TOWER CRANES
Out in the cold
selected steel mills must exceed the requirements of regional certification and be verified through the Manitowoc global supplier audit system. Advanced torque and loading technology Cement, sand, steel and other site materials come in all different weights and sizes and won’t always be accurately measured ahead of lifting. The challenge of moving these materials is then often exacerbated by high winds. This is where Potain’s advanced torque and load-limiting technology plays an important role. The torque limiter on Potain tower cranes prevents them from lifting or moving the load forward when the specified tilting torque is exceeded. This prevents damage due to excessive torque during the operation. In addition, Potain’s load-limiting device protects the hoist mechanism from overloading and prevents damage to the wire rope.
Five ways Manitowoc’s advanced engineering design helps Potain cranes thrive in extreme temperatures. One of the biggest threats to the progress of construction projects is extreme weather and its damaging impact on on-site equipment, including cranes. This is especially true of winter weather where temperatures can fall as low as -20˚C in some parts of the world. To operate in such an environment, it's important to ensure that equipment is high quality, well maintained and able to withstand high winds and sub-zero temperatures. Here we look at five ways Potain’s top-quality engineering optimizes 38
Lifting Africa - Nov/Dec 2021
crane efficiency in cold weather. High-quality steel A tower crane's main metal structure is steel; the jib, tower top, turntable, cap, balance arm and underframe all comprise metal materials produced by welding. High specification steel is essential to ensure the safety and efficiency of these structural components and provide a high level of resistance to freezing temperatures. Potain cranes are produced from low-alloy high-strength industrial steel of the highest grades. Before any steel can be supplied to Manitowoc for use in Potain cranes,
Better steel design Seamless round steel designs, as seen in the jib sections of Potain cranes, are scientifically proven to offer more reliable performance than steel sections with angles. The circular design allows the jib to withstand extreme forces and tension. Comprehensive testing All Potain crane designs undergo a rigorous testing process at our Product Verification Centers where they are exposed to various workload stresses. This includes a controlled corrosion test environment along with a temperature and humidity chamber to constantly improve crane design for all weather conditions, including extreme cold. High-quality components Faulty crane components may not always be spotted immediately, especially those in the air on a tower crane. Wire rope damage, brake failure, bolt and pin connection failure and weld cracking can all cause operational faults and delay progress on the Jobsite. Connector corrosion is
