Bolted flanged joint assemblies may begin to leak some time following a successful hydrostatic test. One of the reasons is that the gasket experiences a drop in its initial compressive stress due to creep, thermal dilatation, and thermal degradation. The need to pay attention to the relaxation behavior of bolted joints for high-temperature applications is recognized by the ASME Code, but no specific guidelines are given to help engineers, neither at the design nor maintenance levels. This paper deals with the basic analytical tools that have been used to develop a computer program “SuperFlange” that can be used to make accurate predictions of the relaxation of bolted flanged joints, and hence be able to provide a reasonable leakage assessment over time. A simplified analytical method of relaxation analysis will also be presented. These proposed methods are supported by test results obtained on a real bolted joint fixture and by FE modeling. A strong emphasis will be put on flanged joint rigidity, which is one of the major controlling parameters of relaxation besides the material properties involved.
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February 1997
Research Papers
An Accurate Method of Evaluating Relaxation in Bolted Flanged Connections
A. Bouzid,
A. Bouzid
Department of Mechanical Engineering, Ecole Polytechnique, Case postale 6079, Succ. “C.V.” Montreal, Quebec, H3C 3A7 Canada
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A. Chaaban
A. Chaaban
Department of Mechanical Engineering, Ecole Polytechnique, Case postale 6079, Succ. “C.V.” Montreal, Quebec, H3C 3A7 Canada
Search for other works by this author on:
A. Bouzid
Department of Mechanical Engineering, Ecole Polytechnique, Case postale 6079, Succ. “C.V.” Montreal, Quebec, H3C 3A7 Canada
A. Chaaban
Department of Mechanical Engineering, Ecole Polytechnique, Case postale 6079, Succ. “C.V.” Montreal, Quebec, H3C 3A7 Canada
J. Pressure Vessel Technol. Feb 1997, 119(1): 10-17 (8 pages)
Published Online: February 1, 1997
Article history
Received:
November 7, 1995
Revised:
April 4, 1996
Online:
February 11, 2008
Citation
Bouzid, A., and Chaaban, A. (February 1, 1997). "An Accurate Method of Evaluating Relaxation in Bolted Flanged Connections." ASME. J. Pressure Vessel Technol. February 1997; 119(1): 10–17. https://doi.org/10.1115/1.2842254
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