Tower Cranes
Synthetic Slings
This requirement appears in section 1404(r) but bears repeating here: when using synthetic slings during erecting, climbing, and dismantling, you must follow the synthetic sling manufacturer's instructions, limitations, specifications and recommendations.
Synthetic slings must be protected from abrasive, sharp or acute edges, and configurations that could cause a reduction of the sling's rated capacity, such as distortion or localized compression.
Safety Devices
Different safety devices than those specified in section 1415 are required on tower cranes. Those required on tower cranes are:
- boom stops on luffing boom type tower cranes
- jib stops on luffing boom type tower cranes if equipped with a jib attachment
- travel rail end stops at both ends of travel rail
- travel rail clamps on all travel bogies
- integrally mounted check valves on all load-supporting hydraulic cylinders
- hydraulic system pressure limiting device
- the following brakes, which must automatically set in the event of pressure loss or power failure, are required:
- hoist brake on all hoists
- swing brake
- trolley brake
- rail travel brake
- deadman control or forced neutral return control (hand) levers
- emergency stop switch at the operator's station
- trolley end stops at both ends of travel of the trolley
Knowledge Check Choose the best answer for the question.
7-2. Which of the following are safety devices required on tower cranes?
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