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Credibility ,Flange angle deflection due to the three coordination deformation by 2010 ASME VIII a stiffness refers to the number and limited angular rotation of flange bending of bending deformation occurs in the bolt assembly load, internal pressure (operation) and a gasket counter force under the action of the flange body, a gasket non-uniform compression and bolts. For integral flange and angle limit of not more than 0.3 on flange rotation limit, the appearance is on the body of the flange bending stiffness is proposed, but the fundamental purpose is to guarantee the close of the flange; because of the greater the corner flange, gasket along the width of the pressure should stress distribution is not uniform, and even lead to the outboard gasket stress and crushing, the effective sealing width, increase the leakage rate. Therefore, the flange seal must be guaranteed from two aspects of the limitation of the gasket stress and the flange angle. Table 23 lists the corner of the combined flange under different conditions.
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