Varieties of Flanges - Supplier of Wholesale 2-inch Pipe Flanges from China

Flanges serve as intermediary components connecting tubes. Bolts pass through holes in the flanges to join them securely, while gaskets ensure sealing between them.

Connections between container components come in two types: non-detachable (welding) and detachable. Detachable flange connections are frequently employed between cylinders and heads, pipes and valves, and other components due to production process necessities and for the ease of manufacturing, transportation, installation, and maintenance.

While detachable structures offer various connection methods such as flange, threaded, and socket connections, flange connections reign supreme in chemical and pharmaceutical equipment and pipelines. This preference stems from their unique advantages of reliable sealing, high strength, and broad adaptability.

Structure and Sealing Mechanism of Flange Connections

Working Mechanism: By pre-tightening the bolts, the gasket between the flange sealing surfaces is compressed and secured, filling any uneven gaps on the flange sealing surface to prevent medium leakage through capillary holes within the gasket or interface leakage between the gasket and sealing surface. This process achieves pre-sealing.

The conditions for ensuring the sealing of flange connections are as follows: during pre-tightening, the specific pressure applied to the gasket by the pre-tightening force must not fall below the pre-tightening sealing specific pressure; during operation, the remaining specific pressure acting on the gasket must not drop below the working seal specific pressure.

Types of flanges

Based on the level of integration between the flange and the equipment or pipeline connection:

Integral flange

Flat welding flanges are utilized when temperature and pressure levels are relatively moderate. (The standard outlines Specific temperature and pressure values.)

Butt welding flanges are ideal for critical applications involving high pressure, high temperature, and hazardous substances such as toxic, flammable, or explosive materials. They typically entail higher costs.

Distinguishing Between Flat Welding Flanges and Butt-Welding Flanges:

50. Different Welding Forms: Flat welding seams cannot undergo radiographic inspection, whereas butt-welding seams can. Flat welding comprises two fillet girth welds, while butt welding involves a butt girth weld.
50. The nominal pressure differs: the necked flat welding flange typically ranges from 0.6 to 4.0 MPa, whereas the necked butt-welding flange ranges from 1 to 25 MPa, indicating that the necked flat welding flange is designed for lower pressure levels.
50. Different Connection Methods: Flat welding flanges typically only connect to pipes directly and cannot directly connect to butt-welded pipe fittings. Butt-welded flanges, on the other hand, can directly connect to all types of butt-welded pipe fittings (including elbows, tees, reducers, etc.) and pipes.

Loose flange

Characteristics: Loose flanges are not directly connected to the pipeline or container, making them suitable for low-pressure environments where additional bending stress is unnecessary, particularly for non-ferrous metal and stainless-steel equipment and pipeline shells. When made of carbon steel, they can help conserve precious metals. However, loose flanges typically exhibit poor rigidity.

Threaded flange

It finds extensive use in small-diameter high-pressure pipes, where the flange exerts minimal additional stress on the pipe wall.

Conclusion

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