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Research Papers: Operations, Applications and Components

Analysis of the Thermal Stress at the Tubesheet in Floating-Head or U-Tube Heat Exchangers

[+] Author and Article Information
Jiuyi Liu

Beijing University of Chemical Technology,
15, North Third Ring Road,
Chaoyang District, Beijing 100029, China
e-mail: liujiuyimine@126.com

Caifu Qian

Beijing University of Chemical Technology,
15, North Third Ring Road,
Chaoyang District, Beijing 100029, China
e-mail: qiancf@mail.buct.edu.cn

Huifang Li

Beijing University of Chemical Technology,
15, North Third Ring Road,
Chaoyang District, Beijing 100029, China
e-mail: lihf@mail.buct.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 30, 2015; final manuscript received January 18, 2017; published online February 3, 2017. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 139(2), 021601 (Feb 03, 2017) (7 pages) Paper No: PVT-15-1287; doi: 10.1115/1.4035827 History: Received December 30, 2015; Revised January 18, 2017

Thermal stress is an important factor influencing the strength of a heat exchanger tubesheet. Some studies have indicated that, even in floating-head or U-tube heat exchangers, the thermal stress at the tubesheet is significant in magnitude. For exploring the value, distribution, and the influence factors of the thermal stress at the tubesheet of these kind heat exchangers, a tubesheet and triangle arranged tubes with the tube diameter of 25 mm were numerically analyzed. Specifically, the thermal stress at the tubesheet center is concentrated and analyzed with changing different parameters of the tubesheet, such as the temperature difference between tube-side and shell-side fluids, tubesheet diameter, thickness, and the tube-hole area ratio. It is found that the thermal stress of the tubesheet of floating-head or U-tube heat exchanger was comparable in magnitude with that produced by pressures, and the distribution of the thermal stress depends on the tube-hole area and the temperature inside the tubes. The thermal stress at the center of the tubesheet surface is high when tube-hole area ratio is very low. And with increasing the tube-hole area ratio, the stress first decreases rapidly and then increases linearly. A formula was numerically fitted for calculating the thermal stress at the tubesheet surface center which may be useful for the strength design of the tubesheet of floating-head or U-tube heat exchangers when considering the thermal stress. Numerical tests show that the fitted formula can meet the accuracy requirements for engineering applications.

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References

Gardner, K. A. , 1948, “ Heat Exchanger Tube Sheet Design,” ASME J. Appl. Mech., 15(4), pp. 377–385.
Gardner, K. A. , 1969, “ Tube Sheet Design: A Basis for Standardization,” First International Conference on Pressure Vessel Technology, Delft, The Netherlands, Sept. 29–Oct. 2, pp. 621–648.
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American Standards, 2007, “ Standards of the Tubular Exchanger Manufacturers association,” TEMA, Standard No. TEMA-2007.
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Xu, L. , Qian, C. F. , Liu, J. Y. , and Liu, Z. S. , 2015, “ Thermal Stress Analysis at the Tubesheet of Floating-Head Heat Exchangers,” Pressure Vessel Technol., 32(6), pp. 50–55.
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Figures

Grahic Jump Location
Fig. 1

Mesh of the tubesheet with the minimum number of tubes

Grahic Jump Location
Fig. 2

Geometrical model of the tubesheet with 36 tubes

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Fig. 3

Temperature distributions at the tubesheet with tubes

Grahic Jump Location
Fig. 4

Thermal stress distribution at the tubesheet center along the tubesheet thickness

Grahic Jump Location
Fig. 5

Thermal stress on the shell-side surface center of the tubesheet changing with the tubesheet thickness and tube-hole area ratio when the tubesheet radius is 1 m

Grahic Jump Location
Fig. 6

Thermal stress on the tube-side surface center of the tubesheet changing with the tubesheet thickness and tube-hole area ratio when the tubesheet radius is 1 m

Grahic Jump Location
Fig. 7

Thermal stress on the shell-side surface center of the tubesheet changing with the tubesheet radius and tube-hole area ratio when the tubesheet thickness is 0.22 m

Grahic Jump Location
Fig. 8

Thermal stress on the tube-side surface center of the tubesheet changing with the tubesheet radius and tube-hole area ratio when the tubesheet thickness is 0.22 m

Grahic Jump Location
Fig. 9

Numerical results compared with those obtained from Eq. (2)

Tables

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