HAZOP (Hazard and Operability study) 5. Penentuan Risk Ranking Berdasarkan MIL-STD-882D Category Significance Description High Component determining actions Acquisition Executive necessary, incidents, or Medium Program executive malfunctions; and requesting High officer waivers for safety requirements and program deviations Medium Program Manager Use PPE and SOP Low As directed Description Category Significance Catastrophic I Could result in death, permanen total disability Could result in permanent partial Critical II disability, injuries or occopational illness that may result in hospitalization of at least three personal Marginal III Could result in injury or occupation illness resulting in one or more lost work days. Negligible IV Could result in injury or illness not resulting in a lost work day Description Level Probability Frequent A <10-1 Probable B 10-1 s/d 10-2 Occasional C 10-2 s/d 10-3 Remote D 10-3 s/d 10-6 Improbable E > 10-6
HAZOP (Hazard and Operability study) Node Deviasi Cause A B C : Truck LPG Liquid Loading : High Pressure : Valve on vapor return line not opened SDV 2X02,HV 2X08, dan HV 2X09 Q = A B C P( Q) = P( A B C) = P(A) + P(B) + P(C) P(A B) P(A C) P(B C) + P(A B C) = 0.0012 Sehingga Frekuensi terjadinya deviasi sebesar 0.0012 masuk dalam kategori C
HAZOP (Hazard and Operability study) Node Deviasi Consequence Dimodelkan dengan simulasi Shellfred : Truck LPG Liquid Loading : High Pressure : Over pressure on pipe, skid tank, and leaked on TLA (Truck Loading arm) Hole Size Injury Massflow Rate (kg/s) 0.25 Inch no Skin demage 0.66 1 Inch First degree burn 10.61 Rupture Second degree burn 57.07 Diambil skenario hole size 1 inch sehingga operator yang mengalami luka bakar akan berjumlah lebih dari 3 orang sehingga masuk dalam kategori II. Sehingga frekuensi dengan kategori C dan consekuensi kategori II menunjukkan level resiko Medium Risk. Hole Size 0.1 inch
Bow Tie Diagram Bow Tie diagram merupakan suatu visualisasi Process Hazard dan Kesuluruhan kemungkinan proses dapat diketahui dengan pendekatan boolean. Konsekuensi dari HAZOP Couse dari HAZOP Safeguard dari HAZOP
(SIL) merupakan suatu pengelompokan peforma suatu peralatan yang menjalankan Safety Instrument function (SIF). Parameter SIL : Availability dan PFD(probability failure on demand) Hyatt Nigel, Guidelines for Process Hazard analysis, hazard Identification & Risk Analysis page 20-3
Analisa Data Resume Hazop 1 4 1 1 16 19
Analisa Data Hasil Screening Hazop Node deviasi Cause Consequence Safeguard 1 High level Human error when operation,there are still previous product left on the truck over pressure on skid tank, leak on TLA PSV on skid tank 1 High Pressure valve at vapour return line isn't opened over pressure on skid tank, leaked on TLA PSV on skid tank and.pressure alarm 2 No Flow SDV-1X05, SDV-2X02, HV- 2X06, and HV-2X09 is closed over pressure on pipe, leaked on TLA over pressure on skid tank PSV on skid tank PSV on skid tank 2 Low Flow SDV-1X05, SDV-2X02, HV- 2X06, and HV-2X09 not imperfect valve opened over pressure on skid tank, leaked on TLA PSV on skid tank
Analisa Data Scenario No release No Flame Jet Fire PFD 3.69E-02 9.46E-03 2.43E-04 * No release is condition where no LPG release on enviroment when overpressure occur * No flame is condition where LPG release on enviroment and not ignition (safe dispertion) * Jet Fire is condition where LPG release on enviroment and ignition.
Kesimpulan Safety Add your Integrity company Level slogan Berdasarkan analisa HAZOP terdapat Risk ranking ketegori Medium High Risk 4 titik dan high risk 1 satu titik, keempat titik tersebut terdapat pada daerah filling shed. Jika sistem mengalami over pressure, kemungkinan 3 skenario kejadian yang mungkin akan terjadi meliputi no release dengan probability 3.69E-02, no-flame dengan probability 9.46E-03, dan Jet-fire dengan probability 2.43E-04. Skenario berpeluang terjadinya jet fire sebesar 2.43E-04. Nilai 2.43E-04 masuk dalam kriteria SIL 3. Peforma layer protection yang terdapat di filling shed sesuai dengan yang di gunakan pada terminal LPG Zhuhai, Guandong, China yaitu SIL 3.
Review Safety Add your Integrity company Level slogan Terminal LPG bergerak di bidang jasa penerimaan, pencampuran, penimbunan, dan enyaluran LPG. Kesalahan Operasi pada sebuah Terminal LPG akan berdampak pada operasional dan operator. Untuk mengatasi kesalahan Operasi, Terminal LPG Zhuhai, Guandong,China menerapkan SIL-3. Dari hasil analisa peforma layer protection yang terdapat di filling shed Terminal LPG masuk dalam kriteria SIL 3 dengan nilai PFD 2.43E-04.