Questions about heat exchanger end caps
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A couple of days ago I visited a heat exchanger manufacturing plant, and in the workshop I saw a heat exchanger whose tube box and head were being welded; they looked rather odd. The thickness of the tube box’s end plates was 14 mm, while the thickness of the tube box head was only 8 mm. I took a look at their drawings, and that’s how it was designed. The pressure applied to this heat exchanger isn’t very high either – it seems the design pressure is only in the range of a few dozen kilograms. Isn’t that unreasonable? I’m not sure why it was designed this way.
What you’re referring to is probably a partition; it needs to be thick, otherwise it will deform when subjected to the force of the medium.
What was said upstairs is incorrect; it’s not a partition. It is necessary to check the temperature and pressure of the tube sheet. Generally, the calculated thickness of the head is thinner than that of the cylinder, so the above situation is not surprising. But it’s indeed much worse.
Another point is whether it refers to the minimum thickness of the butt tube required for the flange connection of the equipment.
There’s something wrong with this design. He should be making a transition on a short section, and that transition edge is quite long. This reduces the strength at the short sections. It has to be said that this organization really knows how to save money! ! I’m not sure if they will weld up that transition edge. Here, I usually make the end caps and tube sections the same thickness.
It seems that the 4th floor is more likely.
In general, it is likely due to the requirements of the equipment flanges; if they are JB/T4702 flanges, the tube sections are also quite thick. In the case of butt-welded flanges, then that is the minimum thickness requirement specified for such flanges
Reply to 5# penryn: It seems that they used less material, or they had such materials available at home, so they designed it in that way. I’ve seen the drawings; this equipment was designed and manufactured by their own company.
There are requirements regarding the thickness of the tube box; or flanges of type 4702 can be used in the design
To summarize: 1. The thickness of the shell segments required for the equipment flanges. 2. Design according to the minimum thickness specified by standards for the shell. 3. Custom design using available stock materials. 4. Large openings may be present on the shell segments; these segments need to be thickened to provide overall reinforcement, especially when there is high load on the pipe ends. . . . . . Continue to add downstairs
This design is quite normal. The pipe connections in the tube box have specific requirements regarding the wall thickness of the splices. For cylindrical thin-walled containers, the circumferential stress is approximately twice that of the radial stress; whereas the stress on spherical end caps is lower than the circumferential stress on the cylinder body, so it’s normal for their walls to be thinner.