Saija, Sindu Prayatayodha (2026) Analisis Risiko Piping Rock Muffler Akibat Perbedaan Konfigurasi Scrubber Pada Geothermal Power Plant Menggunakan Pendekatan Risk Based Inspection. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Integritas sistem perpipaan merupakan faktor fundamental dalam menjamin keandalan operasional Pembangkit Listrik Tenaga Panas Bumi (PLTP). Penelitian ini mengevaluasi risiko akibat perbedaan desain konfigurasi pada jalur pipa menuju rock muffler di Pembangkit Listrik Tenaga Panas Bumi (PLTP) Unit 4 dan Unit 5. Pada Unit 4, jalur pipa ditempatkan setelah proses pemurnian (after-scrubber), sedangkan pada Unit 5 ditempatkan sebelum proses pemurnian (before-scrubber). Penelitian ini telah melakukan analisis risiko komparatif secara kuantitatif menggunakan metode Risk-Based Inspection (RBI) yang mengacu pada standar ASME PCC-3, dengan mengevaluasi kondisi operasi normal dan kondisi kedaruratan (trip). Hasil analisis menunjukkan bahwa pada kondisi normal, kedua unit sama-sama memiliki tingkat risiko Medium-High (4C), namun dengan profil ancaman yang berbeda. Unit 4 murni terancam oleh korosi internal (Sour Water Corrosion), sedangkan Unit 5 menghadapi ancaman ganda (double-threat) dari korosi internal dan eksternal (Corrosion Under Insulation/CUI) akibat perbedaan temperatur operasi. Pada kondisi trip, profil risiko kedua unit melonjak tajam menjadi High Risk (5C) akibat peningkatan kecepatan aliran fluida secara ekstrem yang memicu mekanisme erosion-corrosion yang sangat destruktif. Berdasarkan temuan tersebut, rekomendasi perencanaan inspeksi rutin ditetapkan dengan interval 48 bulan, di mana Unit 5 memerlukan penambahan metode Pulsed Eddy Current (PEC) untuk mendeteksi CUI. Namun, apabila terjadi insiden trip, jadwal rutin tersebut dibatalkan dan wajib segera dilaksanakan Event-Driven Inspection (inspeksi pasca-kejadian) yang difokuskan pada pemantauan penipisan ketebalan dinding di area lengkungan pipa (elbows).
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Piping system integrity is a fundamental factor in ensuring the operational reliability of Geothermal Power Plants. This study evaluates the risks associated with design configuration differences in the piping lines leading to the rock muffler at Geothermal Power Plant Unit 4 and Unit 5. In Unit 4, the piping is positioned downstream of the purification process (after-scrubber), whereas in Unit 5, it is positioned upstream (before-scrubber). This research has conducted a quantitative comparative risk analysis using the Risk-Based Inspection (RBI) methodology in accordance with the ASME PCC-3 standard, evaluating both normal operating and emergency (trip) conditions. The analysis results reveal that under normal conditions, both units exhibit a Medium-High risk level (4C), but with distinct threat profiles. Unit 4 is solely threatened by internal corrosion (Sour Water Corrosion), while Unit 5 faces a double-threat from both internal corrosion and external Corrosion Under Insulation (CUI) due to differences in operating temperatures. Under trip conditions, the risk profiles of both units escalate sharply to High Risk (5C) driven by extreme surges in fluid flow velocity that trigger highly destructive erosion-corrosion mechanisms. Based on these findings, a routine inspection plan is recommended at a 48-month interval, with Unit 5 requiring the addition of the Pulsed Eddy Current (PEC) method to detect CUI. However, in the event of a trip incident, the routine schedule is overridden by a mandatory, immediate Event-Driven Inspection focusing on monitoring wall thickness thinning at pipe elbows.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Geothermal Power Plant, Konfigurasi Scrubber, Risk-Based Inspection (RBI), Rock Muffler, ASME PCC-3, Scrubber Configuration |
| Subjects: | T Technology > T Technology (General) > T174.5 Technology--Risk assessment. T Technology > T Technology (General) > T55.3.H3 Hazardous substances--Safety measures. T Technology > T Technology (General) > T55 Industrial Safety T Technology > TH Building construction > TH6840 Piping installation. Pipefitting T Technology > TP Chemical technology > TP159.S4 Separators (Machine) |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | Sindu Prayatayodha Saija |
| Date Deposited: | 03 Aug 2026 10:21 |
| Last Modified: | 03 Aug 2026 10:21 |
| URI: | http://repository.its.ac.id/id/eprint/142384 |
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