OPTIMISASI METODE PENJADWALAN KAPAL PENGISIAN KEMBALI PERSEDIAAN LPG DI TERMINAL AKHIR MOR Y PT X DENGAN MENGGUNAKAN PEMROGRAMAN LINIER

• Main Author: Rahma Tsurayya, Raisa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81604
• Institution: Institut Teknologi Bandung

PT X is a state-owned enterprise (SOE) that holds the largest market share of liquefied petroleum gas (LPG) in Indonesia. PT X must comply the principle of availability in its energy distribution, ensuring stock availability. One performance measure of stock resilience is coverage days, which indicates the number of days LPG demand can be met with the available stock. Based on the actual LPG stock data of PT X in 2022, the coverage days value for the end terminal in MOR Y was 4.28 days. In 2022, there were 122 days when the coverage days value for LPG at end terminal MOR Y was less than 3 days (the standard coverage days set by the Ministry of Energy and Mineral Resources). The total cost of replenshiment LPG at MOR Y by PT X was also high, amounting to Rp267,891,555,860, contributing 22.769% of the total national LPG replenishment cost of PT X. The high costs and the low coverage days are due to unoptimal replenishment scheduling.Therefore, it is necessary to determine the LPG replenishment schedule for MOR Y of PT X to enhance stock resilience and reduce replenishment costs. A linear programming model was developed in this research to determine the volume of LPG delivered to the end terminal, the delivery time, supply point, and the ships used to deliver LPG to achieve the minimum LPG replenishment cost. The decisions generated are at the tactical level, with a supply planning over one year. To accommodate the uncertainty in ship availability, the model solution is carried out using the rolling horizon method, which seeks the optimal solution for each period. The optimal model solution results in a total LPG replenishment cost of Rp257,432,613,283. This value represents a decrease of 3.9% from the existing condition. The optimal model solution also results in a coverage days value of 4.82 days, an increase of 12.54% from the existing condition. The total volume of LPG delivered to the end terminal MOR Y is 1,688,989 MT. Four small II type ships with 33.29% utilization per year and five midsize ships with 63.23% utilization per year are required to achieve the minimum replenishment cost.