Backing Ring flange usually refers to flange with backing ring. Here is a brief introduction about it:
Structural features
Backing ring structure: flange with backing ring has an annular structure, namely backing ring, set on the back of flange body (the side opposite to the pipe connection surface). The backing ring is generally fixed to the flange body by welding or other connection methods. Its function is to enhance the structural strength and stability of the flange, especially when subjected to large pressure or bending moment, it can effectively disperse stress and prevent flange deformation or damage.
Connection method: Similar to ordinary flange, flange with backing ring is connected to pipeline or other equipment by bolt connection or welding. In the case of bolt connection, there are evenly distributed bolt holes on the flange, and the two flanges are tightly connected together by bolts and nuts; welding connection is to directly weld the flange to the end of the pipe to form a firm connection.
Material selection
Metal material: Commonly used materials are carbon steel, stainless steel, alloy steel, etc. Carbon steel backing ring flanges have high strength and good wear resistance, and are suitable for general industrial pipeline systems; stainless steel backing ring flanges have excellent corrosion resistance and are often used in chemical, food, medicine and other fields with high corrosion resistance requirements; alloy steel backing ring flanges can be added with different alloy elements according to specific performance requirements to obtain higher strength, heat resistance or other special properties.
Non-metallic materials: In some special occasions, such as when insulation, corrosion resistance or shock absorption are required, non-metallic materials such as polytetrafluoroethylene and fiberglass are also used to make backing ring flanges. These non-metallic materials have good chemical stability, insulation and shock absorption properties, but generally have relatively low strength and are suitable for some special working conditions with low pressure and strong corrosion.
Application fields
Petrochemical industry: In the process of petroleum refining and chemical production, backing ring flanges are often used to connect various pipelines and equipment, such as reactors, towers, heat exchangers, etc. Since petrochemical media are usually corrosive and have high pressure and high temperature characteristics, the high strength and good sealing performance of backing ring flanges can ensure the safe operation of the pipeline system.
Power industry: In the power production process such as thermal power generation and nuclear power generation, flanges with back rings are used to connect steam pipes, water supply pipes, etc. These pipes are subjected to high temperature and high pressure during operation. The back ring structure of flanges with back rings can effectively enhance the bearing capacity of flanges and ensure the reliability of the pipeline system.
Shipbuilding industry: Flanges with back rings are widely used in pipelines such as ship power systems, fuel systems, and seawater cooling systems. The ship piping system needs to withstand the influence of various factors such as vibration, impact, and seawater corrosion during the operation of the ship. The structural design and material selection of flanges with back rings can meet the special requirements of ship piping systems.
Other fields: In metallurgy, papermaking, pharmaceuticals, water treatment and other industries, flanges with back rings are also widely used to connect various types of pipes and equipment to meet the connection and sealing requirements under different working conditions.
