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Research Papers: Design and Analysis

Stress Analysis and Sealing Performance Evaluation in Rectangular Box-Shape Bolted Flange Connection With Gasket Subjected to Internal Pressure

[+] Author and Article Information
Toshiyuki Sawa

Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima-shi, Hiroshima, 739-8527, Japansawa@mec.hiroshima-u.ac.jp

Ryo Kurosawa

 Yokogawa Electric Corporation, 9-32, Nakacho 2-chrome, Musashino-shi, Tokyo 180-8750,Japanryou.kurosawa@jp.yokogawa.com

Wataru Maezaki1

 University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi, 400-8510 Japan

1

Present address: Japan Patent Office.

J. Pressure Vessel Technol 133(2), 021201 (Jan 31, 2011) (8 pages) doi:10.1115/1.4001651 History: Received January 31, 2007; Revised March 30, 2010; Published January 31, 2011; Online January 31, 2011

The contact gasket stress distributions in a rectangular box-shape bolted flange connection with a compressed sheet gasket subjected to internal pressure were analyzed using the finite element method. Leakage tests were also conducted for an actual rectangular box-shape bolted flange connection with a compressed sheet gasket under internal pressure. Using the obtained contact gasket stress distributions and the results of the leakage tests, the new gasket constants were calculated. The difference in the new gasket constants between the values obtained from the present study and those from the Pressure Vessel Research Council (PVRC) procedure was substantial. In addition, a method to determine the bolt preload for a given tightness parameter was demonstrated and the difference in the determined bolt preload was shown between the present study and the PVRC procedure. The characteristics of the rectangular box-shape bolted flange connection were demonstrated by comparing those of circular bolted flange connections.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A rectangular box-shape bolted flange connection with a compressed sheet gasket subjected to internal pressure

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Figure 2

An example of one-fourth mesh divisions used in the FEM calculations

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Figure 3

Boundary conditions used in the FEM calculations: (a) case of initial clamping state and (b) case where an internal pressure P is applied

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Figure 4

Stress-strain curves of the compressed sheet gasket used in FEM calculations

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Figure 5

A model of the circular flange connection used in FEM calculations

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Figure 6

Dimensions of the rectangular flange, the cover, the compressed asbestos sheet gasket and the bolt used in the experiments: (a) rectangular box-shape flange, (b) cover, and (c) compressed sheet gasket

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Figure 7

Schematic of the experimental setup of the rectangular flange connection used in the experiments

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Figure 8

Comparisons of the contact gasket stress distributions in the x- and y-directions: (a) y-direction (x=35,50, y=0–80, z=0.75) and (b) x-direction (x=0–28, y=80,100, z=0.75)

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Figure 9

Position of the contact gasket stress distributions calculated in the FEM

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Figure 10

Comparisons of the contact gasket stress distributions between the x- and y-directions: (a) x-direction (x=35–50, y=15,45,75, z=0.75) and (b) y-direction (x=0,28, y=80–100, z=0.75)

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Figure 11

Effect of the internal pressure on the contact stress distributions in the rectangular flange connection: (a) x-direction (x=35–50, y=75, z=0.75) and (b) y-direction (x=0, y=80–100, z=0.75)

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Figure 12

Comparisons of the contact stress distributions between the rectangular flange connection and the circular flange connection (rectangular: x=0, y=80–100, z=0.75; circular: r=76–92.5, θ=0, z=0.75)

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Figure 13

Results of leakage test in the rectangular box-shape bolted flange connection with the gasket

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Figure 14

A method for determining the bolt preload in the rectangular box-shape flange connection in the present study: (a) the relationship between the gasket stress and the internal pressure and (b) the relationship between the gasket stress and the tightness parameter

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Figure 15

Comparisons of the initial tightness parameter between the present study and PVRC procedure

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