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Research Papers: Design and Analysis

Analytical Modeling of the Strength of Tubesheets for Steam Surface Condensers

[+] Author and Article Information
Yurong He

Associate Professor
e-mail: rong@hit.edu.cn
Department of Energy and
Environment Engineering,
Harbin Institute of Technology,
Harbin 150001, China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 20, 2012; final manuscript received February 22, 2013; published online September 17, 2013. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 135(5), 051206 (Sep 17, 2013) (9 pages) Paper No: PVT-12-1020; doi: 10.1115/1.4024440 History: Received February 20, 2012; Revised February 22, 2013

A tubesheet is one of the most important components in the design of a steam surface condenser. In this work, an analytical method to determine the strength of a tubesheet is established based on a beam-strip model. The validation of this beam-strip model is confirmed through a finite-element method (FEM) with the same boundary conditions and mechanical properties of the tubesheet. Effects of various parameters that affect the strength of the tubesheet are analyzed, including the tubesheet thickness, applied loading, fixity type, and length of the unperforated zone. The modeling results show that the most significant factor influencing the maximum stress that the tubesheet can bear is the tubesheet thickness, while other parameters have a weaker impact. From an engineering point of view, the beam-strip model is a useful method for the design of tubesheet.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Local section of a tubesheet and beam-strip with tubes arranged in a triangular pattern

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Fig. 2

Section A–A through the beam-strip

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Fig. 3

Schematic of the structural model for the beam-strip

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Fig. 4

Moment and deflection curves along the beam-strip

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Fig. 5

Structure and discretization of the tubesheet with tubes

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Fig. 6

Stress distribution of the beam-strip using a finite-element method

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Fig. 7

Deflection of the beam-strip using a finite-element method

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Fig. 8

Stresses along the length between the finite-element and beam-strip models

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Fig. 9

Deflection along the length between the finite-element and beam-strip models

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Fig. 10

Moment and deflection curves for the beam-strip for various tubesheet thicknesses

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Fig. 11

Maximum moment and stress variation varying with tubesheet thickness

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Fig. 12

Moment and deflection curves for the beam-strip at various boundary conditions

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Fig. 13

Maximum moment and stress variation with percentage of fixed boundary conditions

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Fig. 14

Moment and deflection curves for the beam-strip at various water test pressures

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Fig. 15

Maximum moment and stress variation with water test pressure

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Fig. 16

Moment and deflection curves for the beam-strip at various unperforated lengths

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Fig. 17

Maximum moment and stress variation with unperforated length

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