Forged flange is a commonly used connection device, and its pressure classification is mainly determined according to the working pressure and working temperature of the flange connection. The common forged flange pressure classification is as follows: PN6 (0.6MPa) : suitable for low pressure, low temperature working environment, such as water supply system. PN10 (1.0MPa) : Suitable for general industrial fields, including chemical, petroleum, pharmaceutical, etc. PN16 (1.6MPa) : suitable for the working environment under medium pressure conditions, with a wide range of applications. PN25 (2.5MPa) : Suitable for working environments under high pressure conditions, often used in pipeline systems to transport liquids or gases. PN40 (4.0MPa) : Suitable for working environments under higher pressure conditions, commonly found in high-pressure piping systems or special working conditions. The above is a common forged flange pressure grade classification, the actual use also needs to choose the appropriate pressure level according to the specific working conditions, medium properties and safety requirements. At the same time, when choosing forged flange, it is also necessary to consider its material, sealing form and size.
