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Research Papers: Design and Analysis

The Accepting of Pipe Bends With Ovality and Thinning Using Finite Element Method

[+] Author and Article Information
AR. Veerappan

Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620015, India

S. Shanmugam1

Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620015, Indiashunt@nitt.edu

S. Soundrapandian

 GB Engineering Enterprises (P) Ltd., Tiruchirappalli, Tamilnadu 620015, India

1

Corresponding author.

J. Pressure Vessel Technol 132(3), 031204 (May 05, 2010) (9 pages) doi:10.1115/1.4001423 History: Received August 07, 2008; Revised March 09, 2010; Published May 05, 2010; Online May 05, 2010

Thinning and ovality are commonly observed irregularities in pipe bends, which induce higher stress than perfectly circular cross sections. In this work, the stresses introduced in pipe bends with different ovalities and thinning for a particular internal pressure are calculated using the finite element method. The constant allowable pressure ratio for different ovalities and thinning is presented at different bend radii. The allowable pressure ratio increases, attains a maximum, and then decreases as the values of ovality and thinning are increased. An empirical relationship to determine the allowable pressure in terms of bend ratio, pipe ratio, percent thinning, and percent ovality is presented. The pipe ratio has a strong effect on the allowable pressure.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

A typical pipe bend

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Figure 2

An illustration of the difference between autogenerated and optimized finite element mesh of pipe bend with 0% thinning and 5% ovality

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Figure 3

A relationship between number of finite elements and stress at different sections of pipe bend

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Figure 4

Allowable P/Sm for the pipe bend with R/D=1 and D/t=5

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Figure 5

Allowable P/Sm for the pipe bend with R/D=1 and D/t=10

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Figure 6

Allowable P/Sm for the pipe bend with R/D=1 and D/t=15

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Figure 7

Allowable P/Sm for the pipe bend with R/D=1 and D/t=20

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Figure 8

Allowable P/Sm for the pipe bend with R/D=4 and D/t=5

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Figure 9

Allowable P/Sm for the pipe bend with R/D=4 and D/t=10

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Figure 10

Allowable P/Sm for the pipe bend with R/D=4 and D/t=15

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Figure 11

Allowable P/Sm for the pipe bend with R/D=4 and D/t=20

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