Calculation of hole reinforcement for external pressure vessels
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This post was last edited by shinaijian on 2019-8-2 15:12 Design Pressure: inner cylinder: -0.1MPa, jacket: 0.44MPa. When calculating the reinforcement of the N1 pipe opening, SW6 is calculated based on -0.1. Do we need to add the internal pressure of the jacket, which is -0.54, to calculate?
I think we should add it, this is calculation pressure.
The designed external pressure of the inner cylinder should be -0.54MPa, so the opening reinforcement of the inner cylinder is also at this pressure, provided that the opening also bears the pressure of the jacket. If the opening does not bear the pressure of the jacket, then the reinforcement pressure of the opening is still -0.1MPa, and specific issues will be dealt with on a case-by-case basis.
I also think it should be added, but when calculating the head thickness of SW6, it is calculated as -0.54, but when calculating the NI pipe opening reinforcement, it is calculated as -0.1, which makes me very confused. . .
Nozzle N1 is the stirring hole, which only withstands the negative pressure of -0.1MPa and does not withstand the external pressure of the jacket. Therefore, it is correct to calculate the strength according to the negative pressure of -0.1MPa.
The main thing is to distinguish the difference between design pressure and calculated pressure. Strength calculation uses calculated pressure. When determining the calculated pressure, how to combine the design pressures of the inner and outer cylinders depends on the specific calculation part and whether it is subject to the pressure of the inner cylinder and the jacket at the same time.
Please note the difference between design pressure and calculated pressure.
This post was last edited by zjq1962 on 2019-8-3 12:59. Is the header you are talking about an upper header or a lower header? By default, the software has no jacket on the upper head.