Stainless steel flanges are mainly made of two kinds of flat welding flange and butt welding flange, each with rings and rings. When flange dimensions are used to determine flange dimensions, the nominal diameter and nominal pressure of the flange must be known. The nominal diameter of the flange of the pressure vessel and the nominal diameter of the pressure vessel are taken in the same series.
The nominal pressure of the stainless steel flange is affected by the maximum operating pressure of the flange, the operating temperature and the stainless steel material used. Since the flange size series and flange thickness were calculated, the mechanical properties of 16MnR at 200 C were taken as the benchmark. Therefore, the size of the flange determined by this datum is specified. The maximum allowable operating pressure at 200 degrees is the nominal pressure of the flange.
For example, the nominal pressure is the flange of PNO.6MPa, which refers to a flange with such a specific size. The flange is produced by 16MnR. At 200 c, its maximum operating pressure is 0.6MPa. If the flange of the PN0.6MPa is used in an environment greater than 200 degrees, the maximum operating pressure will be lower than its nominal pressure 0.6MPa.
Conversely, if it is applied to less than 200 degrees, the highest working pressure will be determined at 200 degrees centigrade. If the flange material is changed to Q235-A, the mechanical properties of Q235-A stainless steel are less than 16MnR, and the nominal pressure PN0.6MPa flange is operated at 200 c, and its maximum operating pressure will be less than its nominal pressure. If the material of the flange is changed from 16MnR to 15MnVR, the mechanical performance of 15MnVR is better than that of 16MnR. The flange of the nominal pressure PN0.6MPa is operating at 200 degrees C, and its maximum operating pressure will be greater than its nominal pressure. In general, as long as the nominal diameter and nominal pressure of the stainless steel flange are determined, the size of the flange can be determined.
As for the maximum allowable operating pressure of the flange, it depends on the operating temperature of the flange and the type of stainless steel. Flange for standard pressure vessel flange is made of low carbon steel and low steel or stainless steel.
Source: China Stainless Steel Flanges Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)