOM EXTENSION,
ON OUTRIGGERS 360° shows the capacity at the 32 foot (10.0 m) load radius to be 4550
pounds (2010 kg). The column for BOOM EXTENSION, MAIN BOOM ANGLE 30° shows
the capacity at the 15° boom extension angle to be 3000 pounds (1369 kg). Since 3000
pounds (1360 kg) is less than 4550 pounds (2010 kg), the load (including the downhaul
weight and slings) must be limited to 3000 pounds (1360 kg).
In the second example the boom is elevated to 40° over the side of the crane. The boom
extension is offset to 0°, and the load radius is 38 feet (12.0 m). The outriggers are fully
extended on concrete pavement and the crane is level. The column for BOOM EXTENSION,
ON OUTRIGGERS 360° shows the capacity at the 38 foot (12.0 m) load radius to be 3500
pounds (1500 kg). The column for BOOM EXTENSION - STRAIGHT OR OFFSET, MAIN
BOOM ANGLE 40° shows the capacity at the 0° boom extension angle to be 3900 pounds
(1770 kg). Since 3500 pounds (1500 kg) is less than 3900 pounds (1770 kg), the load must
be limited to 3500 pounds (1500 kg).