What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?
Correct answer: B. 6.5 mm
- A. 6.5 cms
- B. 6.5 mm
- C. Equal to tube I.D
- D. Equal to tube O.D
Explanation
The minimum ligament, or clear distance between adjacent tubes, in a square pitch layout is about 6.5 mm. It must be large enough for tube-sheet strength and fabrication, whereas 6.5 cm is excessive.
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