Longitudinal baffle seal

Figure 19.9 Detail illustrating how a modem longitudinal baffle seals up against the inside of the exchanger shell.

In spht-flow shells the longitudinal baffle may be installed without a positive seal at the edges if design conditions are not seriously affected by a hmited amount of bypassing. 

Figure 12.12. Shell types (pass arrangements), (a) One-pass shell (E shell), (b) Split flow (G shell), (c) Divided flow (J shell), (d) Two-pass shell with longitudinal baffle (F shell), (e) Double split flow (H shell), (f) Baffle sealing.

Figure 28.4 Detail showing portion of longitudinal cross baffle seal strips.

Sealing. strips. These longitudinal strips either extend from baffle to baffle or may be inserted in slots cut into the baffles. 

Two shell passes (F shell) are occasionally used where the shell and tube side temperature differences will be unsuitable for a single pass (see Section 12.6). However, it is difficult to obtain a satisfactory seal with a shell-side baffle and the same flow arrangement can be achieved by using two shells in series. One method of sealing the longitudinal shell-side baffle is shown in Figure 12.12/. 

The seal strips, as used in association with the longitudinal crossbaffle, are very thin, flexible strips of metal clamped to both long sides of the baffle, as shown in Figs. 28.4 and 28.5. 

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