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RESEARCH PAPERS

U-Tube Heat-Exchangers: New Common Design Rules for ASME, CODAP, and EN 13445 CODES

[+] Author and Article Information
F. Osweiller

 Centre Technique des Industries Mécaniques, Senlis, France

J. Pressure Vessel Technol 128(1), 95-102 (Oct 20, 2005) (8 pages) doi:10.1115/1.2138061 History: Received August 31, 2005; Revised October 20, 2005

In the year 2000, ASME Code Section VIII—Div. 1, CODAP (French Code) and EN 13445 (European Standard for Unfired Pressure Vessels) have adopted the same rules for the design of U-tube tubesheet heat exchangers. Three different rules were proposed, based on a different technical basis, to cover: —Tubesheet gasketed with shell and channel; —Tubesheet integral with shell and channel; —Tubesheet integral with shell and gasketed with channel or the reverse. At the initiative of the author, a more refined and uniform technical approach has been developed, to cover all tubesheet configurations. The paper explains the rationale for this new design method which has been incorporated recently in ASME, CODAP, and EN 13445. This is substantiated with comparisons to TEMA Standards and a benchmark of numerical comparisons

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configurations of tubesheets in ASME, CODAP, and EN 13445: (a) Configuration a: Tubesheet integral with shell and channel; (b) Configuration b: Tubesheet integral with shell and gasketed with channel, extended as a flange; (c) Configuration c: Tubesheet integral with shell and gasketed with channel, not extended as a flange; (d) Configuration d: Tubesheet gasketed with shell and channel; (e) Configuration e: Tubesheet gasketed with shell and integral with channel, extended as a flange; (f) Configuration f: Tubesheet gasketed with shell and integral with channel, not extended as a flange

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Figure 2

Analytical model for tubesheet integral both sides (a)

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Figure 3

Ligament efficiency

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Figure 4

Analytical model for tubesheet integral with channel and gasketed with shell (configuration e)

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Figure 5

Analytical model for tubesheet gasketed both sides (configuration d)

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