Dropped Polyester Mooring Line Qualification for Reuse

Craig R Gage, P. Liagre, C. Heyl, C. D. Vecchio
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引用次数: 1

Abstract

The Perdido platform is a spar located in a water depth of 7,825 feet in the Alaminos Canyon Block 857in the Gulf of Mexico. The mooring system consists of nine mooring lines in three groups of three, spacedapproximately 120 degrees apart between each group. Each mooring line is composed of a platform chain,a multi-segment polyester rope including a 120 feet long test insert at the top, a ground chain, a pile chainand other associated connectors. The mooring lines are connected to suction piles. The Minimum BreakStrength for the Perdido polyester mooring line is 4,000 kips. Installation of the spar hull was completed inSeptember 2008 and the topsides was set in March 2009. The spar and its mooring system were originallydesigned for a twenty (20) year life. On May 4, 2019, mooring line # 6 (ML6) was contacted by a marine vessel down line and was severed.Contact occurred along the polyester test insert. A recovery effort was planned, and the mooring line wasreplaced in early June. The original ML6 was recovered from the seafloor on June 4, 2019 as a part of thatcampaign and submitted to an initial inspection. This paper is not intended to go into either the cause of the incident or the replacement of ML6 but willlook to the inspection of the recovered mooring line and explore its suitability for reuse. Initial inspection ofthe lines suggested minimal damage to the polyester rope segments and raised questions to the impacts of 10years of use. Testing was envisioned as a learning opportunity for the impact of service on polyester mooringand was reinforced by the potential cost savings that could be attained though reuse. A methodology wasdeveloped, supported by initial inspections and a suite of testing was performed. The results of these testsare presented in the following, along with a proposed process for assessing and considering reuse of a linefollowing a drop. Additionally, conclusions will be shared for the process, the results, and the potentialramifications for the industry.
聚酯系泊绳的再利用鉴定
Perdido平台位于墨西哥湾Alaminos峡谷857区块,水深7825英尺。系泊系统由九根系泊线组成,每组三根,每组之间间隔约120度。每条系泊线由一根平台链、一根多段聚酯绳(顶部有一根120英尺长的测试插入件)、一根地链、一根桩链和其他相关连接器组成。系泊绳与吸桩相连。Perdido聚酯系泊线的最小断裂强度为4,000 kips。spar船体的安装于2008年9月完成,上层甲板于2009年3月安装。船梁及其系泊系统最初的设计寿命为20年。2019年5月4日,6号系泊线(ML6)与一艘海上船只的下行线接触并被切断。沿聚酯测试插入件发生接触。计划进行恢复工作,并于6月初更换了系泊线。作为该行动的一部分,最初的ML6于2019年6月4日从海底打捞出来,并提交了初步检查。本文不打算探讨事故原因或ML6的更换,但将着眼于检查回收的系泊线并探讨其重新使用的适用性。对生产线的初步检查表明聚酯绳段的损坏最小,并提出了10年使用影响的问题。测试被设想为一个学习聚酯系泊服务影响的机会,并且通过重复使用可以获得潜在的成本节约。在初步检查和一系列测试的支持下,开发了一套方法。以下列出了这些测试的结果,并提出了评估和考虑在下降后重新使用一行的拟议流程。此外,还将分享有关过程、结果以及对行业的潜在影响的结论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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