The jacketed vessel has pipe openings running through the jacket and the inner cylinder
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In this diagram, the N1 port passes through both the jacket and the inner cylinder; for the welds where the inner cylinder part is connected within the box, an external pressure calculation is required. How should such a calculation be carried out? Also, is this structure acceptable, or would it be better to design it in a way similar to a flanged design, or add a straight pipe so that it can only bear internal pressure? I’d appreciate some advice! ! ! !
In the case of an N1 port in a jacketed vessel that penetrates through both the jacket and the inner cylinder, if external pressure calculations are required at the connection part of the inner cylinder, factors such as the thickness of the cylinder wall, the material grade, and the applied pressure usually need to be taken into consideration. Calculations can be carried out using pressure vessel design standards such as ASME or GB150. This structure is feasible, but it is necessary to ensure that the calculated structure can safely withstand external pressures. To further improve the stability and safety of the structure, designs such as flanging or adding straight pipes solely to withstand internal pressure are recommended. This can effectively reduce the risk of deformation or damage caused by external pressures. You can choose the most suitable design based on the actual working conditions and safety requirements. .
Do the process well. If full penetration of the weld is required, it must be ensured that the manufacturing process meets the specifications. In the event of an internal leak, this structure cannot ensure timely detection and repair; therefore, the medium should be non-toxic and non-explosive. Looking at its structure, it’s a filter; the medium used must be toxic, right?
If, in actual operation, there is no pressure in the inner cylinder while there is pressure in the jacket, only the strength calculations for the connections on the inner cylinder and those for the connections on the jacket need to be performed. Extreme external pressure conditions may occur. The technical requirements specify that a situation where the internal pressure is 0 and the external pressure is higher than 0.02 MPa must not occur, in order to avoid unnecessary calculations.
Yes, the medium is p-xylene; that’s correct. It is this structure that makes welding N1 to the inner cylinder difficult; welding can only be done from the inside, while welding the outer jacket to N1 requires beveling on the outside
It is better not to use this structure in xylene media, as there are serious safety issues in the event of a leak, and such leaks are also very difficult to detect.
It’s better not to use this structure with xylene as the medium, as there is a high risk of leakage at the fillet welds at the pipe ends, and such leaks are very difficult to detect.
So, regarding the addition of a sleeve type, GB150 does not specify the inner diameter d1 of the sleeve. How should this inner diameter be determined? (The current N1 fitting has an inner diameter of 325.)
1. Greater than the effective width of the reinforcement zone； 2. Meet welding requirements and be suitable for construction ； 3. Casing strength: Structure similar to honeycomb short tube (HG20569); welding shall comply with GB150.
It’s not possible; it’s better to use an external jacket with flanges or connections. This weld is prone to stress concentration. This structure is not available in GB150.
Can the external coil structure not meet the process requirements?