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Research Papers: Design and Analysis

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

[+] Author and Article Information
Hongsong Zhu

ShiDa Ercun, Putuo District,
Shanghai 200062, PR China
e-mail: Hongsongzhu@126.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 17, 2017; final manuscript received November 13, 2017; published online December 18, 2017. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 140(1), 011203 (Dec 18, 2017) (11 pages) Paper No: PVT-17-1037; doi: 10.1115/1.4038516 History: Received February 17, 2017; Revised November 13, 2017

Based on a brief review of existing tubesheet (TS) design standards and the pertinent technical literature, a unified analytical method of stress analysis for fixed TS heat exchangers (HEXs), floating head and U-tube HEXs is proposed by removing the midplane symmetry (MPS) assumption, which assumes a geometric and loading plane of symmetry at the midway between the two TSs so that only half of the HEX or one TS needs be considered. The unified method can be successfully extended to the situations for different TS materials, unequal TS thicknesses, different TS edge conditions, different TS temperatures, pressures drop and dead weights on two TSs. The effects of pressure in TS perforations and temperature gradient in TS thickness direction are also considered by the unified method. Theoretical comparison shows that ASME method can be obtained from the special case of the simplified mechanical model of the unified method. Numerical comparison indicates that predictions given by the unified method agree well with finite element analysis (FEA), while ASME results are not accurate or not correct.

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References

Gardner, K. A. , 1948, “ Heat Exchanger Tubesheet Design,” ASME J. Appl. Mech., 15(4), pp. 377–385.
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ASME, 2015, “ Section VIII-Division 2-2015,” American Society of Mechanical Engineers, New York.
EN, 2014, “ Unfired Pressure Vessels, 2014,” European Committee for Standardization, Brussels, Belgium, Standard No. BS EN 13445-8:2014+ A1:2014.
CODAP, 2015, “ Code for Construction of Unfired Pressure Vessels,” SNCT, Lyon, France, Standard No. SNCT CODAP-2015.
BSI, 2014, “ Specification for Unfired Fusion Welded Pressure Vessels,” British Standards Institution, London, Standard No. BS PD5500-2014.
Zhu, H. , Zhai, J. , Wang, H. , and Zheng, Y. , 2016, “ A Proposed General Method of Stress Analysis for Tubesheet of Heat Exchanger,” ASME J. Pressure Vessel Technol., 138(6), p. 061201.
Hongsong, Z. , 2017, “ A Unified Analytical Method of Stress Analysis for Tubesheet—Part II: Case Study,” ASME J. Pressure Vessel Technol., accepted.
Barron, R. F. , and Barron, B. R. , 2011, Design for Thermal Stresses, Wiley, Hoboken, NJ, pp. 289–291; 294; 433. [CrossRef]

Figures

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Fig. 1

Vertically mounted fixed TS HEX

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Fig. 2

Sketch of different types of floating TS

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Fig. 3

Superposition procedure for the calculation of pressure in TS perforations

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Fig. 4

Tube to TS weld location

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Fig. 5

Sketch of temperature distribution in TS perforated plate in thickness direction

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