Do overlapping heat exchangers have to be stacked together for heat treatment?
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Do overlapping heat exchangers have to be stacked together for heat treatment? Can it be done separately?
The overlapping heat exchangers are connected by fasteners, allowing them to be heat-treated separately.
It’s completely possible, but overall heat treatment of the heat exchanger is relatively rare. Heat treatment is usually applied to the tube sheet, but can the heat exchange tubes also be treated together? If it’s expanded, it definitely won’t work.
Yes, it’s the first time I’ve heard of overall heat treatment for heat exchangers. Additionally, what are the reasons behind carrying out overall heat treatment on overlapping heat exchangers? Are there processing stresses between overlapping heat exchangers? If it is heat-treated as a whole, does that mean it also needs to be transported and installed as a whole?
It depends on the size of the equipment; for smaller devices, it’s possible to carry out heat treatment on two of them together, while for larger devices, heat treatment can be performed separately.
It should be possible to handle them separately; there seems to be nothing wrong with treating them individually through heat treatment – just my personal opinion! Hehe
Hehe, overlapping heat treatment should be prohibited. 1: The local stresses generated by connection heat treatment can lead to local cracks. 2: Bolts and nuts cannot be heat-treated; what should be done if there is overlap?
Heat treatment is used to eliminate internal stresses, not external ones. Also, if there is overlapping, as someone mentioned earlier, fasteners cannot be heat-treated; doing so would have the opposite effect. That’s just my personal opinion
Overlapped heat exchangers do not need to be overlapped together for heat treatment. However, I would like to remind you whether the entire unit needs to undergo heat treatment or only the tube box. It is sufficient to overlap the heat exchangers before applying hydraulic pressure.
Heat exchangers are generally not subjected to full-scale heat treatment; instead, heat treatment is usually applied to the tube sheet or the shell side cylinder, and local heat treatment is carried out after welding the shell side cylinder to the tube sheet. If it has to be done, there’s no need to connect them together; however, they should be connected when testing water pressure