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2. For an ASTM A106 GradeB pipe having a Nominal Diameter of 22inch, calculate the required wall thickness to withstand 200kPa external pressure assuming

2. For an ASTM A106 GradeB pipe having a Nominal Diameter of 22inch, calculate the required wall thickness to withstand 200kPa external pressure assuming there is no stiffener in the straight section of a pipe for over 100m length. The corrosion allowance for pipe is 3mm and the mill tolerance of 12.5% is to be considered. The design temperature is 200 degrees Celsius (40 Marks)

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