Introduction Double girder gantry crane is heavy gantry crane with double girders, which is widely used for general purpose. Double girder gantry crane are heavy duty crane, used at indoors and outdoors places where overhead crane�runways are not practical. The lifting capacity of the double girder gantry crane is 5 to 500 tons. The working class of the gantry crane is A5 and A6. Application of Double Girder Gantry Crane: Double girder gantry crane is usually used to open warehouse or along rail for general material handling and lifting work, such as, freight yard or dock, etc.