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STAHL CraneSystems is the specialist for high-performance cranes in the upper S.W.L. range. This naturally includes the double girder overhead travelling crane with an S.W.L. of up to 160,000 kg and a span of up to 30 m. Large, unwieldy loads can be handled extremely safely and accurately. This is particularly true when several hoists equipped with a precise electronic synchro control are used in tandem operation.
The double girder overhead travelling crane can be integrated into planned or existing buildings utilising special installation variants. The top hook position brings particular advantages on a double girder overhead travelling crane. The load hook is lifted between the crane girders. Additional requirements such as maintenance platforms on crab or crane, cabins or higher crane travel speeds can be achieved quickly and easily.
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Girder Stength
A common misconception is that double girder bridge cranes are more durable. Based on the CMAA (Crane Manufacturers Association of America) specifications, both single and double girder cranes are equally rigid, strong, and durable. This is because single girder cranes use much stronger cross girders than double girder cranes, and single girder cranes have lateral bracing.
The Difference is in Hook Height
The principle difference between single and double girder cranes is hook height (how far above the floor your hoist will lift). Double girder cranes provide better hook height. Double girders typically allow 18-36 inches higher lift.
Double girder cranes can provide more lift, because the hoist is placed between the cross girders rather than under them. Therefore, the depth of the cross girder is gained in switching to double girders.
Cost Considerations
Single girder cranes may cost less for several reasons:
Only one cross girder is required
The trolley is simpler
Fright expenses are reduced
Installation is faster
Runway beams are lighter
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Double Girder Bridge Cranes - XMD
The double girder construction of the XMD enables this crane to handle bigger loads and longer spans than the single girder design. The XMD has a lower construction height than the XMS, thus maximizing the available workspace. The XMD crane incorporates all the features common to the XM profile.
Smooth and silent load handling and long suspension distances
Load range 125 - 2000 kg
Three different configurations:
- Articulated
- Rigid for mainly motorized version
- Low headroom to maximize hook clearance
Hand operated or motorized trolley and bridge
Easy expansion
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Twin girder crane
A twin girder crane system is the heavy-duty choice. The twin girders are welded together in a triangular construction to stabilize operation when handling loads up to 1500 kg. The twin girder crane is optionally equipped with motorized trolleys to automate the traveling motion of the girder and/or hoist. The two-speed motorized trolleys can be equipped with a frequency converter for more options.
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