The effect of gasket creep-relaxation on the leakage tightness of bolted flanged joints
- Ecole Polytechnique of Montreal, Quebec (Canada). Dept. of Mechanical Engineering
The loss of tightness of bolted flanged joints is primarily due to the relaxation of the joint; in particular, the clamping load is affected by the amount of relaxation that a gasket exhibits over time. Test methods are available for evaluating the ability of a gasket to maintain a given compressive stress. It is necessary, however, to evaluate the response of the joint members to a small change in gasket thickness produced by the effect of creep-relaxation. This paper presents an analytical evaluation of the effect of gasket creep-relaxation on the remaining gasket stress taking into account the flexibility of all joint members, thus allowing the evaluation of the required tightening load on the gasket. The results obtained by this approach are shown to agree with those determined on an experimental rig made up of 4-in. class-600-lb pair of flanges. Axisymmetric finite element models of larger flange assemblies are also used for comparison. The results show that creep-relaxation of gaskets has a major influence on the remaining compression load on the gasket.
- OSTI ID:
- 6562875
- Journal Information:
- Journal of Pressure Vessel Technology; (United States), Vol. 117:1; Other Information: Presented at the Pressure Vessels and Piping Conference, Minneapolis, Minnesota (US), June 19--23, 1994; ISSN 0094-9930
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOLTED JOINTS
GASKETS
PERFORMANCE
CREEP
STRESS RELAXATION
PRESSURE VESSELS
ANALYTICAL SOLUTION
DESIGN
FLANGES
LEAKS
RESPONSE FUNCTIONS
THEORETICAL DATA
THICKNESS
CONTAINERS
DATA
DIMENSIONS
FUNCTIONS
INFORMATION
JOINTS
MECHANICAL PROPERTIES
NUMERICAL DATA
RELAXATION
SEALS
420200* - Engineering- Facilities
Equipment
& Techniques