How to solve the issue of the external pressure coefficient B temperature being out of range when using SW6 to calculate towers?
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When using SW6 software to calculate the tower, it keeps indicating that the external pressure coefficient B is out of the acceptable range. The design temperature is 390 degrees – how can this issue be resolved?
It’s hard to say why. Increased thickness? Change the material?
The tower thickness is 17 mm, with a corrosion margin of 3 mm; the inner diameter is 2400, and the design temperature is 390 degrees
It seems there is no 17mm carbon steel plate available. It’s possible that there was an error in entering the information in a certain field, or the calculation was incorrect; thus the warnings given can sometimes be inaccurate.
What material is the main component? For Q345R material, the maximum operating temperature for thicknesses below 36 mm is 350°C; try using Q245R instead. For thicknesses between 16 and 36 mm, the maximum operating temperature is 425°C.
Is the temperature and thickness range you mentioned specified in any standard?
As specified in Table 2 of GB150.2-2011, SW6 is also a database created based on GB150.2
I would like to ask one more question: in Table 2 of 150.2, why is there no B value for Q345R with a thickness of less than 36 mm when it undergoes creep at temperatures above 350 degrees?