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Show You the Classification Of Elbows

Apr. 27, 2020

We all know that the direction of the pipeline is generally controlled by elbows. So what are the categories of elbows? Elbow fitting supplier shows you the classification of elbows.

The elbow is a commonly used connecting pipe in water heater installation. It is used to connect and change the direction of the pipe at the end of the pipe.

Name 90 ° elbow, right-angle elbow, love bend, stamped elbow, stamped elbow, mechanical elbow, welded elbow, etc.

Uses: Connect two pipes with the same or different nominal diameter to make the pipes turn 90 °, 45 °, 180 °, and different angles.

Elbows less than or equal to 1.5 times the pipe diameter are elbows, and elbows greater than 1.5 times the pipe diameter are elbows.

In our daily life, we usually see elbow pipes with 90 45 and 180 degrees. In fact, there are elbows with special angles, but there are very few. Malleable cast iron pipe fittings are mainly used for heating, water and gas pipes, and pipelines.

Pressed elbows, also known as seamless elbows, are made of high-quality carbon steel, stainless acid-resistant steel, and low-alloy steel seamless steel tubes, etc., and are molded in special molds. Generally, it is manufactured by professional equipment manufacturers or processing plants using standard steel pipes through stamping production processing. At the time of delivery, the ends of the elbows should be processed with grooves.

Bending radius and one and a half times the nominal diameter (R = 1.5DN), it can also be used on special occasions with a bending radius equal to the nominal diameter of the elbow (R = 1DN). The range is consistent with the wall thickness of seamless steel tubes.

Seamless Elbow

Seamless Elbow

The Welded elbow is to punch the plate into a half-ring elbow through the die, and then weld the two half-rings together to form.

With a seamless pipe elbow, the bending radius is 200mm or more in the nominal diameter size range.

There are two methods for making elbows:

One is to cut the roll welded behind the majority of the roll tube support plates in the steel plate used for the material.

The other is to use pipe materials for cutting, formed by group welding technology, and its specifications are generally above 200mm. The ambient temperature cannot be higher than 200 ℃, and the general enterprise can make it on-site by the construction personnel. Elbow high pressure, high-quality low carbon steel, or forged alloy steel.

According to the connection structure of different pipelines, the ends of the elbow are processed into threads or grooves, and the precision of the processing is very high. It is required that the thread of the mouth and the thread of the flange can be closely related. The supporting enterprise can freely screw in and must not loosen. Petrochemical conduits for pressures of 22.0, 32.0 MPa, and common specifications ranging from DN 6 to 200 mm.

Technical requirements for elbow production:

It is required to control the radius of curvature. For example, if the radius length is 1.5D, the radius of curvature must be within the required tolerance range. Because most of these pipes are used for welding, in order to improve the welding quality, the end is inclined, with a certain angle and a certain edge, which is also relatively strict. It specifies the number of sides, angles, and deviation ranges, as well as more geometric figures than the thickness of the pipe. The surface quality and mechanical properties of the bent pipe are basically the same as those of the pipe. To facilitate welding, the steel of the connecting pipe should be the same.