What are the Factors Affecting the Sealing of Pressure Vessel Flange?

A pipe flange is a butterfly valve-like part that is sealed by a hard disk. Flanges are used in pairs and are the most common component in piping engineering. In piping engineering, flanges are mainly used for pipeline connections. Flange plates are installed in various ways in the pipes to be connected. Wire flanges can be used for low pressure pipelines, and welded flanges are used for pressures above 4kg.

In piping works, flanges are mainly used for pipeline connections, and flange plates are installed in various ways in the pipelines that need to be connected. Wire flanges can be used for low pressure pipelines, and welded flanges are used when the pressure is above 4kg. A sealing point is added between two flanges and then tightened with bolts. Flanges of different pressures have different thicknesses and use different bolts.

Factors affecting the sealing of pressure vessel flanges are as follows:

1. Bolt tightening force

The appropriate preload force can ensure that the sealing gasket in the work can also retain a certain sealing ratio pressure, preload force is too large will be crushed or extrusion of the gasket, but not conducive to sealing. In the case of meeting the space required for fastening and dismantling bolts, the number of bolts should be increased appropriately to ensure the preload is evenly distributed.

2. Performance of sealing gasket

Seal gasket is an important component of flange sealing. Suitable sealing gasket material will produce both the necessary elastic deformation under the action of the appropriate preload force, and will be crushed or extruded sealing surface. At the same time requires the sealing gasket has sufficient resilience, in the high-pressure vessel flange sealing surface between the pressure increases, can be properly deformed to fill the sealing surface, but also to maintain a good seal of the connection surface.

3. High pressure flange sealing surface characteristics

The type of flange sealing surface with more stringent requirements of the working conditions should be used concave and convex surface and tongue and groove surface. The waterline and roughness of the flange sealing surface should meet the specifications and match the sealing gasket.

4. Strength of high pressure vessel flange

Insufficient flange strength will cause the flange to bend and deform, and eventually seal failure. Many factors will affect the flange strength, which strictly control the flange material, increase the thickness of the flange, increase the outer diameter of the flange and other methods can improve the flange stiffness, flange deformation is small, the bolt force will be uniformly transferred to the sealing gasket, in order to obtain a uniform and sufficient sealing specific pressure, which is the key to improve the sealing. Properly reduce the force arm of the bolt force action, can reduce the bending moment of the flange to reduce the seal failure.

5. The working conditions will also affect the flange sealing effect

The higher the temperature, the medium viscosity will become smaller, the possibility of leakage becomes larger; high temperature to increase the chemical and physical activity of the medium, corrosion and dissolution of the gasket and flange increases; high temperature can also make the bolt, flange and seal gasket creep and stress relaxation. Understand the specific conditions of the work to ensure maximum flange sealing effect.

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