What is the nominal pressure of stainless steel flange
Today, the stainless steel flange manufacturer will explain to you what the nominal pressure of the flange is:
The nominal pressure of the flange is related to the maximum operating pressure, operating temperature and flange material of the flange. Because the mechanical properties of Q345R at 20 °C are used as the benchmark when formulating the flange size series and calculating the flange thickness, it is stipulated that the flange size determined by this benchmark will be the maximum at 20 °C. The allowable operating pressure is considered to be the nominal pressure of the flange with that size.
For example, a flange with a nominal pressure of PN0.6MPa refers to a flange with such a specific size. The flange is made of Q345R. At 20°C, its maximum allowable operating pressure is 0.6MPa. 6MPa。 If the PN0. 6MPa flange is used in a condition higher than 20 ℃, then its maximum operating pressure will be lower than its nominal pressure 0. 6MPa.
Conversely, if it is used under the condition of lower than 20℃, its maximum working pressure is still determined according to 20℃. If the material of the flange is changed to Q235A, then the mechanical properties of Q235A steel are much worse than that of Q345R. This flange with a nominal pressure of PN0.6MPa, even if it is operated at 20℃, its maximum allowable operating pressure will be lower than its nominal pressure.
On the contrary, if the material of the stainless steel flange is changed from Q345R to 14Cr1MoR, then, since the mechanical properties of 14Cr1MoR are better than that of Q345R, the maximum allowable operating pressure of this flange with a nominal pressure of PN0.6MPa will be higher when operating at 20°C. at its nominal pressure.
In short, the maximum operating pressure allowed by the flange depends on the operating temperature of the flange and what material it is made of. The flange materials specified in the pressure vessel flange standard are Q235R, Q245R, Q345R, etc. At different temperatures, the conversion relationship between their nominal pressure and the maximum allowable working pressure can be used to compare the operating temperature given in the design conditions with the design The pressure is converted into the nominal pressure required to obtain the flange standard.
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