Definition(s)
“Lazy S” riser
The “lazy S” riser runs in a double catenary configuration from the FPS to the seabed over a mid-water pipe tray supported by a subsurface buoy. The subsurface buoy is kept in position by a chain or cable attached to a deadweight anchor positioned on the seabed.
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards