Development of load-out design methodology and numerical strength evaluation for on-ground-build floating storage and offloading system
详细信息 查看全文
- 作者：Yang ; Y.T. ; Park ; B.N. ; Ha ; S.S.
- 关键词：Ground build ; Load-out ; Float-off ; FSO construction ; Double Barge Unit (DBU)
- 刊名：Ocean Engineering
- 出版年：2005
- 出版时间：June, 2005
- 年：2005
- 卷：32
- 期：8-9
- 页码：986-1014
- 全文大小：1.59 M
文摘
This paper presents the design methodology and numerical strength evaluation for the Floating Storage and Offloading system (FSO) that was built on the ground without dry dock facilities. This was the first attempt to build FSO entirely on the ground and to launch it using two submersible barges. Successful load-out and float-off of 340,000 DWT Class Very Large Crude Carrier (VLCC) size AMENAM KPONO/FSO were carried out at the end of July 2002. The main feature of this successful operation includes the heavy weight and long length compared to breadth and depth of the load-out structure. It was 298 m long and weighs about 53,000 tons. So, special consideration was required to ensure safe load-out, towing and float-off operations compared with previous load-out of other offshore structures in which case the weight was less than 30,000 Mtons. The strength and longitudinal deflection of FSO were carefully designed/analyzed using Hydraulic Jacking System. Various systems and methodology for load-out including FSO fabrication and erection method on the ground, soil strength and stability quay wall located in offshore yard, operation of two multipurpose semi-submersible barges were all combined to develop a successful ‘Ground build method’.
The load-out operation was carried out using two semi-submersible barges connected together by rigid frame structures. The ballasting operation of double barge unit (DBU) can be controlled like a single barge using a load master control software (LMC). Throughout the operation, relative deflection in the form of DBU connection frames was monitored and DBU motion were analyzed and compared to our model test result. After 4 years of dedicated research, we were finally succeeded in confirming the technology of Ground Build design of floating structure, construction, load-out and float-off.