Abstract
AbstractIn any pressure system, joints are the weakest region. Sealing characteristics is an important parameter for having a safe operation in gasketed flange joints, in addition to structural integrity. The flange joints are usually designed for operating and hydrostatic pressure, which are constant. But in operating condition, these systems are subjected to different working cycle causing the internal fluid pressure and temperature to vary in a periodic manner with respect to time. The sealing behaviour of these joints, depends mainly on the compressive stress distribution in gasket under loading and unloading cycles. In the present work, 3-D finite element model of the flange joint is developed and analysed for varying internal fluid pressure. The heterogeneous model of spiral wound gasket is developed, considering the individual elasto-plastic behaviour of spiral ring and filler materials. The sealing characteristics of the joint is analysed for a specific cycle. The distribution of gasket stress along the radial direction is observed and the probability of leakage is analysed. The realistic distribution of contact stress in gasket is obtained using heterogeneous modelling. The sealing capability of the gasket is observed to reduce under cyclic loading, due to the accumulation of permanent deformation.KeywordsCyclic pressureSpiral wound gasketContact stressSealing behaviourFlange joint
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