2-22
CAPACITY EXAMPLES FOR BOOM EXTENSION
The BOOM EXTENSION ANGLE and the LOAD RADIUS capacit y charts must both be
considered when using the boom extension. The smaller capacity specified by the 2 charts
must be used. Ref er to the IC-200-3H, Capacity Chart on pag e 2-15 for the following
examples:
In this first example the boom is elev ated to 30° ov er the side of the crane. The boom
extension is offset to 15°, and the load radius is 32 f eet (10.0 m). The outriggers are fully
extended on concrete pavement and t he crane is lev el. T he column for BOOM
EXTENSION, ON OUTRIGGERS 360° show s the capacity at the 32 foot (10.0 m) l oad
radius to be 4550 pounds ( 2010 kg). T he 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 t han 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 of fset to 0°, and t he load r adius is 38 f eet (12.0 m). T he outriggers are fully
extended on concrete pavement and t he crane is lev el. T he column for BOOM
EXTENSION, ON OUTRIGGERS 360° show s the capacity at the 38 foot (12.0 m) l oad
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).
Courtesy of Crane.Market
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