There is a common misconception that single girder cranes have a lower duty cycle than double girder cranes. This is simply untrue as a single girder crane with FEM2m classification is equal in terms of duty to a double girder of the same classification. Sounds obvious, right?
So where does this misconception come from? Single girder cranes have a general capacity cap of around 20 tons, although larger ones can be produced. So single girder cranes have a lower load spectrum, but are not lower duty by virtue of their configuration.
What will then inform the decision around whether you need a single girder or double girder crane configuration? The truth is that the best configuration comes down to the specific of your application and job site, including factors such as below-rail headroom or above-rail clearance. A skilled sales engineer will be able to equip you with all the options available to you that are possible within the limitations of your existing building and according to your desired needs.
As mentioned above, a single girder crane does have a limit on capacity and is generally less expensive than its double girder counterpart. Double girder cranes have higher capacity capabilities and lend themselves to functions that include an auxiliary hoist for applications such as turning of material. The list of definitive differences between single and double girder configurations is numerous and it will most definitely help to start having the discussion around this important decision as early in your project as possible.
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