|Publisher||Offshore Technology Conference||Language||English|
|Content Type||Conference Paper|
|Title||Design, Fabrication, and Installation of the Neptune Export Lateral PLETs|
J. K. Antani, Enbridge Offshore Pipelines LLC; W. T. Dick, Enbridge Offshore Pipelines LLC; D. Balch, Pegasus International Inc; T. van der Leij, Allseas USA Inc
Offshore Technology Conference, 5-8 May 2008, Houston, Texas, USA
2008. Offshore Technology Conference
|4.5.5 Offshore Pipelines
The Neptune export PLETs incorporate subsea wyes, valves and connector hubs, and provide spare oil and gas connection hubs for tie-in of future laterals, at the same locations in block GC 650. The P3 and P7 PLET design incorporates provisions for the safe passage of pigs specially designed to traverse multi-diameter pipeline systems. This Paper describes the design, fabrication and installation of the Neptune oil and gas export lateral PLETs in 4200 ft depths in Green Canyon Block 650, Gulf of Mexico.
To ensure a low center of gravity, the wye is oriented horizontally, and the mudmat is attached to the bottom of the PLET framing. This assists in minimizing pipeline bending moment at the PLET/pipeline interface, and in mitigating rotation tendency of the PLET as it is lowered from the surface to the seabed. The water depth for the gas PLET P3 is 4221 ft, while the oil PLET P7 is in 4267 ft depth.
|File Size||3,271 KB||12|