New Development in Studies on the Characteristics of Bolted Pipe Flange Connections in JPVRC

[+] Author and Article Information
Toshiyuki Sawa

Department of Mechanical Engineering, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan

Satoshi Nagata

 Toyo Engineering, Narashïno, Chiba, Japan

Hirokazu Tsuji

Department of Intelligent Mechanical Engineering, Faculty of Science and Engineering, Tokyo Denki University, Saitama, Japan

J. Pressure Vessel Technol 128(1), 103-108 (Oct 21, 2005) (6 pages) doi:10.1115/1.2140799 History: Received September 30, 2005; Revised October 21, 2005

This paper deals with some studies carried out in the bolted flanged connection committee (BFC) in Japan Pressure Vessel Council (JPVRC) on the stress analysis of a pipe flange connection using the elastoplastic finite element method. The characteristics of the connections with the different nominal diameters from 2in. to 20in. such as the contact gasket stress distribution, the hub stress, and the load factors were examined. The results from the finite element analyses were fairly consistent with the experimental results concerning the variation in the axial bolt force. By using the contact stress distributions and the results of the leakage test, the new gasket constants were evaluated. As a result, it was found that the variations in the contact stress distributions were substantial due to the flange rotation in the pipe flange connections with the larger nominal diameter. A method to determine the bolt preload for a given tightness parameter was demonstrated and the difference in the bolt preload between our research and PVRC was shown. In addition, the characteristics of pipe flange connection under a bending moment and internal pressure were also discussed and a newly developed bolt tightening method was demonstrated.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

A pipe flange connection with a spiral wound gasket subjected to an internal pressure

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Figure 2

Stress-strain lines of the spiral wound gasket used for the EP-FEA

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Figure 3

The contact gasket stress distributions of the pipe flange connection with the 20in. in the θ direction under internal pressure (θ=0∘–7.5∘)

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Figure 4

The effects of the nominal diameter of the pipe flange connections on the contact gasket stress distributions in the r direction (the case where an internal pressure P=5MPa is applied)

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Figure 5

The effects of the nominal diameter in the pipe flange connections on the hub stress (von Mises’ equivalent stress σm) at the angle θ=0°

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Figure 6

Comparison of an increment in axial bolt force between the experimental and the FEA results

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Figure 7

A method for determining bolt preload Ff. (a ) The case where the results of the FEA are used. (b ) The case of the PVRC procedure.

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Figure 8

Schematic of the pipe flange connection subjected to a bending moment and internal pressure




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