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Cranes and their components are not designed to last forever. Welded structures and machinery components experience fatigue and wear-and-tear whenever a crane is working. These components have a finite service life – which is correlated to usage, not calendar time.

Structures consume their design life in work cycles, while machineries consume their design life in running hours.

Both structures and machineries take the load into account – half the rated load consumes design life by a factor of 0.125.