How to understand overhead crane rated capacity?

The definition of rated capacity is a value or quantity establishing the maximum amount that can be contained, accommodated, or handled.As for overhead crane machine rated capacity,you cannot legally exceed the rated capacity of the crane when you use it. 

The most common type of overhead crane used in manufacturing environments is the overhead bridge crane. This crane runs on elevated tracks and is a popular choice because it offers hook motion along three axes—up and down, back and forth, and side to side. These cranes can run either on top of girders or be underhung.

Crane system includes the hoist, crane, runways and runway support system. OSHA/ASME requires the load test to be performed at 120% of full load capacity.

Conversely, you are limited to lifting 5 tons and no more than 5 tons on a 5 ton rated capacity crane. Most new hoists include an electrical overload detection that provides protection against lifts in excess of 110% of the rated capacity. This additional 10% is not what it seems, the initial startup shock will use up most of the 10%. If the overload protection were set to 101%, it would frequently refuse to lift the legitimate 5 ton lifts.

You can safely lift up to the Rated Capacity as marked on the side of the crane. Don’t forget that the below hook lifting equipment is part of the “live load”. In other words, chains, load bars, etc.

Can rated loads for hoists and trolleys be different from the overhead crane’s rated load?

The short answer to your question is “yes.” However, Dongqi stipulates that when a system is comprised of components with different rated capacities, the rated load of the “system” shall be based on the lowest rated individual component.

System is defined as the combination of Monorail, Hoist and Trolley in the case of a Monorail and Crane; Hoist and Trolley in the case of an Underhung Crane.

You must understand the rated capacity of overhead crane,hoists and trolleys now.Dongqi Crane can ensure your working efficiency and safety,Furthermore,We also provide operator training. 

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