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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].	3.3	[B].	5.5
[C].	7.7	[D].	9.9

Answer: Option C

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