Mae yna dri math o lif gwaith ar gyfer y hopranau porthladdoedd:
Grab ---- hopper --- tryc --- warws
Grab --- hopper --- cludwr --- silo
Grab --- Hopper --- pacio
Mae yna dri math o lif gwaith ar gyfer y hopranau porthladdoedd:
Grab ---- hopper --- tryc --- warws
Grab --- hopper --- cludwr --- silo
Grab --- Hopper --- pacio