Reliability-Based Maintenance Strategies for Heat Exchangers Subject to Fouling

[+] Author and Article Information
A. K. Sheikh, S. M. Zubair, M. U. Haq, M. O. Budair

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

J. Energy Resour. Technol 118(4), 306-312 (Dec 01, 1996) (7 pages) doi:10.1115/1.2793878 History: Received September 15, 1995; Revised September 16, 1996; Online November 06, 2007


Fouling in heat exchangers is an unavoidable by-product of the heat transfer process. The decision regarding periodic maintenance (cleaning) of the exchangers subject to fouling is generally based on thermal and economic behavior of the process. In this paper, a reliability-based maintenance strategy is discussed by incorporating the risk and scatter parameters of the linear random fouling growth model. In addition, the dimensionless cost-objective function is formulated by considering various cost elements for a heat exchanger used in a crude oil preheat train. The variation in the dimensionless cost Γ with reduced time tp /(tp + t down ) is presented for different values of unit cost parameters γ1 , γ2 , and γ3 representing additional fuel cost, antifoulant cost, and miscellaneous costs, respectively. Furthermore, the optimal cleaning cycle of the heat exchanger recently investigated by Casado (1990) is demonstrated to be a special case of the results presented in the paper.

Copyright © 1996 by The American Society of Mechanical Engineers
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