Technical Briefs

A Novel Comparison of Design-by-Analysis Methods

[+] Author and Article Information
Mark Stonehouse

Becht Engineering Canada, Ltd., 110–259 Midpark Way, S.E., Calgary, AB, Canadamstonehouse@becht.com

Trevor G. Seipp

Becht Engineering Canada, Ltd., 110–259 Midpark Way, S.E., Calgary, AB, Canadatseipp@becht.com

Shinichiro Kanamaru

JGC Corporation, 2–3–1, Minatomirai, Nishiku, Yokohama, JapanKanamaru.shinichiro@jgc.co.jp

Shawn Morrison

M5 Engineering, Calgary, AB, Canadas.w.morrison@shaw.ca

J. Pressure Vessel Technol 134(5), 054502 (Sep 10, 2012) (4 pages) doi:10.1115/1.4006343 History: Received February 28, 2011; Revised February 08, 2012; Published September 10, 2012; Online September 10, 2012

There exist some atypical loads on pressure vessels during transportation. This is particularly true when the pressure vessel weighs over 500 tonnes. In this example vessel, the transportation was via rail on a “Schnabel car,” in which the vessel is suspended horizontally between the top nozzle and the skirt, and a significant axial compressive load is applied. During the evaluation of the stresses in the top head, a particularly novel situation was encountered which brought about some interesting issues with regards to the three design-by-analysis methods: elastic, limit load, and elastic-plastic. This paper discusses the comparison between all three of these design-by-analysis methods, and provides recommendations for which is most appropriate for this type of evaluation. Additional recommendations and warnings are provided for the use of the elastic and limit load methods as well.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Vessel arrangement on Shnabel Car

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Figure 2

Geometry of FEA model

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Figure 3

Finite element mesh

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Figure 4

Boundary conditions and reference coordinate systems

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Figure 5

Cross-section of the nozzle-to-head junction showing the stress classification line (To view this figure in color, please go to the online version.)

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Figure 6

Cross-section of the nozzle to head junction showing the plastic strain immediately prior to collapse

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Figure 7

Load (Y-direction) versus displacement (inches)



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