Fixed crane is fixed on the base or the supporting base, can work only be in place, the operation range is small. Optional sling hook, grab. It More be used for river port .

Portal crane is the general crane for the regular bulks and sundry terminal aprons.

It can be to walk through the metal wheels on the rail. The work range is 

wider than fixed portal crane. It can be also used in the shipbuilding and 

ship repairing factory ,marine engineering.