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An FPSO that attached to an SPM with several mooring lines has a collision risk due to the environmental loads. This paper presents analysis of station-keeping FPSO and SPM to prevent colision using an AHTS. The principal dimension of the FPSO is 180m in length, 33m in breadth, 18m height and 12m draft. while the environmental loads is 6m wave height, wind speed around 30knots, current 1 m/s. The analysis shows that the FPSO requires 122 ton bollard pull AHTS for full load and 147 ton for ballast load. The bollard pull can be divided into two vessels in order to make a safe operation which means 74 ton for each AHTS which can be divided into two vessels in order to make a safe operation.

Station-keeping analysis of an FPSO to prevent collision with SPM using AHTS