How to determine the variable diameter external pressure cylinder coefficient A and outer diameter Do?
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As shown in the figure, when determining the external pressure strain coefficient A of the external pressure cylinder, the table must be looked up based on the ratio of L/Do and Do/δe. So, for this type of variable diameter equipment, which Do should be used as the basis?
When the diameter is not large and the pressure is not high, use the large diameter. If you consider that the wall thickness may increase, use the external pressure tapered head segment calculation. If you still think it is too wasteful of material, use the 4732 design.
For equipment with variable diameter, the outer diameter Do refers to the maximum diameter of the cylinder after diameter reduction. When determining the external pressure strain coefficient A, the table should be looked up based on the maximum diameter Do after diameter reduction, and the ratio of L/Do and Do/δe should be calculated. .
For the equipment shown in the picture, when calculating the external pressure, each section is calculated separately, and the outer diameter and thickness of each section are taken. The length for calculating the external pressure is taken as L. The thickness of the cone shell cannot be less than the thickness of the connected cylinder.