Subsea Tieback Installation and Hook-up Activities Completed

During 4Q the Saipem Constellation vessel, referred to as SCON, completed the final riser recovery and hookups to the Liza Destiny FPSO. Risers connect the flowlines from the sea floor to the FPSO on the surface. Recovery and hookup of the risers requires significant planning to ensure safe and seamless operations, especially during periods of heavy simultaneous operations (SIMOPS). The SCON vessel is equipped with Remotely Operated Vehicle, or ROV, technology that enables operators to perform tasks on the sea floor such as location and recovery of the risers. Once the risers are recovered, the flex joint is welded to the riser and then the riser is transferred to the FPSO. The riser pull-in system is then engaged to complete the riser installation and transfer to the FPSO. Click here for a video with more details on the SCON riser recovery, welding, and transfer work. Once the risers are recovered.

Also, during the 4Q the Skandi Neptune completed the installation of the remaining flowline jumpers for the subsea manifolds. The jumpers are pipe connectors that are used to transport fluids between the subsea flowlines and manifolds.  In order to prepare for first oil, hydrotesting of all of the flowlines and risers was performed. Hydrotesting verifies that an installed pipeline system is fit for service. It is used to detect any possible leaks in the flowlines and risers and serves as a final check of the integrity of the constructed system prior to the introduction of hydrocarbons.