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Research of Risk Assessment and Safety Instrumented Function Assessment Technologies in Petrochemical plant

Author: YuTao
Tutor: YangJianFeng
School: Beijing University of Chemical Technology
Course: Safety Technology and Engineering
Keywords: risk assessment Hazard and Operability study (HAZOP) Layer of Protection Analysis (LOPA) Quantitative Risk Assessment(QRA) Safety Instrumented Function (SIF) Safety Integrity Level (SIL)
CLC: X937
Type: Master's thesis
Year: 2012
Downloads: 150
Quote: 1
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Abstract


Risk assessment technology is considered as an effective measure ofidentifying the potential risk. As a quantitative risk assessment, Hazardand Operability study (HAZOP) has played an important role. But it isstill weak in analyzing whether the protection layers are enough. HAZOPand Layer of Protection Analysis (LOPA) are combined and asemi-quantitative risk assessment method is raised in this thesis, whichunites the advantages of both two methods perfectly. An engineeringproject is researched, which confirms that more effective risk assessmentcan be achieved by using HAZOP/LOPA. However, a semi-quantitativerisk assessment method can not define the risk of a complicatedequipment or process exactly. Quantitative Risk Assessment (QRA)technology can solve this problem well and which is recommended to bea supplement of HAZOP/LOPA. As a result, the “HAZOP/LOPA+QRA”methodology for risk assessment is established.Safety Instrumented System (SIS) is a device widely used in petrochemical plant to protect the system safety. Safety InstrumentedFunction executed by SIS is the last line of defense of preventing thefailure events. An audio-visual model based on IEC61508/61511isestablished in this thesis. The application of LOPA based SILdetermination technology is researched detailed. Meanwhile, SILvalidation technologies based on (Reliability Block Diagram) RBD, FTA(Fault Tree Analysis) and Markov Model are researched. The threemethods are compared by a project and the“LOPA+Markov”methodology for SIF assessment is established.

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CLC: > Environmental science, safety science > Safety Science > Safety Engineering > Petroleum, chemical industry security
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