Flexibility Factors and Stress Indices for Piping Components With D/T ≧ 100 Subjected to In-Plane or Out-of-Plane Moment

[+] Author and Article Information
T. Fujimoto, T. Soh

Kobe Steel, Ltd., Kobe City, Japan

J. Pressure Vessel Technol 110(4), 374-386 (Nov 01, 1988) (13 pages) doi:10.1115/1.3265619 History: Received July 26, 1988; Online November 05, 2009


The finite element analyses are carried out for the several piping components (D /T ≧ 100) subjected to in-plane or out-of-plane moment. For the stress evaluation of the chemical plant piping systems, ANSI B31.3 is usually applied. But the stress intensification factors and flexibility factors in this code are mainly for a heavy-wall-thickness pipe, so it is necessary to reconsider these factors for a thin-wall-thickness pipe with a large diameter. In our study, several finite element analyses using MSC/NASTRAN program were performed on the pipe bends (elbow or miter bend, 0.01 ≦ h ≦ 0.2) and the unreinforced fabricated tees (50 ≦ D /T r ≦ 300, 0.5 ≦ d /D ≦ 0.95, 0.25 ≦ T b /T r ≦ 0.95), and the empirical formulas for the flexibility factors and the stress indices, due to out-of-plane or in-plane moment, were proposed. Experimental stress analyses for the piping components with D /T r = 127 were also carried out, and it was confirmed that the results agreed well with the numerical ones.

Copyright © 1988 by ASME
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