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Q. |
In a central heating system, the seamless copper tubing used has an inside diameter of 20 mm and a wall thickness of 0.6 mm. For a maximum pressure of 1750 Kpa, when allowable stress is 225 Mpa, the safety factor will be |
A. | 7.7 |
B. | 9.9 |
C. | 3.3 |
D. | 5.5 |
E. | Increasing the diameter of threaded portion |
Answer» A. 7.7 |
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