Dewantoro, Alan Darmawan (2026) Laporan Magang Perangkingan Risiko Instrumen pada Sistem Proteksi Trip Steam Turbine Berdasarkan Analisis HAZOP, FTA, dan SIL Sebagai Acuan Penentuan Prioritas Interlock Protection Test. Project Report. [s.n.]. (Unpublished)
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Abstract
Steam Turbine pada PLTGU Priok Blok 4 beroperasi dengan sistem proteksi otomatis yang akan mengaktifkan kondisi trip apabila salah satu parameter proses melampaui batas operasionalnya. Delapan instrumen yang tergabung dalam logika emergency trip meliputi ST Bearing Oil Pressure, Condenser Vacuum Pressure, LP Turbine Exhaust Steam Temperature, ST Emergency Trip Oil Pressure, HRSG HP/IP/LP Drum Level, dan ST Bearing Rotor Vibration. Pengujian keandalan instrumen tersebut dilaksanakan melalui loop test pada agenda overhaul, namun penjadwalannya selama ini masih didasarkan pada pertimbangan subjektif teknisi tanpa acuan standar yang terukur. Penelitian ini bertujuan menyusun prioritas penjadwalan loop test instrumen sistem proteksi emergency trip Steam Turbine berbasis analisis risiko. Pendekatan yang digunakan adalah analisis HAZOP secara kualitatif dan perhitungan Safety Integrity Level (SIL) melalui nilai Probability of Failure on Demand (PFD) secara kuantitatif berdasarkan standar IEC 61882, ISA-TR84.00.02, dan IEC 61508. Hasil analisis HAZOP menunjukkan 37,5% instrumen berada pada kategori risiko High, 37,5% pada kategori Medium dan 25% kategori low. Perhitungan PFD dilakukan berdasarkan dua konfigurasi voting logic: konfigurasi 2oo2 untuk sensor vibration menghasilkan PFD sebesar 0.18703 (SIL 1), sedangkan konfigurasi 2oo3 untuk tujuh instrumen lainnya menghasilkan PFD sebesar 0.03498 (SIL 2). Integrasi hasil kedua metode tersebut menjadi dasar perangkingan risiko dan penyusunan jadwal prioritas loop test yang objektif dan terstandar.
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The steam turbine at the Priok Combined Cycle Power Plant, Block 4, operates with an automatic protection system that triggers a trip if any of the process parameters exceed their operational limits. The eight instruments included in the emergency trip logic are ST Bearing Oil Pressure, Condenser Vacuum Pressure, LP Turbine Exhaust Steam Temperature, ST Emergency Trip Oil Pressure, HRSG HP/IP/LP Drum Level, and ST Bearing Rotor Vibration. Reliability testing of these instruments is conducted via loop tests during scheduled overhauls; however, the scheduling has thus far been based on technicians’ subjective judgments without reference to measurable standards. This study aims to establish priority scheduling for loop tests of the Steam Turbine emergency trip protection system instruments based on risk analysis. The approaches used were a qualitative HAZOP analysis and a quantitative calculation of the Safety Integrity Level (SIL) using the Probability of Failure on Demand (PFD) value, based on the standards IEC 61882, ISA-TR84.00.02, and IEC 61508. The results of the HAZOP analysis showed that 37.5% of the instruments fell into the High-risk category, 37.5% into the Medium-risk category, and 25% into the Low-risk category. The PFD calculation is based on two voting logic configurations: the 2oo2 configuration for the vibration sensor yields a PFD of 0.18703 (SIL 1), while the 2oo3 configuration for the other seven instruments yields a PFD of 0.03498 (SIL 2). The integration of the results from these two methods serves as the basis for risk ranking and the development of an objective and standardized loop test priority schedule.
| Item Type: | Monograph (Project Report) |
|---|---|
| Uncontrolled Keywords: | Emergency Trip, Steam Turbine, HAZOP, Safety Integrity Level (SIL), Loop Test |
| Subjects: | Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QC Physics > QC271.8.C3 Calibration T Technology > TA Engineering (General). Civil engineering (General) > TA169 Reliability (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1001 Production of electric energy or power T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1322.6 Electric power-plants |
| Divisions: | Faculty of Vocational > Instrumentation Engineering |
| Depositing User: | Alan Darmawan Dewantoro |
| Date Deposited: | 27 Jul 2026 03:45 |
| Last Modified: | 27 Jul 2026 03:45 |
| URI: | http://repository.its.ac.id/id/eprint/137496 |
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