Fluted flange is a mechanical connection, mainly used for the connection between pipeline systems or equipment, the following is a detailed introduction:

Structural characteristics

Basic structure

Fluted flanges usually include a round disk-like body surrounded by bolt holes for mounting bolts. Annular grooves on one or both sides of the flange. The shape and size of these slots are designed according to the specific sealing requirements and the type of pipe connected.

For example, the groove flanges used in some industrial pipes may have a depth of a few millimeters to more than ten millimeters, and the width will vary according to different standards.
Compared with ordinary flanges

Compared with ordinary flat flanges, the main feature of fluted flanges is its groove. Ordinary flanges mainly rely on plane sealing. Gaskets are placed between flanges and fastened by bolts to deform the gaskets to achieve sealing effect. The grooved flange is to place the seal (such as rubber seal ring, etc.) in the groove, which makes the seal more stable and not easy to shift during installation and use.
Two, sealing principle
The seal with a grooved flange is achieved by fitting a suitable seal (usually an elastic seal ring) into the groove. When two grooved flanges are bolted together, the seal is squeezed between the grooves of the two flanges and is tightly attached to the surface of the connected pipe or equipment.

For example, in some fluted pipe systems, the rubber seal in the fluted flange will elastic deformation under pressure, filling the tiny gap between the flange and the pipe, preventing liquid leakage. Due to the limiting effect of the groove on the seal, the seal will not be easily squeezed out because of the pressure of the medium in the pipeline or the external vibration and other factors, so as to ensure good sealing performance.

Classification

Sort by the shape of the slot

U-shaped groove flange: The groove of this flange is U-shaped, and it can accommodate seals with circular sections. The U-shaped groove can provide a good space for the seal, so that the seal can be evenly deformed when it is squeezed, and it is often used in medium-low pressure pipeline systems, such as water supply and drainage systems.

V-groove flange: The groove shape of the V-groove flange is V-shaped, which is generally used for occasions requiring higher sealing performance. This type of groove in the fastening process can make the seal produce large deformation, and the flange and the connecting parts are more closely fitted, suitable for the chemical industry, petroleum and other industries to transport corrosive or high temperature and high pressure media pipeline system.

Classified by connection type

Welded flange with groove: The flange is connected to the end of the pipeline by welding. This connection method can provide a high connection strength, suitable for high temperature, high pressure or high stability of the pipeline system requirements. For example, in steam piping systems in thermal power plants, welded fluted flanges can ensure that steam is safely transported under high temperature and pressure without leakage or loose connections.

Threaded connection with groove flange: It is connected between the flange and the pipe through the thread. This method is easy to install and disassemble, and is generally used for low-pressure, small-caliber pipe systems, such as some small instrument connection pipes or household heating systems.

Application field

Chemical industry

In chemical production, various corrosive chemical media need to be transported in pipelines. Fluted flanges can effectively prevent the leakage of these media and ensure production safety. For example, in the pipeline system for conveying strong acids such as sulfuric acid and hydrochloric acid, the use of fluted flanges made of corrosion-resistant materials (such as stainless steel fluted flanges), and with appropriate seals, can ensure the tightness of the pipeline system.

Oil industry

The process of oil exploitation and refining involves a lot of high temperature and high pressure environment. Fluted flanges are used for oil well pipeline connection, pipeline system in oil refining unit, etc. In the deep-sea oil exploitation, the fluted flange also needs to have good seawater corrosion resistance and high pressure sealing performance to cope with the complex Marine environment.

Water supply and drainage system

Fluted flanges are used to connect pipes of different diameters in urban water supply and drainage pipe networks. Due to the relatively low pressure of the water supply and drainage pipe, it is generally made of cast iron or plastic with fluted flanges, which can provide a reliable seal to prevent sewage leakage or groundwater infiltration.