A cast iron pipe of 1m diameter is required to withstand a 200m head of water. If the limiting tensile stress of the pipe material is 20MPa, then the thickness of the pipe will be
A
25mm
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B
50mm
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C
75mm
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D
100mm
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Solution
The correct option is B50mm Hoopstress=pd2t=20MPa p=200m head of water =200kPa=2MPa ∴t=2×120×2=0.05m=50mm