Research Papers: Design and Analysis

The Effect of Cylinder and Hub Creep on the Load Relaxation in Bolted Flanged Joints

[+] Author and Article Information
Akli Nechache

 Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadaanechache@mec.etsmtl.ca

Abdel-Hakim Bouzid

 Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadahakim.bouzid@etsmtl.ca

J. Pressure Vessel Technol 130(3), 031211 (Aug 07, 2008) (9 pages) doi:10.1115/1.2937739 History: Received April 22, 2006; Revised January 04, 2007; Published August 07, 2008

The leakage tightness behavior of bolted flange joints is compromised due to the high temperature effects and, in particular, when creep of the materials of the different components of the bolted flanged joint takes place. The relaxation of bolted flanged joints is often estimated from the creep of the gasket and the bolts. The creep behavior of the flange ring, the hub, and the cylinder is often neglected. Apart from an acknowledgement of relaxation due to the creep, the designer has no specific tools to accurately assess this effect on the bolt load relaxation. The objective of this paper is to present an analytical approach capable of predicting the bolt load relaxation due to the creep of the flange ring, hub, and cylinder. The proposed approach is compared to the 3D finite element models of different size flanges. An emphasis will be put toward the importance of including creep of the hub and cylinder in high temperature flange designs.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 5

Stress relaxation in NPS 36 flange

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Figure 4

Stress relaxation in 52 HE flange

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Figure 3

Mechanical behavior of gasket materials

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Figure 1

Bolted flange model

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Figure 10

Gasket stress relaxation

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Figure 9

Bolt stress relaxation in 120 in HE flange

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Figure 8

Bolt stress relaxation in 52 in HE flange

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Figure 7

Bolt stress relaxation in 36 in HE flange

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Figure 6

Bolt stress relaxation in NPS 3 class 150 flange

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Figure 11

Gasket stress relaxation



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