Research Papers: Pipeline Systems

Cover Requirement and Stability of Horizontally Bent Buried Pipelines

[+] Author and Article Information
Hamdan N. Al-Ghamedy

Department of Civil Engineering,  King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabiahghamdi@kfupm.edu.sa

Sahel N. Abduljauwad, Junaid A. Siddiqui, Naser A. Al-Shayea, Ibrahim M. Asi

Department of Civil Engineering,  King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

J. Pressure Vessel Technol 134(2), 021701 (Jan 13, 2012) (12 pages) doi:10.1115/1.4005395 History: Received January 23, 2011; Revised September 07, 2011; Published January 13, 2012; Online January 13, 2012

A method of calculating soil cover requirements for horizontally bent buried pipelines is described. In sequence, the results of a comprehensive three-dimensional finite element analysis are used to develop regression models for two dependent variables: maximum allowed temperature change and minimum overburden height. Other variables considered include the pipe diameter and thickness, the radius and angle of the bend, the internal pressure, the fluid specific weight, and the material used. Relationships among the different variables are determined. Finally, the results are checked with respect to several buckling modes to consider elastic instability conditions.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Meshes used to examine the effect of the mesh density for horizontal bends

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Figure 2

Effect of mesh density on the results of the horizontal movement of buried pipes

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Figure 3

Comparison of current study with laboratory test results for lateral movement of pipes

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Figure 4

Typical buried horizontal pipe bend

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Figure 5

Soil reaction against movement of buried horizontal bend

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Figure 6

Location of mesh boundaries

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Figure 7

Two-dimensional mesh made to extrude a 3D horizontal bend mesh

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Figure 8

Buried pipe horizontal bend mesh



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