Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?
Correct answer: C. Equal to
- A. Half
- B. Three fourth
- C. Equal to
- D. 1.5 times
Explanation
The tube sheet is normally made about equal in thickness to the tube outside diameter, subject to the stated minimum thickness of 22 mm. This provides enough strength for tube rolling, brazing, and pressure loading.
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