![]() ![]() There is no industry standard for the tonne-metre ratings! However as the name 100B indicates, many tower crane manufacturers choose type classifications related to the load moment for their crane range, giving a rough orientation about the capacity of the crane.Ĭarsten Bohnenkamp, technical director, Potain, France Therefore it provides a maximum load moment of 144tm or 1440kNm. ![]() For example, the Wolff 100B luffing jib crane can handle 6t at a maximum radius of 24m. This does not necessarily indicate the maximum load moment provided by the crane, which is made up of the maximum radius at which the maximum capacity can be lifted with the shortest jib and maximum falls. For example, the Wolff 100B is placed in the 100tm class, as it lifts a maximum of 2.5t at 40m radius. This factor simply multiplies the maximum lifting capacity with the associated radius. Unlike mobile cranes - where the maximum capacity without correspondence to any working radius is used - for tower cranes, the load moment related tm class is used. Heinz-Gert Kessel, tower crane correspondent, Cranes Today, Germany A reader of Cranes Today recently asked: "Is there an industry wide accepted definition of the tonne meter classification of cranes?" Cranes Today put the question to two tower crane experts. ![]()
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