In the piping system, elbow is to change the direction of the pipe fittings. According to the angle, there are 45°and 90°180°three most commonly used, in addition, according to engineering needs also include 60°and other non-normal angle elbow. Elbow materials are cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metals and plastics.
The way to connect with the pipe are: direct welding (the most common way) flange connection, hot fusion connection, electrofusion connection, threaded connection and socket connection. According to the production process can be divided into: welding elbow, stamping elbow, pushing elbow, casting elbow, butt welding elbow, etc. Other names: 90 degree elbow, right angle elbow, etc.

Technical requirements of the elbow

Requirement to control the radius of curvature. For example, if the radius length is 1.5D, then the radius of curvature must be within the required tolerance. As most of these pipe fittings for welding, in order to improve the quality of welding, the end are turned into a bevel, leaving a certain angle, with a certain edge, this one requirement is also more stringent, how thick the edge, the angle for how much and the range of deviation are specified, geometric dimensions than pipe fittings a lot more items. Elbow surface quality and mechanical properties are basically the same as the pipe. For the convenience of welding, and the steel of the tube being connected is to be the same material.
1.as most of the pipe fittings for welding, in order to improve the quality of welding, the end are turned into a bevel, leaving a certain angle, with a certain edge, this requirement is also more stringent, how thick the edge, the angle for how much and deviation range are specified. The surface quality and mechanical properties are basically the same as those of the pipe. For the convenience of welding, the steel type of pipe fittings and the connected pipe is the same.
2.is that all pipe fittings are subjected to surface treatment, the inner and outer surface of the iron oxide by shot blasting treatment sprayed off, and then coated with anti-corrosion paint. This is for export needs, in addition, in the country is also to facilitate transportation to prevent rust and oxidation, are to do this work.
3.is the requirement for packaging for small pipe fittings, such as exports, you need to do wooden boxes, about 1 cubic meters, the number of elbows in such boxes can not exceed about a ton, the standard allows sets, that is, large sets of small, but the total weight generally can not exceed 1 ton. For large pieces of y to be a single package, like 24″ must be a single package. Another is the packaging mark, the mark is to indicate the size, steel number, batch number, manufacturer's trademark, etc..

Types of elbow division

Divided by the production method can be divided into pushing, pressing, forging, casting, etc.
Divided by the manufacturing standard can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.
Divided by its radius of curvature: can be divided into long-radius elbow and short-radius elbow. Long-radius elbow refers to its radius of curvature is equal to 1.5 times the outer diameter of the pipe, that is, R = 1.5D; short-radius elbow refers to its radius of curvature is equal to the outer diameter of the pipe, that is, R = 1.0D. (D is the elbow diameter, R is the radius of curvature).
If divided by pressure level:There are about seventeen kinds, and the United States pipe standards are the same, there are:Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;Sch80, SCH100, Sch120, Sch140, Sch160 XXS; the two most commonly used are STD and XS.
According to the different shape use can be divided into: grooved elbow, tube elbow, double-bearing elbow, flange elbow, reducer elbow, dull seat elbow, inside and outside the tooth elbow, stamping elbow, push elbow, socket elbow, butt welding elbow, internal wire elbow, etc.

Cangzhou Shenlong Pipe Manufacturingis a professional manufacturer of all kinds of steel pipes and pipe fittings, with more than 30 years of experience in this field. It covers an area of more than 60,000 square meters, employs more than 200 people (including 30 inspectors), and has an annual production capacity of about 150,000 tons of steel pipes and 40,000 tons of pipe fittings. The production process is carried out in full accordance with the ISO9001 system, and the qualification rate is 100% for 5 years.If you are interested in elbows and other piping materials, please feel free to contact us.