Liwan 3-1 3rd Party Verification
Liwan 3-1 3rd Party Verification: Jacket Design and Float-Over Installation
• Timeline: 2010
• Location: South China Sea
• Water Depth: 200m
• Operator: CNOOC
• Client: COOEC
Project Description:
Liwan 3-1 is China’s first deepwater project with an estimated contingent reserves of between 4 trillion and 6 trillion cubic feet of gas. While the deepwater depths approach 1500m, the Central Processing Facility sits in 200m depth and is connected to the field via a 100km subsea pipeline. It is estimated that the jacket is the largest single piece jacket.
ODL Scope of Work:
ODL was contracted to complete a 3rd party verification of the basic design of the Liwan 3-1 jacket and to design the float-over installation of the Central Processing Facility.
Key Details:
- ODL reduced the jacket weight by 6,000mt creating a significant cost savings on steel tonnage and construction costs for CNOOC.
- The outside diameter of the piling is of the largest in the world at 108 inches.
- The topsides transportation weight of 27,000mt is one of top 5 heaviest transports in the world. The not to exceed in-place topsides weight is 40,000mt.
- The jacket is the third largest single piece jacket in the world at 32,000mt. It is the largest conventional steel jacket outside the Gulf of Mexico.
- ODL will complete an evaluation on the HYSY229 barge to re-configure the dimensions of the barge.
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