Type U indicates the tubes are in a U-shaped bundle and no special closure is needed for the rear end, other than the shell itself. Types P and W are floating heads where the movement of the head effects the seal between either the shell-side or tube-side fluid and atmosphere.
Tema type exchangers free#
The floating head floats free inside the pressure vessel as the tubes move. The pressure seal is at the fixed shell joint in the outer head, which contains the pressure. As they expand, the floating head moves back and forth, but the pressure seal is not at the sliding joint. Many of the rear end types allow the head to “float” as the tube bundle expands and contracts. Gas that flashes from the liquid can exit the top nozzle. The weir controls the liquid, making sure the tubes are always immersed in liquid. Kettle types are common where there is a boiling liquid or where gas is liberated from shell fluid as it is heated. K is a kettle type reboiler, which is a special type and is best explained by looking at the example “AKT” in Figure 3-9. The fluid comes in and goes both ways around the longitudinal baffle and then exits. F is a two-pass shell with a longitudinal plate in it. The fluid comes in on one side and goes out the other side. The shell types are E, F, G, H, J, and K. In type C, the head cannot be unbolted for maintenance. If there were no removable cover on the front end of the exchanger, it would be designated “BBS.” The second nozzle and pass partition in the front end are discretionary depending upon the shell type. The head can move back and forth as the tubesheet expands and contracts.
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The rear of the heat exchanger is an internal floating head. The shell fluid comes in one end and goes out the other. The cover can be unbolted to perform maintenance and the channel can be unbolted without pulling the tube sheet.
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The first letter designates the front end of the heat exchanger, the second letter designates the shell type, or the middle of the heat exchanger, and the third letter designates the back, or the rear, of the heat exchanger.Īn AES classification for a heat exchanger means that the heat exchanger has a channel and removable cover type front end. Theseare best understood in conjunction with the example configurations given in Figures 3-7 through 3-9. Figure 3-6 is a list of TEMA standard classifications for heat exchangers, which helps to describe the various options. There are many different arrangements of the shells, tubes and baffles in heat exchangers.