Aulia, Muhammad Daffa and Sutarsis, Sutarsis and Jatimurti, Wikan (2025) Kajian Dan Peningkatan Akurasi Penilaian Risiko Dengan Integrasi Best Worst Method Dalam Risk-Based Inspection Semi-Kuantitatif Pada Sistem Fuel Gas. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Integritas aset merupakan aspek krusial dalam industri minyak dan gas untuk menjaga operasi yang aman dan efisien. Salah satu metode efektif dalam pengelolaan risiko adalah Risk-Based Inspection (RBI) yang memprioritaskan inspeksi pada peralatan berisiko tinggi. Namun, pendekatan konvensional berbasis standar API 581 masih mengandalkan judgement subjektif tanpa dukungan framework yang konsisten. Oleh karena itu, penelitian ini mengintegrasikan metode Best-Worst Method (BWM) sebagai pendekatan framework untuk meningkatkan objektivitas dan akurasi penilaian risiko. Studi dilakukan pada sistem fuel gas yang terdiri dari empat peralatan utama. Sistem ini dipilih karena peran vitalnya dalam banyak proses serta terhubung langsung dengan peralatan strategis seperti Gas Turbine Compressor (GTC). Mekanisme kerusakan dominan yang teridentifikasi adalah thinning akibat korosi 〖CO〗_2 serta corrosion under insulation (CUI) akibat akumulasi kelembaban di balik insulasi. BWM digunakan untuk menghasilkan bobot terhadap enam kriteria Probability of Failure (PoF) dan dua kriteria Consequence of Failure (CoF). Hasilnya menunjukkan bahwa inspection factor dan damage factor merupakan faktor dominan dalam PoF. Sedangkan dalam aspek CoF, dampak finansial dinilai lebih dominan dibandingkan dengan penyebaran area kerusakan. Evaluasi PoF dilakukan menggunakan tiga pendekatan yaitu kualitatif, kuantitatif, dan semi-kuantitatif berbasis BWM. Hasil menunjukkan bahwa ketiga peralatan yaitu HP Scrubber dan HP Separator A dan B. memiliki skor PoF sebesar 2 pada pendekatan kualitatif dan kuantitatif, sedangkan LP Separator bernilai 2 untuk kualitatif dan 1 untuk kuantitatif. Selanjutnya, nilai PoF semi-kuantitatif sebesar 2,267 untuk HP Scrubber, 2,231 dan 2,245 untuk HP Separator A dan B, serta 2,152 untuk LP Scrubber. Dalam aspek CoF, pendekatan semi-kuantitatif menunjukkan skor konsekuensi finansial sebesar 2,7166 untuk peralatan tekanan tinggi dan 1,8583 untuk LP Scrubber. Evaluasi risiko menunjukkan bahwa seluruh peralatan berada dalam kategori low hingga low-medium. Jadwal inspeksi internal disusun menggunakan pendekatan load leveling pada tahun 2029 untuk meningkatkan efisiensi shutdown dan konsistensi anggaran. Selain itu, metode inspeksi untuk thinning dan CUI ditingkatkan ke level fairly effective guna memastikan deteksi kerusakan yang lebih optimal. Integrasi BWM dalam RBI terbukti meningkatkan kualitas pengambilan keputusan teknis serta mendukung perencanaan inspeksi berbasis risiko secara lebih adaptif dan proporsional terhadap kondisi aktual sistem.
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Asset integrity is a crucial aspect in the oil and gas industry to ensure safe and efficient operations. One effective method in risk management is Risk-Based Inspection (RBI), which prioritizes inspections on equipment with the highest risk levels. However, conventional approaches based on API 581 standards often rely on subjective judgment without a consistent supporting framework. Therefore, this study integrates the Best-Worst Method (BWM) as a decision-making framework to enhance the objectivity and accuracy of risk assessments. The study was conducted on a fuel gas system consisting of four main equipment units. This system was selected due to its vital role in supporting turbines and other processing operations, as well as its direct connection to strategic equipment such as the Gas Turbine Compressor (GTC). The dominant failure mechanisms identified include thinning due to CO₂ corrosion and corrosion under insulation (CUI) caused by moisture accumulation beneath the insulation layer. BWM was used to assign weights to six Probability of Failure (PoF) criteria and two Consequence of Failure (CoF) criteria. The results indicate that inspection factor and damage factor are the most influential in PoF assessment, while financial consequence is considered more dominant in the CoF aspect compared to affected area. PoF evaluation was performed using three approaches: qualitative, quantitative, and semi-quantitative based on BWM. The results show that the HP Scrubber and HP Separators A and B scored 2 in both qualitative and quantitative assessments, while the LP Scrubber scored 2 and 1 respectively. In the semi-quantitative approach, PoF values were 2.267 for HP Scrubber, 2.231 and 2.245 for HP Separators A and B, and 2.152 for LP Scrubber. For CoF, the semi-quantitative results show a financial consequence score of 2.7166 for high-pressure equipment and 1.8583 for the LP Fuel Gas Scrubber. Risk evaluation indicates that all equipment falls within the low to low-medium risk categories. Internal inspection schedules were developed using a load leveling approach in 2029 to improve shutdown efficiency and budget consistency. In addition, inspection methods for thinning and CUI were upgraded to the fairly effective level to ensure more optimal damage detection. The integration of BWM into RBI proves to improve the quality of technical decision-making and supports a more adaptive and proportional risk-based inspection planning aligned with the actual conditions of the system.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Risk-Based Inspection , Best Worst Method, Corrosion under insulation, Sistem Fuel Gas |
| Subjects: | T Technology > T Technology (General) > T174.5 Technology--Risk assessment. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Daffa Aulia |
| Date Deposited: | 29 Jul 2025 03:29 |
| Last Modified: | 29 Jul 2025 03:29 |
| URI: | http://repository.its.ac.id/id/eprint/122569 |
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