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Abstract As a classification society, BKI is responsible for ensuring that SPM meet safety and quality according to classification standards. Many SPMs in Indonesia are aged, lack data, and uncertified, posing challenges in identification, verification, and justification during classification process, especially in relation to determining the potential of failure. Overloading is one of the main causes of SPM failure. However, current assessments often neglect the impact of offloading arrangements, such as stand-alone, side-by-side, and tandem configurations that may contribute to the system overloading. This study investigates how these variations affect structural integrity and safety of SPM. The study adopts a technical approach grounded in BKI Rules and guidelines, PTK-015/SKKMA0000/2022/S9, and API-RP2SK. Dynamic time-domain analysis is carried out to simulate vessel and Single Point Mooring (SPM) motions, as well as mooring line tension responses under various environmental and offloading conditions load. Fatigue life of mooring chains is further evaluated using Palmgren-Miner's rule in conjunction with Rainflow cycle counting method. The scope includes variations in offloading vessel deadweight (DWT), mooring configuration, and offloading arrangement, with the goal of capturing differences in structural response and degradation patterns. The research found that the offloading arrangement influence the mooring tension result, especially for the fatigue damage calculation. The stand-alone condition, side-by-side condition, and tandem condition may have different motions responses that cause a different tension result compared each other, under similar environmental conditions. These dynamic differences are effect on the tension range and counting that make the fatigue damage of mooring chain is different each other. This study confirms that generalized load capacity (when conducted without considering specific offloading arrangement) lead to inappropriate or disputed outcomes. By incorporating the offloading arrangement analysis, this research aims to enhance the accuracy and credibility of structural assessments for existing SPM systems. It is recommended that both the maximum load capacity and the associated offloading arrangement be explicitly stated in the SPM classification certificate. This paper presents a methodology that integrates offloading arrangement analysis into SPM system safety evaluations through a structure and hydrodynamic approach. This study proposed method refines existing classification practices by reducing uncertainty, especially for aged SPM systems with limited data. Offering new insights for classification societies and offshore operators, particularly in data-deficient regions. The outcomes aim to enhance the accuracy and credibility of classification deliverables while supporting safer and more sustainable offshore operations.