FSO Pathumabaha External Turret
Scope of Work
SOFEC designed and constructed an external turret mooring system for a MODEC purpose-built 60,000 dwt FSO in 78m water depth in the Bongkot Gas Field, Gulf of Thailand. Two 6-in. submarine hose risers, one duty and one spare, and one umbilical are connected from the external turret of the FSO to the PLEM located on the seafloor.
The SOFEC external turret mooring system is ABS classed.
General Description
| Client Name: | Consortium of Total, British Gas and PTT Exploration & Production (PTTEP) |
| Contract Award: | August 2001 |
| Installation Date: | January 2003 |
| First Oil: | January 2003 |
| Vessel Size: | 60,000 dwt |
| Storage Capacity: | 400,000 bbls |
| Water Depth: | 78m (256ft) |
| Fabrication: | Turret - China Vessel - China Topsides - China |
Design Environmental Criteria
(100-year storm)
| Significant Wave Height: | 7.9m (26ft) |
| Wind Velocity: | 37m/s (72 knots) |
| Current: | 1.3m/s (2.53 knots) |
Mooring System
Turrets
8-leg Symmetrical mooring:
3.5-in. mooring chain (110m) Top chain
3.5-in with 4-in. insertions (80m) Excursion limiter
142mm (109m) Drape chain
3.5-in. (400m) Ground chain
Pile
External Cantilevered Bow
Fluid Swivel Assembly
| Production: | 2 x 8-in. toroid (740 psi design) |
| Hydraulic Swivel: | 6 path (3,000 psi design) |
Riser System
2 x 6-in. Flexible riser