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RESEARCH PAPERS

Thermally Induced Deflections in Bolted Flanged Connections

[+] Author and Article Information
Abdel-Hakim Bouzid

 Ecole de Technologie Superieure, Mechanical Engineering Department, 1100, Rue Notre-Dame Ouest, Montreal, Quebec, H3C 1K3, Canadahakim.bouzid@etsmtl.ca

Akli Nechache

 Ecole de Technologie Superieure, Mechanical Engineering Department, 1100, Rue Notre-Dame Ouest, Montreal, Quebec, H3C 1K3, Canadaanechache@mec.etsmtl.ca

J. Pressure Vessel Technol 127(4), 394-401 (May 29, 2005) (8 pages) doi:10.1115/1.2042476 History: Received July 06, 2004; Revised May 29, 2005

Pressure vessel joints operating at high temperature are often very difficult to seal. The existing flange design methods do not address thermal effects other than the variation of flange material mechanical properties with temperature. It is possible to include the effects of temperature loading in joint analysis, however, presently very few guidelines exist for this type of analysis. This paper outlines the theoretical analysis used for the determination of the steady state operating temperature and deflections in bolted flange joints. It details the theoretical equations necessary to predict the temperature profiles and thermal expansion difference between the joint components necessary for the evaluation of the load redistribution for the two cases of a flange pair and a flange with a cover plate. The results from the theoretical models are verified by comparison to finite element results.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Analytical model of a flange pair

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Figure 2

Analytical model of a flange with a cover plate

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Figure 3

Bolted joint FE models; (a) symmetrical flange; (b) flange with cover plate

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Figure 4

Temperature profile in NPS 3 class 150 flange with ΔT=250°C

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Figure 5

Temperature profile in 16in. HE flange with ΔT=400°C

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Figure 6

Temperature profile in 24in. HE flange with ΔT=400°C

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Figure 7

Temperature profile in 52in. HE flange with ΔT=400°C

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Figure 8

Radial expansion in flange NPS 3 with ΔT=250°C

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Figure 9

Radial expansion in 24in. HE flange with ΔT=250°C

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Figure 10

Radial expansion in 36in. HE flange with ΔT=400°C

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Figure 11

Radial expansion in 52in. HE flange with ΔT=400°C

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Figure 12

Radial expansion in 16in. HE flange with ΔT=400°C

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Figure 13

Radial expansion in 52in. HE flange with ΔT=400°C

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Figure 14

Temperature distribution and thermal distortion in NPS 3 class 150 cover plate at ΔT=250°C

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Figure 15

Temperature distribution and thermal distortion in 16in. HE cover plate at ΔT=400°C

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Figure 16

Temperature distribution and thermal distortion in NPS 10 class 300 blind cover plate at ΔT=250°C

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Figure 17

Temperature distribution and thermal distortion in 52in. HE cover plate at ΔT=400°C

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