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Multi-zone control system coupled object security Safety Integrity Level Assessment

Author: ZhangNing
Tutor: ZhaoYongRui
School: China University of Petroleum
Course: Safety Technology and Engineering
Keywords: Safety-related systems Safety Integrity Level Failure Rate Markov model Average probability of dangerous failure
CLC: X924.4
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


With the improvement of electrical and electronic equipment reliability, many areas began to use the electrical, electronic devices consisting of control or safety systems to perform safety functions. These systems are used to reduce the risk or probability of occurrence of an event, or to mitigate the consequences of hazardous events in order to ultimately achieve the required security objectives. But because these safety-related system itself fails, resulting in the need to perform its safety function when the operation should not be performed correctly, leading to disaster. To ensure the E / E / PE safety-related system functions have been really performed research into the safety-related functions. This topic coupled objects for multi-zone temperature control system reliability studies, indicating that the major functional safety assessment methods and techniques to achieve desired effect. By PCC temperature control system hardware configuration, hardware data technical manuals, analyzing temperature control system works to identify the function of the temperature control loop chain security, the use of qualitative analysis and LOPA HAZOP analysis methods to determine the system temperature gauge / low security features performance metrics. FMEDA analysis techniques using hardware, combined with typical industrial database failure mode and effect analysis and dangerous consequence analysis were obtained for each failure mode of each component failure rate, also includes a detailed analysis of diagnostic capabilities. Topic difficulty is based on Markov reliability modeling, adding structural redundancy, common cause failure, diagnostic coverage and other factors that affect the reliability of the hardware, the establishment of three subsystems Markov model, the Markov modeling process more scientific and reasonable. Given the specific theoretical derivation process and programming in MATLAB to achieve large matrices fast computing. Is easily achieved based on Markov model, so camphor models and other methods of reliability block diagram reliability of safety instrumented systems analysis, Matlab7.6 development environment designed hardware evaluation software safety integrity. This software can be effectively achieved 1oo1, 1oo2, 2oo2, 2oo3, 1oo2D voting structures such as safety instrumented system reliability analysis and the average probability of dangerous failure PFD avg , security failure probability calculation of PFS and SIL, etc. . SIS can be used in the design and evaluation phase, with a friendly interface, modeling flexibility, easy operation and so on. The software's effectiveness and good precision for the subsequent design of safety instrumented system modeling some reference.

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CLC: > Environmental science, safety science > Safety Science > Safety management (labor protection and management ) > Safety Supervision > Safety control technology
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