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http://dx.doi.org/10.5855/ENERGY.2017.26.2.019

Identifying Risk Management Locations for Synthetic Natural Gas Plant Using Pipe Stress Analysis and Finite Element Analysis  

Erten, Deniz Taygun (Department of Mechanical Engineering, Graduate School, Chung Ang University)
Yu, Jong Min (Department of Mechanical Engineering, Graduate School, Chung Ang University)
Yoon, Kee Bong (Department of Mechanical Engineering, Chung Ang University)
Kim, Ji Yoon (ETCC(Energy Technology Convergence Center Inc.))
Publication Information
Journal of Energy Engineering / v.26, no.2, 2017 , pp. 1-11 More about this Journal
Abstract
While they are becoming more viable, synthetic natural gas (SNG) plants, with their high temperatures and pressures, are still heavily dependent on advancements in the state-of-the-art technologies. However, most of the current work in the literature is focused on optimizing chemical processes and process variables, with little work being done on relevant mechanical damage and maintenance engineering. In this study, a combination of pipe system stress analysis and detailed local stress analysis was implemented to prioritize the inspection locations for main pipes of SNG plant in accordance to ASME B31.3. A pipe system stress analysis was conducted for pre-selecting critical locations by considering design condition and actual operating conditions such as heat-up and cool-down. Identified critical locations were further analyzed using a finite element method to locate specific high-stress points. Resultant stress values met ASME B31.3 code standards for the gasification reactor and lower transition piece (bend Y in Fig.1); however, it is recommended that the vertical displacement of bend Y be restricted more. The results presented here provide valuable information for future risk based maintenance inspection and further safe operation considerations.
Keywords
SNG; Synthetic Natural Gas; Finite Element Analysis; Pipe Stress Analysis; Maintenance;
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