Are there double-pass floating-head heat exchangers?
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I received a customer’s drawing requesting the fabrication of a double-shell, floating-head heat exchanger. But looking at the pattern of 151, there is no similar legend. The original poster is not very knowledgeable; have any of you sea friends seen such heat exchangers before? Keywords: double shell and tube, floating head heat exchanger.
This is not easy to do. Add a longitudinal partition in the middle of the tube bundle? How to seal it? Prone to short circuits. The partition is welded in the middle of the shell, with a gap left in the middle of the tube bundle. How should the tube sheet of the floating head be constructed?
I haven’t done it before; it seems possible to do it, but the floating end isn’t fixed, so there’s a high likelihood of internal leakage and short circuits. The assembly requirements are quite high. Undoubtedly, the detachable structure of the partition connections also poses a risk of internal leakage.
The key issue is that the shell diameter is only 350, the heat exchange tubes are 6000 long; it’s very difficult to achieve proper sealing of the longitudinal partitions, resulting in significant internal leakage. It’s unclear what the advantage of using a double-pass design would be in this case.
If necessary, stack the two heat exchangers on top of each other.
Thank you! The owner originally provided us with two overlapping heat exchangers; if they are handled separately, then four heat exchangers will be needed.
I’ve never seen such a type of heat exchanger... Especially with a shell diameter of only 350, and heat exchange tubes that are 6000 long – it’s really difficult to achieve proper sealing for the longitudinal partitions.
The shell diameter is only 350, and the heat exchange tubes are 6000 long; it’s very difficult to seal the longitudinal partitions, resulting in significant internal leakage. Moreover, having a double-shell design serves little purpose as it is too difficult to manufacture.
I also suspect that the internal leakage in the shell side is too high, and there might be a dead zone at the bottom of the heat exchanger.
Two-pass is fine, but DN350 for two-pass. . . . . Is it to increase the flow rate?
Our company has worked on double-shell designs before, but not for something this small; the internal leakage is indeed quite severe