Classification and technical conditions of pressure vessel flanges

Classification and technical conditions of pressure vessel flanges

According to different levels of pressure, butt welding flange gaskets also have different materials, from low pressure asbestos gaskets, high pressure asbestos gaskets to metal gaskets. Butt-welded flanges are manufactured and produced by different methods and processes in actual production and development, according to the process methods and principles, which have important values and effects on different aspects, and add certain elements to the actual production. The characteristics and value of carbon steel flanges show good use characteristics and value. The flange connection is easy to use and can withstand greater pressure.

Pressure vessels are the most widely used equipment in the petrochemical industry and one of the main production tools in the petrochemical industry. Due to process requirements and the installation and maintenance of equipment internals, pressure vessels often need to be equipped with vessel flanges (such as common shell and tube heat exchangers, reactors, towers, filters, etc.).

When a pre-tightening force is applied to the flange bolts, the bolt force compresses the gasket through the flange ring, forcing the flange gasket to produce compression deformation. When the bolt force reaches a certain value, the flange sealing surface and the four bumps on the gasket are forced to fill up with the deformation of the gasket, which creates an initial sealing condition for preventing the leakage of the fluid medium. At this time, the pressing force per unit effective sealing area of the gasket is called the initial sealing specific pressure of the gasket. When the equipment or pipeline bears the pressure of the medium, the bolts are stretched under tensile stress, the flange sealing surface moves in the direction of separation from each other, the compression force between the sealing surface and the gasket decreases, and the compression of the gasket decreases. The specific pressure of the pre-tightened seal drops. If the gasket has sufficient resilience at this time, the deformation of the gasket can compensate for the separation value of the bolt and the sealing surface, and the pre-tightened seal specific pressure only drops to not less than the working seal specific pressure, the flange remains in good condition The sealed state. Conversely, if the resilience of the gasket is insufficient, the specific pressure of the seal drops below the specific pressure of the working seal, or even a gap appears in the seal port, the seal will fail.

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