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FPSO Nan Hai Sheng Li Internal Permanent Turret

 
 
FPSO Nan Hai Sheng Li Internal Permanent Turret Image
 
 

Scope of Work

SOFEC designed, constructed, and installed an internal permanent turret mooring system for the MODEC-converted 140,000 dwt Nan Hai Sheng Li FPSO.

The permanent turret mooring system installed in the FPSO enables the tanker to remain on station during 100-year typhoon conditions characterized by wave heights up to 13.2m, currents more than 3 knots, and 87 knot winds. The Liuhua 11-1 field is located in Typhoon Alley offshore, southeast Hong Kong, PRC. The Nan Hai Sheng Li FPSO survived a direct hit by Super Typhoon Sally in 1996. The FPSO has a design life of 15 years.

The dual toroidal swivel system on this FPSO, as well as the piping and riser systems, was designed for H2S service.

FPSO Nan Hai Sheng Li Internal Permanent Turret Location Image
 
 

SOFEC designed, constructed, and installed an internal permanent turret mooring system for the MODEC-converted 140,000 dwt Nan Hai Sheng Li FPSO.

The permanent turret mooring system installed in the FPSO enables the tanker to remain on station during 100-year typhoon conditions characterized by wave heights up to 13.2m, currents more than 3 knots, and 87 knot winds. The Liuhua 11-1 field is located in Typhoon Alley offshore, southeast Hong Kong, PRC. The Nan Hai Sheng Li FPSO survived a direct hit by Super Typhoon Sally in 1996. The FPSO has a design life of 15 years.

The dual toroidal swivel system on this FPSO, as well as the piping and riser systems, was designed for H2S service.

FPSO Nan Hai Sheng Li Internal Permanent Turret Location Image
 
 

General Description

Client Name:Amoco Orient Petroleum Co.
Contract Award:July 1993
Installation Date:March 1996
First Oil:April 1996
Vessel Size:140,000 dwt
Storage Capacity:650,000 bbls
Water Depth:305m (1,000ft)
Fabrication:Turret - Japan
Vessel - Singapore
 
 

Design Environmental Criteria

 
 

(100-year storm)

Significant Wave Height:13.2m (43.2ft)
Wind Velocity:45m/s (87 knots)
Current:2.26m/s (4.39 knots)
 
 

Mooring System

Turrets

 
 

10×1 chain-wire-chain with subsea buoys (inverted
catenary mooring):
4.5-in. ORQ +20% chain
4.5-in. Spiral strand wire rope
Syntactic foam support buoys
40mt High holding power anchors

Internal Permanent Bow

The 6.5m internal turret houses a four-pass swivel, with toroidal passages for two production lines, one test line and one spare line. A hydraulic swivel for control lines is also included. Hydraulically activated emergency shut down valves were placed below the swivel as part of the FPSO safety.

 
 

Fluid Swivel Assembly

2 x 12-in. 300# ANSI flange connection (740 psi design)
 
 

Riser System

 
 

2 x 13.5-in. Flexible riser
1 x 6-in. Flexible riser

 
Download Spec Sheet
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