What do the gasket coefficient m and the pressure y represent in the design calculations for flanges?
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What do the gasket coefficient m and the pressure y represent in the design calculations for flanges? Solve
Simply put, the larger the value of my, the greater the compressive force required; this may lead to higher requirements regarding the type, quantity, or material of the bolts, and accordingly, the flange thickness will also need to be greater.
It is the minimum pressure exerted per unit area on the gasket when a shimming material is used to counteract the pressure y, thereby creating initial sealing conditions. Physically, this pressure forces the surface of the gasket to fit into the microscopic irregularities on the flange’s sealing surface, filling those gaps and eliminating any potential leakage paths. The gasket coefficient m is the ratio of the minimum compressive force applied per unit of effective sealing area to the internal pressure; physically, it represents the sufficient resistance that must exist between the gasket and the flange to prevent leakage at the sealing surface.
y is the gasket specific pressure, which is used in calculating the compressive force on the gasket under pre-tightening conditions; m is the gasket coefficient, which is used in calculating the compressive force on the gasket under operating conditions