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Design Innovation

Weight Minimization of Natural Gas Distribution Riser Systems

[+] Author and Article Information
M. S. Attia1

Department of Mechanical Design, Faculty of Engineering, Cairo University, 12613 Giza, Egyptm.attia@utoronto.ca

M. M. Megahed

Department of Mechanical Design, Faculty of Engineering, Cairo University, 12613 Giza, Egyptmmegahed47@yahoo.com

A. Gaber

 Pharaonic Gas Company, 34, Mohamed Mandour St., Nasr City, Cairo, Egypt

1

Corresponding author.

J. Pressure Vessel Technol 131(6), 065001 (Sep 23, 2009) (5 pages) doi:10.1115/1.3148189 History: Received June 03, 2008; Revised December 26, 2008; Published September 23, 2009

This study investigates the optimal piping layout in the installation of residential natural gas riser piping systems subjected to daily temperature fluctuations. Specifically, it is desired to evaluate the optimal safe configuration for minimum weight requirements in the absence of flexible expansion joints between the riser pipe and the branches. Structural optimization is carried out using fully parametric finite element models employing the singular value decomposition algorithm. Thermally induced stresses are examined to identify the optimal layout. The results indicate that the optimal piping layout satisfies strength requirements and achieves significant weight reduction and hence cost saving compared with existing, rule-based configurations.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the six-floor riser structure

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Figure 2

Schematic of wall support

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Figure 3

Free body diagram of a pipe branch under thermal expansion load

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Figure 4

FE model of the riser structure showing various boundary conditions

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Figure 5

Effective stress distribution along the riser height for various layouts

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Figure 6

Effective stress distribution along branch length in various floors in the present layout

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Figure 7

Effective stress distribution along branch length in various floors for Lb=1200 mm

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Figure 8

Effective stress distribution along branch length in optimal layout

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Figure 9

Normalized peak effective stress versus reduction in weight for various layouts

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Figure 10

Schematic of the experimental setup to evaluate limit bending moment

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