0
RESEARCH PAPERS

Comparison of Residual Stresses in the Mechanical Roll Expansion of HX Tubes Into TEMA Grooves

[+] Author and Article Information
Dennis K. Williams

 Sharoden Engineering Consultants, P.A. P.O. Box 1336, Matthews, NC 28106-1336DennisKW@sharoden.com

J. Pressure Vessel Technol 129(2), 234-241 (Feb 05, 2007) (8 pages) doi:10.1115/1.2716426 History: Received January 23, 2006; Revised February 05, 2007

The mechanical roll expansion of heat exchanger tubes into tubesheets containing TEMA grooves, which are thought to aid in the mechanical integrity of the tube-to-tubesheet (TTT) joint, has for many years provided an acceptable means of completing a TTT joint. Inherent with the intentional roll expansion of the tube is the creation of a tensile residual stress field within the tube that is greatest in the transition region between the expanded and unexpanded zones of the tube. An additional complicating factor in the tube-to-tubesheet joint design is the choice of utilizing a seal weld or a “full strength” weld at the tube end in conjunction with a level of roll expansion quantified by the degree of tube wall reduction. This paper presents the results of an initial study of the mechanical roll expansion of 1in. diameter tubes into a typical TEMA-R designed tubesheet, utilizing two grooves in the tubesheet hole. Two combinations of tube and tubesheet materials are studied that include duplex stainless steel tubes and tubesheet, while the second combination includes type 321 tubes roll expanded into a 214 Cr-1 Mo tubesheet, clad with 321 SS overlay. The residual stress fields are calculated by the finite element method and employ a simplified two-dimensional nonlinear axisymmetric model.

FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Tube to tubesheet geometry

Grahic Jump Location
Figure 2

Finite element mesh

Grahic Jump Location
Figure 3

FEA mesh in grooves region

Grahic Jump Location
Figure 4

Radial displacement on O.D.

Grahic Jump Location
Figure 5

Radial displacement on I.D.

Grahic Jump Location
Figure 6

Radial stress contour

Grahic Jump Location
Figure 7

Axial stress contour

Grahic Jump Location
Figure 8

Hoop stress contour

Grahic Jump Location
Figure 9

Shear stress contour

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In