In container yards, we find mainly two types of gantry cranes, namely rail-mounted gantry (RMG) cranes and rubber-tired gantry (RTG) cranes, which are used to lift and relocate shipping containers. The choice of the perfect gantry crane will depend on a number of factors including the yard layout, size and operation. RTG cranes, as the name indicates, come equipped with rubber tires that promote free movement of the crane through the container yard. However, the rubber tires have their own limitations with regard to the size and lifting ability of the RTGs. On the other hand, the RMG cranes are designed to move on rails and hence, they cannot be made to move freely around stacks in the container yard. However, because the RMGs are equipped with steel wheels, they can carry greater weight compared to RTG cranes.
The higher load-bearing capability of the steel-wheeled RMG cranes makes them an option that can be modified very easily in terms of design. You can get a number of rail configurations installed to the RMG cranes to promote its versatile use in an intermodal container yard. An RMG can be made to cover more than 300 feet with cantilevers being used to lengthen an RMG’s range and with the average distance between the legs being 150 feet. An RMG crane can cover eight rail tracks as well as the stacking sections. Notably, they can be made to reach drive lanes for trucks as well.
However, when you deploy RMG cranes as the major relocation tool in your intermodal facility, you need to take additional precautions to ensure proper equipment upkeep. In the event of an outage, you may need to keep your operations halted for some time until you get your RMG crane repaired. There are chances that your RMG crane breaks down right in the middle of your site that remains busy throughout the entire day, demanding you to take quick actions to restore your operations to their full potential. RMG cranes are noted for their greater efficiency compared to RTG cranes and they are powered completely by electricity.