Structural Integrity of Flexible Piping Systems Conveying Liquids

[+] Author and Article Information
Felipe BastosFreitas Rachid

Laboratory of Theoretical and Applied Mechanics, Department of Mechanical Engineering, Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, RJ, 24210-240, Brazilrachid@vm.uff.br, rachidfelipe@gmail.com

J. Pressure Vessel Technol 128(3), 341-347 (Jul 13, 2005) (7 pages) doi:10.1115/1.2217966 History: Received June 29, 2005; Revised July 13, 2005

This work presents a structural integrity model for piping systems conveying liquids which takes the axial fluid-structure interaction into account. The model is used to numerically investigate the influence of pipe motion on the degradation of the piping when fast transients are generated by valve slam. The resulting mathematical problem is formed by a system of nonlinear partial differential equations which is solved by means of an operator splitting technique, combined with Glimm’s method. Numerical results obtained for an articulated piping system indicate that high piping flexibility may induce a substantial increase in damage growth along the pipes.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Representation of the Riemann problem solution for initial data given by Eq. 18

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Figure 2

Schematic representation of the piping system

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Figure 3

Pressure histories at the valve for three different constraint conditions of the elbows B and C

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Figure 4

Damage histories at the valve for three different constraint conditions of elbows B and C

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Figure 5

Displacements of the elbows B and C as a function of the time

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Figure 6

Damage distribution in the whole extension of the piping at t=150ms when both elbows are rigid, at t=127ms when elbow B is free and at t=150ms when elbow C is free



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