Flange pipe fittings introduction

The flange is also called flange or flange. The part that connects the pipe to the pipe, is connected to the pipe end. There are holes in the flanges, and bolts make the two flanges tightly connected. The flanges are sealed with gaskets. The flange is a disc-shaped part, the most common in pipeline engineering, flanges are used in pairs. In pipeline engineering, flanges are mainly used for the connection of pipelines. At the end where two pipes need to be connected, a flange plate is installed on each side. Wire flanges can be used for low-pressure pipes, and welded flanges can be used for pressures above 4 kg. Add a gasket between the two flanges and fasten them with bolts.

Different pressure flanges have different thicknesses and use different bolts.

When pumps and valves are connected to pipelines, parts of this equipment are also made into corresponding flange shapes, also known as flange connections.

Any connecting parts that are bolted at the periphery of two planes and closed at the same time are generally called "flanges", such as the connection of ventilation ducts, such parts can be called "flange parts".

The threaded flange is a type of flange. The threaded flange connection structure is an assembly consisting of a pair of flanges, several bolts, nuts, and a gasket.

Applications of flange pipe fittings

The part that connects the pipe to the pipe, cis connected to the pipe end. There are holes in the flanges, and bolts make the two flanges tightly connected. The flanges are sealed with gaskets. Flanged pipe fittings refer to pipe fittings with flanges (flanges or pans). It can be cast (not shown in the figure), or it can be threaded or welded. Flange connection (flange, joint) consists of a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the surface of the gasket will deform when it reaches a certain value, and fill the unevenness on the sealing surface to make the connection tight and leak-proof. A flange connection is a detachable connection. According to the connected parts, it can be divided into a container flange and a pipe flange. According to the structure type, there are integral flanges, looper flanges, and threaded flanges. Common integral flanges include flat welding flanges and butt welding flanges. Flat welding flanges have poor rigidity and are suitable for occasions where the pressure is p≤4MPa; butt welding flanges, also known as high neck flanges, have higher rigidity and are suitable for occasions with high pressure and temperature. There are three types of flange sealing surfaces: flat sealing surface, suitable for occasions where the pressure is not high and the medium is non-toxic; concave-convex sealing surface, suitable for occasions with slightly higher pressure; tongue and groove sealing surface, suitable for flammable and explosive, toxic media and occasions with high pressure. A gasket is a ring made of a material that can produce plastic deformation and has a certain strength. Most of the gaskets are cut from non-metallic plates, or made by professional factories according to the specified size, and their materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc.; Metal-clad gaskets made of non-metallic materials such as wrapping; there is also a spiral wound gasket made of thin steel strips and asbestos strips. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120 °C; asbestos rubber gaskets are suitable for occasions where the temperature of water vapor is lower than 450 °C, the temperature of the oil is lower than 350 °C, and the pressure is lower than 5MPa. The most commonly used medium is the acid-resistant asbestos board. In high-pressure equipment and pipelines, lens-type or other-shaped metal gaskets made of copper, aluminum, 10-gauge steel, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is high.

Flanges are divided into threaded connection (wire connection) flanges, welding flanges, and ferrule flanges. The low-pressure small diameter has a wire flange and ferrule flange, and high pressure, and low-pressure large diameter use welded flange, the thickness of flanges and the diameter and number of connecting bolts are different for different pressures.

Flange connection

Flange connection is to fix two pipes, pipe fittings, or equipment on a flange first, add flange pads between the two flanges and fasten them together with bolts to complete the connection. Some pipe fittings and equipment already have their own flanges, which are also flanged connections. Flange connection is an important connection method in pipeline construction.

The flange connection is easy to use and can withstand greater pressure. In industrial pipelines, flange connections are widely used. In the home, the pipe diameter is small, it is low pressure, and the flange connection is not visible. If you are in a boiler room or production site, there are flanged pipes and equipment everywhere.

Connecting parts of Flange fitting

It consists of a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the surface of the gasket will deform when it reaches a certain value, and fill the unevenness on the sealing surface to make the connection tight and leak-proof. A flange connection is a detachable connection. According to the connected parts, it can be divided into a container flange and a pipe flange