Installation method of stainless steel eccentric reducer at pump inlet

2024-02-09

Let’s briefly introduce the function of stainless steel reducers in stainless steel pipe fittings: used to change the size of the pipe diameter. Then changing the size of the pipe diameter at the inlet and outlet of the pump is mainly to reduce the flow rate of the medium in the pipe, and reduce the flow rate to reduce the friction when the medium flows in the pipe. Due to its special eccentric properties, stainless steel eccentric reducers have different installation methods under different installation conditions. The following is a brief introduction to several installation methods of stainless steel eccentric reducers.

文章图片.png

The stainless steel eccentric reducer at the inlet of the centrifugal pump is generally installed with the top flat. However, when the stainless steel eccentric reducer is directly connected to an upwardly bent elbow, the bottom flat installation can be selected.

The reason why the stainless steel eccentric reducer is installed flat on the top is to prevent gas from accumulating in the eccentric reducer and entering the centrifugal pump, causing cavitation damage to the pump.

Regarding the installation of the stainless steel eccentric reducer on the inlet pipe of the end-suction centrifugal pump (that is, the pump inlet is a horizontal inlet), in the textbook on pump piping standards, it is stipulated as follows: The diameter orientation of the eccentric reducer on the horizontal pipe (Whether the horizontal part is upward or downward) is determined by whether a liquid bag or air bag appears (divided into two situations):

1. When the medium enters the pump from top to bottom, the eccentric reducer is installed with a flat bottom to prevent the occurrence of liquid bags;

2. When the medium enters the pump from bottom to top, the eccentric reducer is installed with the top flat to prevent the occurrence of air bags;

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.