Midwater arch system

The invention provides a mid water arch (MWA) buoy for flexible riser arrangements, for lifting and installation, with anchors connected, in one operation, the mid water arch buoy (MWA) comprising: a gutter, a loadbearing structure, buoyancy elements, lifting lugs for attachment to a crane, and anchoring lugs for attachment to an anchor wire, distinguished in that the lifting lugs and anchoring lugs are common or are arranged above and under horizontally extending elements of the loadbearing structure, so that the loadbearing structure is in substance independent of the lifting forces except of compression components thereof, wherein the buoyancy elements comprise three or more gas filled pressure vessels, said pressure vessels are without bulkheads.