Strength and tightness evaluation method for pipe flange connections considering thermal effects |
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| Institution: | 1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, 300350, China;2. CNOOC Energy Development Equipment Technology Co., Ltd., Tianjin, 300072, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, China;2. School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907-2088, USA;3. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;1. ETSI Minas y Energía, Universidad Politécnica de Madrid, Madrid, Spain;2. Laboratorio Oficial JM de Madariaga, Universidad Politécnica de Madrid, Getafe, Spain;1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China;3. Fire and Explosion Prevention Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing, 400037, China;1. Swiss Process Safety Consulting GmbH, Schönenbuchstrasse 36, CH-4123, Allschwil, Switzerland;2. Covestro Deutschland AG, Kaiser-Wilhelm-Allee 101–103, D-51373, Leverkusen, Germany |
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| Abstract: | The pipe flange connection is widely applied in chemical, power plants, petrochemical, offshore oil and gas industries, and its strength and tightness are significant for the safe operation. However, there are still no practical and applicable strength and tightness evaluation methods for pipe flange connections working in dramatically varying temperatures. This paper proposed an approach to evaluate the pipeline's strength and sealing performance considering thermal effects in actual operating conditions by combining the experimental measurement and thermostructural analysis. The critical thermodynamic parameters are identified through measured temperature data in operating conditions, and then these parameters are used in the thermostructural analysis to obtain the actual temperature and stress fields. Then, the strength and tightness in complex temperature cases can be evaluated accurately. The pipe flange connection of a liquefied natural gas (LNG) fueling station is analyzed to verify the presented method's effectiveness. This method applies to evaluating the pipeline's strength and tightness and can predict the pipeline's performances under extreme temperatures using the tested data within the measurement range and the corresponding thermostructural analysis. Furthermore, the work in this paper also provides a reference for the design and analysis of pipe flange connections working in complex temperature conditions. |
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| Keywords: | Pipe flange connections Parameter identification Temperature field Structural strength Tightness |
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