2. A steel pipe 1.5m in diameter is required to carry an internal pressure of 750kPa. If the allowable tensile stress of steel is 140 MPa, determine the required thickness of the pipe in mm.

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Extracted text: 2. A steel pipe 1.5m in diameter is required to carry an internal pressure of 750kPa. If the allowable tensile stress of steel is 140 MPa, determine the required thickness of the pipe in mm.