The difficulty in calculating external pressure at 500 degrees
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For towers, heat exchangers, etc., when the design temperature is 500 degrees, chromium-molybdenum steel can be used; its allowable stress as a material can be found in GB150.2. However, the external pressure curve values A and B for it can no longer be found in GB150.3; what should be done in this case regarding the allowable values A and B for the calculation of the tower’s skirt? Can only change the material? It was changed to stainless steel, but the yield stress of stainless steel at around 500 degrees is too low; this results in a very thick material. How does everyone solve this problem?
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According to GB150.3-2011, Table 4-1 specifies that the design temperature range for Cr-Mo steel is ≤475°C; therefore, it is necessary to change the material.
It was changed to stainless steel, but the yield stress of stainless steel at around 500 degrees is too low; as a result, the thickness required becomes very large!
Design a reinforcing ring to convert the long cylinder into a short cylinder.
Design a reinforcing ring to convert the long cylinder into a short cylinder.
High temperature means a lower allowable stress, that’s certain
After 475 degrees, the curve disappears. It’s not just a matter of low levels anymore.