New Piping Flexibility Rules in ASME B31.3, Appendix P

[+] Author and Article Information
Charles Becht

 Becht Engineering Co., Inc., 22 Church Street, P.O. Box 300, Liberty Corner, NJ 07938chuck@becht.com

David W. Diehl

 COADE Inc., 12777 Jones Road, Suite 480, Houston, TX 77070-4674ddiehl@coade.com

J. Pressure Vessel Technol 128(1), 84-88 (Oct 13, 2005) (5 pages) doi:10.1115/1.2140289 History: Received July 19, 2005; Revised October 13, 2005

Alternative rules for performing flexibility analysis were added, as Appendix P, in ASME B31.3, the Process Piping Code, 2004 edition. These rules are considered to be more comprehensive than before; they were designed around computer flexibility analysis. To determine stress range, the difference in stress states, considering all loads, is computed. This paper describes the new rules, their intent, and provides several example piping stress analyses, comparing the results of an analysis using the Appendix P rules with that using the rules in the base Code.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Simple code compliant model

Grahic Jump Location
Figure 2

“Lift off” model



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