Selection Guide of Pipe Flange

Choosing the right pipe flange requires considering factors such as pipe material, size and pressure. At the same time, attention should be paid to details during installation and maintenance to ensure the normal operation of the pipeline system.

Selection of pipe flange

1. Material selection

The material of the pipe flange needs to be selected according to the chemical composition and properties of the pipeline conveying medium. Currently, common materials include carbon steel, stainless steel, lead, copper, nitrile rubber, PVC, etc. For corrosive media, stainless steel flanges are generally selected; for high-temperature conveying media, flanges made of high-temperature alloys are generally selected.

2. Size selection

The size of the pipe flange needs to be selected according to the diameter of the pipeline. There are usually two types of standard sizes and non-standard sizes. Standard sizes are generally selected according to international standards or national standards, while non-standard sizes need to be produced and customized according to the actual size of the pipeline.

3. Pressure level selection

The pressure level of the pipe flange needs to be selected according to the pressure level of the pipeline system. Generally, the corresponding pressure level is selected according to the working pressure and temperature of the pipeline. The general pressure levels are PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.3, PN10, PN16, PN25, PN40, etc.

Installation of pipe flanges

1. Preparation before installation

Before installation, the flanges, gaskets, bolts, etc. need to be checked and cleaned to prevent debris and dust from affecting the installation quality. At the same time, it is necessary to check whether the pipe length, diameter and elbow meet the design requirements, and check whether the flange bolt hole position is correct.

2. Flange connection

Align the flange with the pipe installation, check whether the flange gap is uniform, and tighten the bolts using the diagonal method. When tightening the bolts, each bolt needs to be tightened alternately in circles, and be careful not to overtighten or over-loosen to avoid affecting the service life of the flange.

3. Pressure test

After installation, a pressure test is required to check the quality of the pipe flange connection. Generally, a water pressure test is used. The test pressure should be 1.5 times the maximum working pressure of the pipeline system, and the test time should be more than 10 minutes.

Maintenance of pipe flanges

1. Regular inspection

For pipe flanges, it is necessary to regularly check whether the fastening bolts of the flange connection are loose and whether the sealing gasket is aging. If any problems are found, they need to be replaced in time. In addition, it is also necessary to check whether the anti-corrosion layer of the pipeline is intact, and any damage needs to be repaired in time.

2. Pay attention to the pipeline medium

The nature and temperature of the pipeline medium will affect the service life of the flange. For pipelines with corrosive media, anti-corrosion treatment is required, and for high-temperature pipelines, high-temperature resistant materials need to be selected.

3. Avoid mechanical impact

During use, the pipe flange needs to avoid mechanical impact and excessive vibration, etc., to avoid damage and aging of the pipe flange.

Conclusion

Pipe flanges are an important connection method in the pipeline system. Understanding the factors that need to be considered in the selection of pipe flanges will help to select suitable pipe flanges from the products of flange supplier. At the same time, you should not relax after the purchase is completed. Correct installation and maintenance can extend the service life of the flange and ensure the normal operation of the pipeline system.