Optimization of recertification intervals for PSV based on major accident risk |
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| Institution: | 1. Department of Production and Quality Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway;2. Department of Marine Technology, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway;1. Center for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao, 266580, PR China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 257061, PR China;3. Department of Environment and Safety Engineering, China University of Petroleum, Qingdao, 266580, PR China;1. Grupo de Diseño de Productos y Procesos (GDPP), Department of Chemical Engineering, Universidad de los Andes, Bogotá, Colombia;2. School of Management, Universidad de los Andes, Bogotá, Colombia;3. Centro para la Optimización y Probabilidad Aplicada (COPA), Department of Industrial Engineering, Universidad de los Andes, Bogotá, Colombia;1. School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, China;3. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;1. Department of Mechanical Engineering, Indian Institute of Technology Patna, Bihta, Bihar, 801103, India;2. Division 2.2, Reactive Substances and Systems, Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205, Berlin, Germany;3. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India;1. London South Bank University Explosion & Fire Research Group, 103 Borough Rd, SE1 0AA, UK;2. Honeywell Aerospace, Bunford Ln, Yeovil, BA20, UK |
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| Abstract: | Overpressure is a major hazard in the process industry with the potential to lead to a major accident. Pressure Safety Valves (PSVs) are often used as the last layer of protection against such a hazard and require regular recertification in order to be dependable. The valve safely vents gas from a vessel when the pressure becomes excessive. It is often the practice in industry to apply one or two years as the normal recertification interval of PSV. However, experience from the Norwegian oil and gas industry is that the recertification process several times have caused leaks of gas. The process thus represents a certain risk in itself and the question is then whether the recertification intervals presently being used actually are optimal from a risk point of view? The objective of this paper is to look into this problem, applying typical data from an oil and gas installation. An optimal recertification interval will be calculated based on minimization of risk to personnel. |
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| Keywords: | PSV Maintenance Optimization Process safety Major accident Risk |
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