Liebherr has uprated the nominal capacity of its nine axle 750 tonne LTM1750-9.1 to an 800 tonner, although it will retain is 1750-9.1 nomenclature.
The company says that the upgrade has been made possible by the use of refined static calculation methods. The changes have also allowed it to improve lifting capacities across almost the entire working range. Owners of the LTM 1750-9.1 will be able to update their crane software with the new load charts, while the new jib system can also be retrofitted to existing units.
The company is also introducing a new luffing jib configuration using existing lattice sections to provide additional capacity increases for wind power applications. The changes allow the crane to lift 79.8 tonnes on a 28 metre jib to a hub height of 90 metres, a 10.7 tonne improvement, while it handle 65.6 tonnes on a 38.5 metre luffing jib at a hub height of 100 metres and a 24 metre radius – an 11.5 tonne increase over the old configuration.
A company statement explained the rationale behind the capacity upgrade as follows: “wide-ranging experience of our design and structural engineers have with thin walled boom profiles has enabled the popular calculation models and approaches of the Finite Element method to be further refined. Supported by high performance computers, the real load bearing structure of the crane is simulated even better in the static calculation model. Liebherr has now transferred the latest findings and methods, which had already been applied in the new LTM 1650-8.1.”
“Thanks to the new luffing fly jib configuration, the LTM 1750-9.1 has moved into a higher load capacity class in the area of wind power applications. So, for example, more than 10 tonnes of additional load capacity can be generated for the mounting of wind turbines on 90 and 100 metre high towers. The LTM 1750-9.1 is also much stronger in the area of heavy load lifting, such as the loading of transformers onto ships, with typical working radii of 12 to 16 metres. The gain in load capacity in such applications is in excess of seven tonnes.”
Liebherr is also now offering load charts for safe operation in three wind speeds.
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