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Carbon steel flanges are different from flanges that are not produced according to standard sizes, also known as second-standard flanges. Usually, some unscrupulous merchants will reduce the thickness of the flange and the outer diameter to achieve the purpose of saving materials. Steel or leftover steel is used to process flanges. Usually, this kind of steel is a waste that does not meet the chemical composition and mechanical properties. What is more, the flange is produced by private steelmaking in black steel factories. The steelmaking technology used in this kind of private steelmaking is outdated. The method is to ensure mechanical properties and welding performance. It may not be welded to the steel pipe during use, or the steel itself has cracks, pores, etc., and it will leak after welding.
The butt welding flange is a kind of pipe fitting, which refers to a flange with a neck and a round pipe transition, which is connected to the pipe by butt welding. It is not easy to deform, has good sealing, and is widely used. It is suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines.
The advantage is that the price is relatively cheap, and the nominal pressure does not exceed 2.5MPa; On the pipeline of the flammable and explosive medium, the nominal pressure is about PN16MPa. Therefore, try to use carbon steel flanges when purchasing flanges.
Carbon steel flanges are used in building valves of cathodically protected transmission and distribution pipelines and in buried pipe valve wells that require potential slicing isolation.
The neck flange is a part that is connected to each between the shaft and the shaft, and is used for the connection between the pipe ends; it is also useful for the flange on the inlet and outlet of the equipment and is used for the connection between two equipment, such as the flange of the reducer. When the water pump and valve are connected to the pipeline, some parts of this equipment are also made into corresponding flange shapes, also known as flange connections.
Segment isolation of the buried transmission and distribution pipeline network can clearly grasp the cathodic protection situation of each piece of pipe network; evaluate the cathodic protection slices, and deal with different cathodic protection situations; when the protection potential of adjacent slices is the same And when the protection potential requirements are met, the two sides of the insulating carbon steel flange can be connected by a span bar for unified protection; The slices that meet the protection potential requirements are specially treated until they meet the requirements, and then the slices will be operated continuously.
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