SW6 calculation of flange problems
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When calculating using SW6 flanges, should the inner diameter of the flange be reduced by 2 times the corrosion allowance? Also, is the inner diameter of the gasket flange the inner diameter of the input cylinder, or the inner diameter of the flange ring?
When using SW6 to calculate flanges, the inner diameter of the flange should be reduced by 2 times the corrosion allowance. As for the inner diameter of the gasket flange, the inner diameter of the cylinder should be entered. .
Corrosion needs to be taken into account, as well as the inner diameter of the gasket flange; this inner diameter is important when making the input
I checked the calculation sheet; the parameters that are directly affected by this inner diameter value include: the axial force FD caused by the internal pressure on the cross-section of the flange’s inner diameter, and the distance LA from the center of the bolt to the larger end of the neck (LA is used in the calculations of both the lever arms LD and LT). From the stress analysis perspective, this value should be the inner diameter of the cylinder plus 2 times the corrosion allowance. When the gasket flange is used to fill the inner diameter of the flange ring, FD increases (as the square of DI), while LA decreases (and may fall below the minimum requirements specified in GB150).
The gasket flange should be filled to the inner diameter of the cylinder