What is the process flow of stainless steel elbows?

2024-09-19

a. What is the process flow of stainless steel elbows?

Stainless steel elbows are a kind of pipe fittings used at the bends of pipelines. Among all the pipe fittings used in the pipeline system, it accounts for a large proportion, about 80%. Usually, different forming processes are selected for stainless steel elbows of different materials or wall thicknesses. At present, the commonly used seamless stainless steel elbow forming processes in manufacturers include hot pushing, stamping, extrusion, etc.

The process flow of stainless steel elbow production, if you make a long radius stainless steel elbow, you must first select the specifications and propose the pipe material. The expansion rate, through theoretical calculation, the general expansion rate is between 33% and 35%, and it is reversed. The general expansion rate of the short radius of 219mm is 50%. After selecting the raw materials, cut the materials according to the specifications of the stainless steel elbow, and then consider the radius of curvature. For example, a 90° stainless steel elbow, its curvature can be used to calculate how long the material can be used to process a 90° stainless steel elbow. It can be calculated through theoretical calculation, and then cut with this length as the fixed length. The material is hot pushed. Everyone may have seen the pusher, which is actually very simple. It is a horn-shaped core head or core rod, which changes from thin to thick, and the pusher process is a process of expanding the diameter with bending.

b. What are the technical requirements for stainless steel pipe fittings?

In order to improve the welding quality, the ends are all beveled, leaving a certain angle and a certain edge. This requirement is also relatively strict. The thickness of the edge, the angle and the deviation range are all specified. The geometric dimensions have many more items than pipe fittings. The surface quality and mechanical properties are basically the same as those of pipes. For the convenience of welding, the steel type is the same as that of the connected pipe.

All stainless steel pipe fittings must undergo surface treatment, and the iron oxide on the inner and outer surfaces is sprayed off by shot peening, and then coated with anti-corrosion paint.

1. The center positions of the two ends are different

The center points of the two ends of the stainless steel eccentric reducer are not on the same axis.

The center points of the two ends of the stainless steel concentric reducer are on the same axis.

2. Different operating environments

One side of the stainless steel eccentric reducer is flat. This design facilitates exhaust or liquid drainage and facilitates maintenance. Therefore, it is generally used for horizontal liquid pipelines.

The center of the stainless steel concentric reducer is on a line, which is conducive to fluid flow and has less interference with the flow pattern of the fluid during diameter reduction. Therefore, it is generally used for diameter reduction of gas or vertical liquid pipelines.

3. Different installation methods

Stainless steel eccentric reducers are characterized by simple structure, easy manufacturing and use, and can meet a variety of pipeline connection needs. Its application scenarios mainly include:

Horizontal pipe connection: Since the center points of the two ends of the stainless steel eccentric reducer are not on the same horizontal line, it is suitable for the connection of horizontal pipes, especially when the pipe diameter needs to be changed.

Pump inlet and regulating valve installation: The top flat installation and bottom flat installation of the stainless steel eccentric reducer are suitable for the installation of the pump inlet and regulating valve respectively, which is beneficial to exhaust and discharge.

Stainless steel concentric reducers are characterized by less interference to fluid flow and are suitable for reducing the diameter of gas or vertical liquid pipelines. Its application scenarios mainly include:

Gas or vertical liquid pipeline connection: Since the center of the two ends of the stainless steel concentric reducer is on the same axis, it is suitable for the connection of gas or vertical liquid pipelines, especially where diameter reduction is required.

Ensure the stability of fluid flow: The stainless steel concentric reducer has little interference with the fluid flow pattern during the diameter reduction process and can ensure the stability of the fluid flow.

4. Selection of eccentric reducers and concentric reducers in practical applications

In actual applications, appropriate reducers should be selected according to the specific conditions and needs of pipeline connections. If you need to connect horizontal pipes and change the pipe diameter, choose stainless steel eccentric reducers; if you need to connect gas or vertical liquid pipes and change the diameter, choose stainless steel concentric reducers.