Question 35 on the first day of 2010, at 3 p.m.: Pipe model
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35. In pipeline design, the pipe schedule number Sch is often used to indicate the wall thickness of the steel pipe. Below are the temperature-permissible pressure data for pipes made of austenitic stainless steel: Temperature, °C: ≤20, 100, 150, 200, 250, 300, 350, 400; Permissible pressure, Mpa: 137, 137, 137, 130, 122, 114, 111, 107. If pipes made from this material are to be used with a design temperature of 180°C and a design pressure of 1.2 Mpa, which pipe specification should be selected? A. Sch40s B. Sch20s C. Sch10s D. Sch5s I have no idea at all. I don’t know where this question comes from; I earnestly ask those who are more knowledgeable to give me some guidance! Thank you so much!
Page 629 of the association’s textbook: sch = P (design pressure) / allowable pressure; use interpolation to determine the allowable pressure at 180°C, and then perform the calculation.
This is the scope of the engineering design standards and specifications.
If you bring question 20553, it will be simple
The interpolation value is 132.8 MPa; SCH = 1.2/132.8*1000 = 9.04, so choose C