The Study of Mooring Buoy Operability to Support Offloading Operation of Shuttle Tankers with Various Capacities

M. Fajar, E. Djatmiko, Murdjito
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Abstract

This study was conducted to analyse of the operability of mooring buoy initially designed for offloading operation of 35,000 DWT shuttle tankers enhanced to serve the offloading operations of shuttle tankers with 50,000 DWT, 75,000 DWT, and 111,000 DWT capacities. Operability is reviewed in term of mooring line tensions induced by each new variation of tanker capacity under environmental conditions of 1-year, 10-year, and 100-year recurrence. The governing criteria is that the safety factor should meet the appropriate limit as stated in the API RP2SK. Tension on the mooring line increases in parallel with the increasing of tanker capacity. For the case of 35,000 DWT and 50,000 DWT shuttle tankers the operation can be performed in all environmental conditions. For the case of 75,000 DWT shuttle tanker with full load and 67% DWT capacity can fully operate in all environmental conditions, but with 47% DWT capacity could not be operated in the 100-year environmental condition with significant wave height 3.31 m for the direction of inline-L1, inline-L2, and between line-L1&L4. For the case of 111,000 DWT shuttle tanker at all capacity conditions can fully operate in the 1-year environmental condition with significant wave height up to 1.48 m.
支持不同容量穿梭油轮卸载作业的系泊浮筒可操作性研究
本研究旨在分析系泊浮筒的可操作性,该浮筒最初设计用于3.5万载重吨穿梭油轮的卸载作业,经过改进后可用于5万载重吨、7.5万载重吨和11.1万载重吨穿梭油轮的卸载作业。在1年、10年和100年反复出现的环境条件下,根据油轮容量每次新变化引起的系泊索张力,对可操作性进行了评估。控制标准是安全系数应满足API RP2SK中规定的适当限制。随着油轮容量的增大,系泊索张力呈平行增加趋势。对于35000载重吨和50000载重吨穿梭油轮,该操作可以在所有环境条件下进行。以75000载重吨梭子船为例,满载67%载重吨的梭子船在所有环境条件下均可满负荷运行,而47%载重吨的梭子船在直航l1、直航l2、直航l1与l4之间显著波高3.31 m的100年环境条件下不能正常运行。以111,000载重吨穿梭油轮为例,在所有容量条件下,可以在有效波高高达1.48 m的1年环境条件下完全运行。
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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