<![CDATA[This study focuses on the pre-design of a recycling system for the remaining Liquefied Petroleum Gas (LPG) in the inboard arm of V-6410 to optimize resource utilization and reduce environmental impact. Currently, remaining LPG during the loading process is disposed of via flaring or blowdown to the sea, leading to resource loss and potential environmental harm. The research identified a remaining LPG volume of 0.896 MT. To recycle this LPG to D-6456, a 177.9 m pipeline with a 2-inch NPS diameter is required, achieving a flow velocity of 3.266 m/s and a flow rate of 100.8 m³/h. The system exhibits turbulent flow with a Reynolds number of 9 × 10⁵ and a total friction loss of 85.21 m. Mass and energy balance calculations confirmed equilibrium, with incoming and outgoing mass flow rates of 123,924.047 kg/h and energy rates of 766,778.213 kJ/h. Economic feasibility analysis shows the project requires an investment of IDR 360,769,947.4, generating annual revenue of IDR 1,797,440,881. The Payback Period (PBP) is 2.1 months, with a positive Net Present Value (NPV) of IDR 362,761,862 and an Internal Rate of Return (IRR) of 17%, proving economic viability. The proposed design offers a sustainable solution by reducing waste, minimizing environmental impact, and increasing profitability. This study provides a practical framework for implementing resource optimization strategies in industrial LPG handling systems.]]>
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