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Stainless steel elbow introduction
Stainless steel elbow is used to change the direction of stainless steel piping fittings, in a variety of industrial piping systems and building water supply and drainage systems have a wide range of applications. The following is its detailed introduction:
Material
Commonly used stainless steel materials are 304, 316, 321, etc. 304 stainless steel has good corrosion resistance and oxidation resistance, suitable for general industrial and civil environments; 316 stainless steel due to the addition of molybdenum, stronger corrosion resistance, especially in the resistance to chloride corrosion excellence, commonly used in marine environments or in contact with chemical mediums; 321 stainless steel contains titanium, with good resistance to intergranular corrosion. Intercrystalline corrosion resistance, can maintain stable performance in high temperature environment.
Classification
According to the angle: common 45 ° elbow, 90 ° elbow, etc. 45 ° elbow is used for pipeline direction change smaller occasions, can make the pipeline to a small angle turn; 90 ° elbow is widely used in the need for right-angle turn in the pipeline system.
According to the radius: long radius elbow and short radius elbow. Long radius elbow bending radius is generally 1.5 times the nominal diameter, the fluid resistance is small, suitable for high fluid resistance requirements of the piping system; short radius elbow bending radius is usually 1 times the nominal diameter, occupying a small space, in the space is more suitable for limited occasions, but the fluid resistance is relatively large.
Manufacturing process
Push elbow: the use of special molds, stainless steel pipe billet into the mold, through the push of the push machine, so that the billet is gradually deformed in the mold to form the elbow. The elbow produced by this process has a smooth inner wall, uniform wall thickness, better quality, and is suitable for the manufacture of elbows of various specifications.
Pressed elbow: Stainless steel plate is cut into the desired shape, and then the plate is pressed into an elbow by stamping or pressing process. The pressed elbow has high dimensional accuracy and good appearance quality, but for the manufacture of large-diameter elbows, there may be uneven wall thickness.
Welded elbow: welded from a number of parts, usually first rolled or pressed stainless steel plate elbow parts, and then join them together by welding. The manufacturing process of welded elbow is relatively simple and low cost, but the quality of welding has an important impact on the performance of the elbow, which requires strict control of the welding process and quality.
Features
Strong corrosion resistance: stainless steel material itself has good corrosion resistance, can resist the erosion of various chemical media, not easy to rust and corrosion, can extend the service life of the piping system.
High strength: stainless steel has high strength and hardness, can withstand greater pressure and impact, to ensure the safe operation of the piping system.
Application field
Industrial field: It is widely used in the piping system of petroleum, chemical, electric power, metallurgy and other industries for conveying various corrosive media, high temperature and high pressure fluids. For example, in the petrochemical plant, stainless steel elbow can be used to connect the pipelines in different directions, so that the process can be carried out smoothly.
Food and pharmaceutical fields: due to its good hygiene performance, stainless steel elbow is widely used in food processing, beverage production, pharmaceutical manufacturing and other industries in the piping system, to ensure that the transported food and drugs are not contaminated.
Long radius elbow and short radius elbow have the following specific differences in application scenarios:
Space requirements
Long radius elbow: larger bending radius, generally 1.5 times the nominal diameter, occupying more space. Therefore, in the open space, the pipeline arrangement of space requirements are not high places, such as large industrial plants, outdoor pipeline corridors, etc., the long radius elbow is more suitable to make the pipeline more gentle and smooth.
Short radius elbow: bending radius of 1 times the nominal diameter, occupying a small space. In places with narrow space, such as pipeline wells inside buildings, ship's cabin, etc., the short radius elbow can be better adapted to the limited space, to facilitate the installation and layout of the pipeline.
Fluid resistance
Long radius elbow: It can make the stress distribution of the pipe at the bend more uniform and reduce the stress concentration phenomenon. For piping systems that transport high temperature and high pressure fluids, or occasions with high requirements for piping stress control, such as chemical piping, steam piping, etc., the long radius elbow helps reduce the risk of rupture or leakage of the pipeline due to excessive stress, and improve the safety and reliability of the piping system.
Short radius elbow: Due to the relatively large bending angle, the stress concentration at the pipe bend is relatively obvious under the same working conditions. Therefore, in piping systems subjected to high pressure, high temperature or high stress, if a short radius elbow is used, it is necessary to carry out stress analysis and design more carefully, or to take corresponding reinforcement measures to ensure the safe operation of pipelines. However, in some low-pressure, normal-temperature common piping systems, the stress problem of short radius elbows usually does not become a critical factor limiting their use.