The minimum shell thickness for tank ≤ 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?
Correct answer: B. 5
- A. 2
- B. 5
- C. 10
- D. 15
Explanation
For tanks up to 15 m in diameter, the shell thickness is commonly kept at least 5 mm to prevent buckling or elastic instability, even when pressure calculations would permit a thinner wall. Therefore the limiting value is 5 mm.
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