Low Ball Construction Co. has determined that the heaviest load to be lifted on one of their projects weighs 22,000 lb. From the tower crane location on the building site, the required reach for this lift will be 100 ft. The crane is equipped with a L7 jib and a four-part hoist line (see the Table 17.3 load chart). This critical lift is of a piece of mechanical equipment and will require a 1,000-lb spreader bar attached to a 200-lb set of slings. If assembled in the proposed configuration, can the crane safely make the pick?
Load: | 22,000 lb |
Spreader bar: | 1,000 lb |
Slings: | 200 lb |
| 23,200 lb |
Safety factor | × 1.05 |
Required lift capability | 24,360 lb |
From Table 7.3, at 100 ft – 9 inches reach with a four-part line and a L7 jib configuration the tower crane has a 22,600 lb capacity.
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