Electronic Theses and Dissertation

Mesin kompresor boil off gas (bog) k-6801 b di pt. perta arun gas merupakan aset kritis yang berfungsi mengompresi gas hasil penguapan dari tangki penyimpanan lng agar dapat dimanfaatkan kembali dalam proses operasional. tingginya downtime mesin selama periode 2020–2025 yang mencapai 12.100 jam menyebabkan penurunan tingkat keandalan dan ketersediaan operasi sehingga diperlukan strategi perawatan yang lebih tepat. penelitian ini bertujuan untuk mengidentifikasi jenis kegagalan yang paling kritis, menganalisis tingkat keandalan, serta menentukan interval perawatan menggunakan metode reliability centered maintenance (rcm). tahapan penelitian meliputi identifikasi sistem, penyusunan failure mode effect and criticality analysis (fmeca), logic tree analysis (lta), task selection, analisis keandalan, dan penentuan interval perawatan. hasil penelitian menunjukkan bahwa berdasarkan analisis fmeca diperoleh 4 sistem kritis yang memiliki tingkat risiko tertinggi yaitu hmi malfunction dan discrepancy indication pada sistem control and monitoring, sight glass dirty pada sistem lubrication, dan motor malfunction pada sistem electric motor yang berpengaruh terhadap gangguan operasi mesin kompresor bog k-6801 b. analisis keandalan menghasilkan nilai mean time between failure (mtbf) sebesar 6.920 jam, mean time to repair (mttr) sebesar 4.033,33 jam, dan availability sebesar 63,18%. berdasarkan hasil tersebut diperoleh rekomendasi interval preventive maintenance setiap 6.920 jam operasi atau sekitar 9 bulan 6 hari. penerapan rekomendasi perawatan diharapkan dapat mengurangi downtime serta meningkatkan keandalan dan ketersediaan mesin

The Boil-Off Gas (BOG) Compressor K-6801 B at PT Perta Arun Gas is a critical asset that compresses boil-off gas generated from LNG storage tanks, enabling it to be recovered and reused in the operational process. However, the compressor experienced a total downtime of 12,100 hours during the 2020–2025 period, resulting in decreased equipment reliability and operational availability. Therefore, an effective maintenance strategy is required to improve its performance. This study aims to identify the most critical failure modes, evaluate the reliability level of the compressor, and determine the optimal maintenance interval using the Reliability Centered Maintenance (RCM) approach. The research methodology consists of system identification, Failure Mode, Effects, and Criticality Analysis (FMECA), Logic Tree Analysis (LTA), task selection, reliability analysis, and maintenance interval determination. The FMECA results identified four critical failure modes with the highest risk levels, namely HMI Malfunction and Discrepancy Indication in the Control and Monitoring System, Sight Glass Dirty in the Lubrication System, and Motor Malfunction in the Electric Motor System, all of which significantly affect the operation performance of the BOG Compressor K-6801 B. The reliability analysis yielded a Mean Time Between Failure (MTBF) of 6.920 hours, a Mean Time To Repair (MTTR) of 4.033,33 hours, and an availability of 63,18%. Based on these results, the recommended preventive maintenance interval is 6.920 operating hours, equivalent to approximately 9 months and 6 days. The implementation of this maintenance schedule is expected to reduce compressor downtime while improving its reliability and operational availability.