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32 Applied Process Design for Chemical and Petrochemical Plants

Figure 10-22A. Construction details of two-pass expanding shell-side baffle. (Used by permission: Struthers-Wells Corp., Bul. A–22.)

Table 10-7
Tie Rod Standards
(All Dimensions in In.)

Nominal Tie Rod Minimum Number
Shell Diameter Diameter of Tie Rods

6—15 3 / 8 4
16—27 3 / 8 6
28—33 1 / 2 6
34—48 1 / 2 8
49—60 1 / 2 10
Used by permission: Standards of Tubular Exchanger Manufacturers Association,
th
7 Ed., Table R 4 71, © 1988. Tubular Exchanger Manufacturers Association,
Figure 10-22B. Assembled two-pass shell baffle for installation in Inc. All rights reserved.
shell of exchanger. (Used by permission: Struthers-Wells Corp. Bul.
A–22.).

7. Tubesheets side or vice versa would present a serious problem, the dou-
ble tubesheet is used as shown in Figure 10-23. This is con-
Tubesheets form the end barriers to separate the shell- siderably more expensive for fabrication, not only due to the
side and tube-side fluids. Most exchangers use single plates plate costs, but also to the extra grooving of these sheets and
for tubesheets. However, for hazardous or corrosive materi- rolling of the tubes into them. Because they must be aligned
als such as chlorine, hydrogen chloride, sulfur dioxide, etc., true, the machining must be carefully handled; otherwise
where the intermixing due to leakage from shell- to tube- assembly of the unit will be troublesome.