Novel Anchoring Solutions for FLNG - Opportunities Driven by Scale
Novel Anchoring Solutions for FLNG - Opportunities Driven by Scale
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FLNG 的新型锚定解决方案 - 规模驱动的机遇
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. Stanier
中科院分区：
文献类型：
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作者：
C. O’Loughlin;D. White;S. Stanier
版权所有©（2015）由海上技术会议保留所有权利。FLNG设施提出了比现有浮式结构更繁重的锚固要求。通过改进的设计或通过新颖的锚类型优化锚固技术提供了潜在的成本和风险效益。这些好处也适用于MODU和FPSO的小型系泊系统。本文使用锚能力的概念级设计计算，比较FLNG和MODU/FPSO应用背景下的不同锚技术。此外，链-土壤相互作用的物理模拟的新的意见。通过采用吸力或动态安装的替代板锚技术，确定了显著节省成本和进度的机会。仅考虑制造，相对于传统的吸力沉箱方案，FLNG的估计成本降低了70%，MODU的估计成本降低了80%。当考虑安装船成本时，绝对成本节约可能远远高于单独制造，因为安装可以通过锚处理船进行，而不是通过带有重型起重起重机的施工驳船进行。鱼雷锚也被考虑过，但吸引力较小。嵌入式锚链的形状和能力的模型数据和计算表明，海床上和海床内的系泊链的能力可能被忽略。同时，将嵌入式板放大到FLNG应用所需的规模，会增加在使用载荷期间释放到系泊系统中的链条松弛量，这种影响需要在整个系泊系统设计中加以考虑。研究和开发活动与锚定设计中降低成本和风险的机会相一致。
Copyright © (2015) by the Offshore Technology Conference All rights reserved. FLNG facilities present a more onerous anchoring requirement than existing floating structures. Optimisation of the anchoring technology through improved design or through novel anchor types offers potential cost and risk benefits. These benefits may also be applicable to smaller moorings for MODUs and FPSOs. This paper uses concept-level design calculations of anchor capacity to compare different anchor technologies in the context of FLNG and MODU/FPSO applications. Also, new observations from physical modelling of chain-soil interaction are presented. Opportunities are identified for significant cost and schedule savings by adopting the alternative plate anchor technologies that are either suction or dynamically installed. Considering fabrication alone, the estimated costs are reduced by 70% for FLNG and 80% for MODUs relative to the conventional suction caisson option. When installation vessel costs are considered, the absolute cost saving could be far higher than from fabrication alone because installation could be from an anchor-handling vessel rather than a construction barge with a heavy lift crane. Torpedo anchors have also been considered, but are less attractive. Centrifuge model data and calculations of the shape and capacity of the embedded anchor chain suggest that there may be over-looked capacity from the mooring chain both on and within the seabed. At the same time, upscaling of embedded plates to the scale required for FLNG applications increases the amount of chain slack that would be released into the mooring during in service loading, and this effect requires consideration in the overall mooring system design. Research and development activities aligned with the opportunities for reduced cost and risk in anchoring design are set out.