Should the material be selected using the external pressure coefficient B value?
Thread Content
Design a tower with a pressure of 0.42 Mpa, a design temperature of 360 degrees, using material Q345R; its diameter is 3800 and its height is 30,000. During calculation using SW6, the error \"The temperature value of the material’s external stress coefficient B in the calculation of allowable axial compressive stress exceeds the allowed limit\" occurred. How should this issue be addressed? Should the material be changed? However, the required stress can be found in GB150.2; why can’t the B value be obtained through the software?
The temperature is fine; the application curve for this B value is conditional. In a situation like yours, it indicates that there are issues with your A and B values, and it’s necessary to adjust the design pressure or other relevant parameters until everything is satisfactory. For more details, the original poster can refer carefully to the chapter on external and internal pressure strain coefficients in GB150.3-2011.
Positive pressure: not required; only external pressure has a strain coefficient.
Yes, but this problem is occurring now in the towers that use SW6 for calculating positive pressure. How can it be solved?
Yes, but this problem is occurring now in the towers that use SW6 for calculating positive pressure. How can it be solved?
No way, I’ve never encountered such a problem. It’s better to take a close look at and study the new standards as well as the precise definitions. :lol
Please upload the SW6 file so we can take a look~~
The GB150 standard does include a B value, but the developers of SW6 believe that the calculation of the B value above the creep temperature as specified in GB150 is incorrect; therefore, in the new version of SW6, the B value used for external pressure calculations is only applicable below the creep temperature. It is said that this is based on research findings from abroad; there is not yet much research on the B value above the creep temperature.
The GB150 standard does include a B value, but the developers of SW6 believe that the calculation of the B value above the creep temperature as specified in GB150 is incorrect; therefore, in the new version of SW6, the B value used for external pressure calculations is only applicable below the creep temperature. It is said that this is based on research findings from abroad; there is not yet much research on the B value above the creep temperature.