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Design Innovation Papers

Design and Analysis of Buried Liquid Petroleum Gas Storage Bullets Supported on Multiple Saddles (PVP2010-25052)

[+] Author and Article Information
Radoslav Stefanovic

Fluor Canada, 55 Sunpark Plaza SE, Calgary, AB, T2X 3R4, Canadaradoslav.stefanovic@fluor.com

Yaser Noman

Jacobs Canada, 205 Quarry Park Boulevard SE, Calgary, AB, T2C 3E7, Canadayaser.noman@jacobs.com

J. Pressure Vessel Technol 134(3), 035001 (May 18, 2012) (6 pages) doi:10.1115/1.4005889 History: Received April 20, 2011; Revised December 22, 2011; Published May 17, 2012; Online May 18, 2012

The use of large, high pressure liquid petroleum gas (LPG) storage bullets has become a common, and often assumed safe, practice in the petrochemical industry. The Engineering Equipment and Materials Users Association (EEMUA) is an organization that has attempted to address design aspects related to mounded or buried bullets; Publication No. 190 published by the EEMUA (2000, Guide for the Design, Construction and Use of Mounded Horizontal Cylindrical Vessels for Pressurized Storage of LPG at Ambient Temperatures, EEMUA, London, England.) became a standard practice in the industry. However, the design recommended, and therefore addressed, by Publication 190 is for bullets directly supported by soil (i.e., without saddle supports). However, it has been noticed by the authors that many users are requesting these storage bullets be supported by saddles resting on foundations in order to minimize the chance of unexpected settling and any motion of the bullets underground. The large span of these bullets requires more than two saddles adding to the complexity of the design due to statically indeterminate construction, differential settlement, and uneven supports. This paper focuses on major issues related to the design of such bullets. First, the loads induced by mound weight, pressure due to mound, and the loads due to longitudinal thermal expansion and soil resistance to this expansion is analyzed. Next, a method for calculating the multiple saddle reactions and bending moments at spans and supports is provided. A simplified method for assessing the effect of differential settlement between saddles is proposed.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Mounded underground bullet

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Figure 2

Mound contribution to load

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Figure 3

Three moment theorem

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Figure 4

Moment and shear force diagrams

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