Selection and use of sealing surface of high-pressure pipe flange

The common sealing surface types of high-pressure pipe flanges include flat surface, raised surface, concave and convex surface and tongue and groove surface. The choice of sealing surface depends on the specific application scenario and sealing requirements.

High-pressure pipe flanges are important components in industrial pipeline connections. The selection of their sealing surfaces is directly related to the sealing performance and safe operation of the pipeline system. The following will introduce in detail several types of sealing surfaces commonly used for high-pressure pipe flanges and their characteristics.

1. Plane sealing surface
The plane sealing surface is the simplest form of sealing surface, with a simple structure and convenient processing. However, since the plane sealing surface only relies on the preload of the bolts to ensure the sealing during connection, it has high requirements for the processing accuracy of the flange and gasket. In addition, the sealing effect of the plane sealing surface may be affected in an environment with high temperature, high pressure or strong corrosive media.

2. Raised surface sealing surface
The raised surface sealing surface is a raised annular surface machined on the flange surface to form a line contact seal with the matching flange surface. This type of sealing surface has good sealing performance and is suitable for occasions with high pressure and certain corrosive media. At the same time, the raised face sealing surface has relatively low requirements for the machining accuracy of the flange and gasket, and it is easier to achieve a good sealing effect.

3. Concave and convex sealing surface
The concave and convex sealing surface consists of a pair of matching concave and convex surfaces, and the sealing is achieved by the close fit of the concave and convex surfaces. This sealing surface form has high sealing performance and pressure bearing capacity, and is suitable for high pressure, high temperature and highly corrosive media. However, it should be noted that the concave and convex sealing surface has high requirements for the machining accuracy and installation quality of the flange.

4. Tenon and groove sealing surface
The tenon and groove sealing surface is a flange connection method that achieves sealing through the cooperation of the tenon and the groove. This sealing surface form combines the advantages of the raised face and the concave and convex surface, and has both high sealing performance and reduced requirements for flange machining accuracy. The tenon and groove sealing surface is suitable for high pressure, high temperature and highly corrosive media environments, especially in occasions where frequent disassembly and installation are required.

Conclusion:

The selection of the sealing surface of the high-pressure pipe flange should be based on the specific application scenario and sealing requirements. Different types of sealing surfaces have their own advantages and disadvantages. Correct selection and use of sealing surfaces are the key to ensuring high-pressure flange connection performance and safe system operation.

Read more:  Classification and structural forms of pipe flange gaskets or Pipe flange size type and selection

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