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If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of

D/2 or minimum 2" to 5D.
D/5 or minimum 2" to 5D.
D/5 or minimum 2" to D.
none of these.

Correct Answer: D/5 or minimum 2" to 5D.

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