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Shock and Vibration
Volume 2017 (2017), Article ID 3685675, 13 pages
https://doi.org/10.1155/2017/3685675
Research Article

Modal and Vibration Analysis of Filter System in Petrochemical Plant

1Institute of Internal Combustion Engine, Dalian University of Technology, Dalian, China
2Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Dalian, China
3School of Naval Architecture & Ocean Engineering, Dalian University of Technology, Dalian, China
4Maritime Research Centre and School of Civil and Environmental Engineering, Nanyang Technological University, Singapore

Correspondence should be addressed to Ji Wang; nc.ude.tuld@ijgnaw

Received 17 March 2017; Revised 22 June 2017; Accepted 13 July 2017; Published 22 August 2017

Academic Editor: Hugo Rodrigues

Copyright © 2017 Zhongchi Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Filter systems are widely used in petrochemical plants for removing solid impurities from hydrocarbon oils. The backwash is the cleaning process used to remove the impurities on the sieves of the filters without a need to interrupt the operation of the entire system. This paper presents a case study based on the actual project of a filter system in a petrochemical plant, to demonstrate the significant effect of vibration on the structural integrity of piping. The induced vibration had led to the structural fatigue failure of the pipes connecting the filter system. A preliminary assessment suggested that the vibrations are caused by the operation of backwashing of the filter system. A process for solving the vibration problem based on the modal analysis of the filter system using the commercial finite element software for simulation is therefore proposed. The computed natural frequencies of the system and the vibration data measured on site are assessed based on the resonance effect of the complete system including the piping connected to the filters. Several approaches are proposed to adjust the natural frequencies of the system in such a way that an optimal and a reasonable solution for solving the vibration problem is obtained.