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Abstrak: Boiler beroperasi pada temperatur dan tekanan tinggi sehingga memiliki risiko ledakan. Untuk itu boiler memiliki sistem kontrol untuk mengendalikan bahaya temperatur dan tekanan tinggi menggunakan Safety Instrumented Systems (SIS) . Tujuan penelitian ini untuk mengetahui Safety Integrity Level (SIL) yang menunjukan kinerja dari SIS pada boiler PT X. Penelitian ini dimulai dengan menganalisis risiko menggunakan metode hazard operability study (Hazops) untuk mendapatkan skor risiko. Hasil analisis metode Hazops menunjukkan skor risiko tertinggi pada unit boiler final superheater dan reheater sebesar 25, sedangkan skor risiko evaporator, low temperatur superheater, dan platen superheater sebesar 20. Skor tertinggi ini dikategorikan critical , sehingga risiko tidak dapat diterima dan pengendalian harus secepatnya dilakukan. Risiko terendah pada economizer dengan skor 10. Penentuan SIL menggunakan dua metode yaitu metode risk graph dan metode kuantitatif. Analisis dengan metode risk graph pada SIS unit boiler economizer menunjukkan kontrol dapat dilakukan secara manual. Sedangkan penentuan SIL pada evaporator dan low temperatur superheater menghasilkan SIL 1. Analisis risk graph pada unit boiler platen superheter, final superheater, dan reheater menghasilkan SIL 2 di semua SIS pada 3 unit ini. Penentuan SIL secara kuantitatif pada platen superheater dan final superheater menghasilkan SIL 1. Unit reheater menghasilkan SIL 2. Ini menunjukkan perlu adanya peningkatan dari SIL 1 menjadi SIL 2 pada platen superheater dan final superheater dengan mengubah desain safety instrumented function dan mengurangi waktu kalibrasi dari 1 tahun menjadi 6 bulan. Kata kunci: boiler, hazops, sil, risk graph, quantitative method Abstrac t: Boiler operated at high temperatures and pressures so it has a risk of explosion. Therefore, the boiler has an automatic control system to minimize the hazard of high temperatures and pressures using Safety Instrumented Systems (SIS). The purpose of this research is to determine Safety Integrity Level (SIL) which is the performance of SIS. This research begins to analyze risk using the hazard operability study method (Hazops) to get a risk score. The results of the Hazops method analysis showed the highest risk score on the final superheater and reheater boiler units of 25, while the evaporator score, the superheater low temperature, and the superheater platen were 20 categorized as critical so control must be done as soon as possible. The lowest risk on economists with a score of 10. SIL determination uses two methods are the risk graph method and the quantitative method. Analysis uses the risk graph method on the SIS boiler economizer unit shows that control can be done manually. While SIL on evaporator and low temperature superheater results SIL 1. Risk graph analysis on the superheter platen boiler unit, final superheater, and reheater produces SIL 2 in all SIS in these 3 units. Quantitative determination of SIL on the platen superheater and final superheater shows SIL 1. The reheater unit shows SIL 2. The results of the analysis indicate that there is an increase from SIL 1 to SIL 2 on the platen superheater and final superheater by changing the safety instrumented function design and reducing calibration time from 1 year to 6 months. Keywords : boiler, hazops, sil, risk graph, quantitative method

jurnal teknik lingkungan

ANALISIS RISIKO DENGAN METODE HAZARD AND OPERABILITY STUDY (HAZOPS) DALAM PENENTUAN SAFETY INTEGRITY LEVEL (SIL) BERBASIS RISK GRAPH DAN QUANTITATIVE METHOD PADA UNIT BOILER PT X