A Unified Analytical Method of Stress Analysis for Tubesheet-- Part I: Theoretical Foundation

[+] Author and Article Information
Hongsong Zhu

Independent Researcher, ShiDa ErCun, Putuo District, Shanghai 200062, PR China

1Corresponding author.

ASME doi:10.1115/1.4038516 History: Received February 17, 2017; Revised November 13, 2017


The stress analysis method for fixed tubesheet (TS) heat exchanger (HEX) in pressure vessel codes such as ASME VIII-1, EN13445 and GB151 are based on the classical theory of equivalent solid thin plate on elastic foundation in which the TS perforated area is replaced by an equivalent solid plate. Hence, the method as such precludes the pressure effects in TS perforations. The temperature gradient through the TS thickness direction was also ignored in these codes. In addition, aforementioned codes all assume a geometric and loading plane of symmetry at the midway between the two TSs so that only half of the unit or one TS is need be considered. In this study, the mid-plane symmetry assumption is discarded and all aforementioned situations are considered. Based on the classical thin plate and shell theoretical solution, a unified analytical method for stress analysis of fixed TS, floating and U-tube HEX is presented. Theoretical comparison shows that ASME method can be obtained from the special case of the simplified mechanical model of the unified method. Numerical Comparison results indicate that predictions given by the unified method agree well with finite element analysis (FEA), while ASME results are not accurate or not correct. Therefore, it is concluded that the presented method provides a unified method, dealing with thin TS of different types of HEX in equal detail, with confidence to predict design stresses.

Copyright (c) 2017 by ASME
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