Heat Exchanger Applications M-3026

Page 17 of 32 tape 2 side 1 disk 3 i now recommend

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Tape 2 – Side 1 (Disk 3) I now recommend that you take a little time to look at the paperwork that came along with the tape, particularly the package of pages showing the different heads, shells, and tubing arrangements for heat exchangers, particularly shell and tube heat exchangers. These were provided to me a long time ago through the Patterson Kelly Company. This is one of the better assemblages of different types of connections that I’ve seen over the years and that’s why I have included it for your reference. At this point, I’d like to begin discussing some of the particulars of why the various components of the heat exchangers are designed and selected in certain ways. The principle components of a shell and tube heat exchanger consist of what is defined as a head on each end, the shell itself, and the tube bundle. The tube bundle is made up of the tubes and, usually, the baffles that direct the cross flow of the liquid flowing over the tubes. Of course, the heads sometimes have dividers in them in order to allow multiple passes through the exchanger. One of the key components to consider in the front head is the specifics of the direction of connection or entry of the fluids into the head. A very significant item is the idea of whether the fluid connection is directly in line with the heat exchanger or whether it comes in as side connections to the head component of the exchanger. It really doesn’t make any particular difference in the assembly or fabrication of the heat exchanger which type of connection is used. The side connections will possibly require a bit more metal and welding. The key factor to consider here is the idea of the convenience of installing, removing, and making the piping connections to the components, if the heads have to be removed periodically or if the exchanger needs to be moved periodically. In the case where it would need to be moved more regularly, the connections into and out of the sides of the head will make it much more convenient to work with the exchanger. Piping on each end usually forces you into a condition of having to drop the exchanger in a direct vertical condition in order to get it out of place, if it’s mounted horizontally. If for some reason it should be mounted vertically, it means then that the piping would either have to be dropped away from the top or bottom in order to allow the exchanger shell to move out of the way. When the connections are made to the sides of the head, that makes it very simple to remove an elbow or to spread the piping just a bit in order to allow easy removal of the head end. This allows for a fairly clear path for the removal of the shell with minimum disturbance to the piping and less overall operating maintenance and difficulties for the system.
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Christopher Reinemann
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