Single Line Offset Riser:
A Single Line Offset Riser (SLOR) is generally a free standing piece of pipe that is anchored at the bottom to the seabed and supported at the top by a buoyancy can. The top of the riser is 150-300 feet below water surface and connected to the host vessel by a flexible jumper. The jumper connects to a gooseneck assembly on the riser. A buoyancy can supports the weight of the riser. A tapered stress joint (keel) transfers the load from the can to the riser. The riser continues down to an offtake spool and lower stress joint. The lower stress joint allows the load to be transferred to the anchoring system and the offtake spool contains a connector for a jumper to a flowline PLET.
The SLOR can be installed from a pipeline installation vessel in J-lay, S-lay or also from a drilling derrick. The riser and lower assembly are lowered down and connected to the seabed while the buoyancy is attached to support the riser. Since the SLOR can be installed without a host, topside flexible jumper connections can be made after host arrival allowing the decoupling the schedule of host arrival and riser installation. These connections may also be disconnected later if host facility changes or moves.