Single Girder Cranes have lesser weight because there is only one cross girder, the weight is lesser compared to 2 girders in Double Girder Cranes.
The Hoisting Mechanism is simple as it is a standard hoist, being modular weight of the Hoist is much lesser than its counterpart in Double Girder Cranes.
The platform as in Double Girder Cranes is not feasible in Single Girder cranes
Due to lower weight of the Single Girder Crane the price is lower, the supporting structure i.e gantry girders, columns and overall building size can be reduced.
Maintenance is difficult as there is no platform / accessibility.
The lifting height is reduced compared to a similar double girder Crane
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