Problems with stainless steel pressure vessel flanges?
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I have a question for everyone: the flanges of pressure vessels are available only with carbon steel, low-alloy steel, and stainless steel linings. If one wants to use a pressure vessel flange made entirely of stainless steel, can the standard dimensions for pressure vessel flanges be used directly as a reference? After all, for standard vessel flanges no calculations are required (and it’s impossible to carry out such calculations); instead, the calculation methods for pipe flanges specified in GB150 must be applied. It seems that using the calculation methods for pipe flanges for vessel flanges might not be appropriate either. I would like to ask everyone how to solve this problem?
Calculate it based on non-standard flanges; any type of flange can be selected
I usually perform the calculations by referring to standard flange dimensions.
Calculate using the structural dimensions of container flanges specified in NB/T 47021~23; if the calculations do not work, modify the corresponding dimensions. Since stainless steel is not the specified material for container flanges, calculations must be carried out and a calculation report provided; it cannot be selected directly. The flange type and pressure rating can be selected with reference to Q245R or 20 steel, as their allowable stress is close to that of stainless steel.
Calculate using the structural dimensions of container flanges specified in NB/T 47021~23; if the calculations do not work, modify the corresponding dimensions. Since stainless steel is not the specified material for container flanges, calculations must be carried out and a calculation report provided; it cannot be selected directly. The flange type and pressure rating can be selected with reference to Q245R or 20 steel, as their allowable stresses are close to those of stainless steel.