When lifting a tank, for example, the lift director needs to account for the weight of any fluid still in the tank. The accuracy of the LMI directly correlates to the accuracy of the information inputted, which is why a crew should avoid doing a lift without the correct weight information. The LMI provides the crane operator with a continuous readout of the boom angle, radius and length. STEPS FOR SAFE OPERATIONĬrane operators need to be sure that they’re programming the right information into the load movement indicator (LMI). However, with the right planning, the factors that lead to an overloading accident can be lessened or eliminated altogether. The majority of the time, accidents are caused by an error made by the crew at the end of a long, difficult shift while workers are tired and no longer mindful of detail. Mobile cranes can be equipped with either lattice jibs, articulated jibs or telescopic jibs-or a mixture of several jib types.Īlong with their flexibility, the fact that these cranes are so popular means that crews can get lax with load calculations. When in fixed positions, outriggers and other additions can sustain these self-powered jib cranes to provide stability. They can travel on crawlers or tires, with or without a load. Mobile cranes are the backbone of modern-day construction. When a crane operator tries to lift a load greater than the crane’s weight capacity, the results can be disastrous. Reports of mobile crane accidents that are a result of overloading tend to make national news.
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