How to choose the nominal pressure of the flange?

When selecting the nominal pressure of a flange, several factors need to be considered to ensure that it meets the actual needs and safety requirements of the piping system. Here are some key steps and considerations:

First, clear the working pressure of the pipeline system

First of all, it is necessary to define the working pressure range of the pipeline system. This is the basis for selecting the nominal pressure of the flange, because the nominal pressure of the flange should be slightly higher than the working pressure of the pipeline to ensure the safety of the pipeline system in extreme cases.

Second, consider the nature of the medium and the ambient temperature

In addition to the working pressure, it is also necessary to consider the nature of the medium of the pipeline (such as corrosion, toxicity, flammability and explosive, etc.) and the ambient temperature. These factors will affect the sealing performance and bearing capacity of the flange. For example, for corrosive media, it is necessary to choose the flange material and sealing surface type with better corrosion resistance; For high or low temperature environments, flange materials and structures that can adapt to these temperature changes need to be selected.

Third, check the flange standards and specifications

When selecting the nominal pressure of the flange, it is also necessary to consult the relevant flange standards and specifications. These standards and specifications usually provide detailed requirements on flange size, construction type, sealing surface type, material and nominal pressure. By reviewing these standards and specifications, you can ensure that the selected flange meets industry requirements and safety standards.

Fourth, determine the nominal pressure level of the flange

After considering the above factors, the nominal pressure level of the flange can be determined. Common nominal pressure grades include PN10, PN16, PN25, etc. (in MPa), as well as other values in psi. In the selection, the appropriate nominal pressure level should be selected according to the actual needs of the pipeline system. At the same time, it should also be noted that the nominal pressure of the selected flange should be matched with other components of the pipeline system (such as pipes, valves, etc.).

Fifth, consider special needs

In some special cases, such as extreme environments such as high pressure, high temperature, low temperature, strong corrosion, etc., it may be necessary to choose a special material flange or use a special sealing structure. At this time, the choice should be made according to the specific situation, and consult the advice of professionals.

Sixth, precautions

When selecting flanges, ensure that their nominal pressure meets the pressure requirements of the piping system and leave an appropriate margin to cope with possible pressure fluctuations.

The nominal pressure of the flange is closely related to the size of the flange, the structure type, the sealing surface type and other factors, so the comprehensive influence of these factors should be considered comprehensively in the selection.

In actual use, the flange should be checked and maintained regularly to ensure that its sealing performance and pressure capacity meet the requirements.

In summary, selecting the nominal pressure of the flange is a process that takes into account many factors. By clarifying the working pressure of the piping system, considering the properties of the medium and the ambient temperature, consulting the flange standards and specifications, determining the nominal pressure level of the flange, and considering special requirements, you can ensure that the selected flange meets the actual needs and safety requirements of the system.