Single girder gantry crane  also called single girder door crane or goliath crane, it is a kind of track travelling mid-light type crane, can be used where overhead runways are not practical, or in open areas where columns cannot be accommodated. The top main girder is mounted on two A shape columns which are further resting on wheel mounted end carriages.
It is especially suitable for the task of loading and unloading long and bulk material and steel, pipes. It also can be used together with other lifting appliance for special purpose.