Welding as a connection method is widely used in various industries. There are a wide variety of parts for welded connections, among which elbows, as an important part of the piping system, are often used to change the direction of fluid flow and play a connecting role. Elbows are divided into two types: butt-weld elbows and straight-seam elbows. Next, we will discuss in detail the differences between these two types of elbows.
1. Manufacturing process is different
The manufacturing process of butt-weld elbow is to insert the end of the elbow straight into the pipe and butt-weld it with the pipe. The manufacturing process of straight elbow is a straight pipe through the bender in accordance with the specified bending angle bent into an elbow.
The manufacturing process of butt-welding elbow has very high requirements for the welding process and requires close process control. The production process of straight seam elbow is relatively simple and easy to operate.
2. Different scope of application
Butt-welding elbow is usually applied to high-pressure, high-temperature pipeline systems, such as nuclear power plants, petrochemical industries, its thickness and size have certain specifications, so as to ensure its welding process and quality. And straight seam elbow is usually suitable for low pressure, low temperature pipeline system, such as water, ordinary gas and other industries, its installation structure is simple and inexpensive.
3. Reduce resistance and flow resistance different
The structural design of butt-weld elbow, especially the ratio of its bending angle and radius (D: R), often designed to 1.5 or 2.0, makes the pneumatic noise generated when passing through the pipeline fluid is reduced, resistance is small, easy to maintain, and does not affect the movement of the fluid.
While the structural design of straight elbow is relatively simple, its D: R ratio is below 1.5, which will produce great flow resistance and fluctuations, and will disturb the state of the fluid in the pipeline, thus increasing its energy loss and reducing the overall flow of the pipeline.
When the actual application has a straight plate can not be well connected to the pipe, the use of butt-weld elbow is a better choice. For straight elbows, they can be used to form pipe turns in cases where the size of the parts is relatively small.
