When the pump is connected to the pipeline, we usually use flanges, unions or hoses for connection. For applications in medium and large pumps, we often use flanges as the main connection method. Flanges refer to disc-shaped parts used to connect pipes, containers or to fix shafts. They usually have screws and thread structures to fix them. They are generally used in pairs and are second only to welding. The second commonly used connection method,the typical connection method is a combination of flanges, gaskets and screws. Gaskets are added to the two flanges and tightly fixed with screws. Widely used in chemical industry, petrochemical industry, fire protection, drainage and other industries.
There are countless types of flanges. Commonly used materials include carbon steel, stainless steel, alloy steel, etc. In addition, its thickness, number of screw holes, aperture, etc., all need to be selected according to the operating requirements. The flange of appropriate specifications and sizes.
Common types of flanges can be divided into sliding flanges (also known as neck flat welding flanges) (SO), butt welding flanges (WN), threaded flanges (THDF), and loose sleeves according to their shapes and welding methods. Flange (LJ), socket weld flange (SW), blind flange (BL), and other special types. The following is a basic introduction to several main flange types.
Slip On Flange
A fairly common type that is less expensive to install and requires less precise pipe cutting. Stretch the steel pipe, pipe fitting, etc. into the flange hole and connect it to the pipe through the fillet welds at the top and bottom of the flange. Since the flange hole is larger than the pipe diameter, it usually requires more welding action than other flanges, so it can effectively prevent leakage. Compared with butt welding flanges, due to the lower neck height, they are only suitable for low and medium pressure applications.
Weld Neck Flange
The installation cost of flanges connected by butt welding to pipelines is relatively high. Contrary to the neck flat welding flange, the distance between the welding port and the joint surface is large, and the joint surface will not be deformed by the welding temperature. The butt welding flange is not easily deformed and has high sealing properties, making it suitable for high temperature and high pressure, even pipelines transporting flammable and toxic fluids.
Threaded Flange
The inner hole of the flange is processed into a pipe thread and connected to the threaded pipe. It is a non-welded flange. The main features are easy installation, disassembly and maintenance. However, considering the structural characteristics of the thread, it is strongly affected by the environment. The temperature inside the threaded pipe fluctuates greatly, so it is not suitable for high temperature and high pressure applications. The inner hole of the flange is processed into a pipe thread and connected to the threaded pipe. It is a non-welded flange. The main features are easy installation, disassembly and maintenance. However, considering the structural characteristics of the thread, it is strongly affected by the environment. The temperature inside the threaded pipe fluctuates greatly, so it is not suitable for high temperature and high pressure applications.
Lap Joint Flange
It consists of two parts, the Stub End and the Backing Flange. The flange is placed on the short neck, and the short neck is welded to the pipe end joint. The flange can move on the pipe end joint. It is mainly used for pipeline systems that must be frequently disassembled for inspection and maintenance. The flange of the short neck is the sealing surface, and the function of the flange is to clamp the pipe end and the short neck. Since the flanged short neck can isolate the loose flange from the medium, it is suitable for transporting highly corrosive fluids. It consists of two parts, the Stub End and the Backing Flange. The flange is placed on the short neck, and the short neck is welded to the pipe end joint. The flange can move on the pipe end joint. It is mainly used for pipeline systems that must be frequently disassembled for inspection and maintenance. The flange of the short neck is the sealing surface, and the function of the flange is to clamp the pipe end and the short neck. Since the flanged short neck can isolate the loose flange from the medium, it is suitable for transporting highly corrosive fluids.
Socket Weld Flange
The internal bore of the flange has a socket, and the pipe is connected by inserting the pipe into the socket and making a fillet weld around the top. Usually used for smaller size and high pressure pipes, but not suitable for applications with highly corrosive fluids. The internal bore of the flange has a socket, and the pipe is connected by inserting the pipe into the socket and making a fillet weld around the top. Usually used for smaller size and high pressure pipes, but not suitable for applications with highly corrosive fluids.
Blind Flange
A flange without a hole in the middle, used to seal the end of a pipe, with mounting holes around it, and a gasket sealing ring on the joint surface. The function is the same as the head and pipe cap, and the blind flange is fixed with screws for easy disassembly.
PTCXPUMP acid and alkali resistant sealless magnetic pump provides standard flange specifications (ANSI, JIS, DIN), adopts a three-piece movable flange design, and the screw hole position can be adjusted during piping installation, to avoid leakage at the entrance and exit.
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