Confirmation of the B value in calculations
Thread Content
I would like to ask the teachers: In Figure 4, the value of B in the calculation sheet is 67.95. Based on the table in Figure 1, I estimate that the value of B is around 60–70. What does E=1.40E05 in the table represent? But how can one find the B-value from the data table in Figure 3’s B-value curve, given that the design temperature for the equipment’s inner cylinder is 105°C?
E=1.40E05 represents the E value of austenitic steel at 650 degrees. In Figure 3, use the B values corresponding to 1.05E-03 and 4.63E-04 in the 30-degree column to calculate the B value corresponding to your 0.00109; then use the B values corresponding to 2.00E-03 and 3.86E-04 in the 205-degree column to determine the B value for 0.00109 as well. Finally, calculate the B value for 105 degrees by finding the difference between the values obtained at 30 degrees and 205 degrees.
Teacher, may I ask: why are 1.05E-03 and 4.63E-04 used from the 30-degree column? If I take the corresponding B values for these two numbers, should I subtract one from the other (97.3 – 60.0 = 37.3)? How does this lead to a B value of 0.00109? ； Why are the B values corresponding to 2.00E-03 and 3.86E-04 in the 205-degree column used (76–46.4=29.6)? And is the B value for 105 degrees calculated by finding the difference between the values at 30 degrees and 205 degrees, resulting in (37.3+29.6=66.9)?
First of all, don’t call me teacher; I’m just here to help you. You can look up how to calculate differences online; it’s very simple. Once you understand what difference calculation is, you’ll know how to do it.
I still want to thank you for your generous help. Is it possible to add you on QQ?
You can add BlueSky moderator as a friend on Haichuan Forum. It facilitates communication. :lol