A question regarding the verification criteria for the axial stress of the skirt of tower equipment
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Why is the load combination factor not multiplied in the axial stress verification conditions for the skirt of tower equipment during hydrostatic testing? Isn’t there a wind bending moment equal to 0.3 times the value involved in the calculation of axial stress? Isn’t the wind load also involved in the combination? Is it because 0.3 was multiplied in front? Is it required that the structure must be able to withstand 100% of 0.3 times the maximum wind bending moment during hydrotesting? Does it not matter the probability of that load occurring?
The load combination factor is related to the allowable stress, whereas the pressure test is determined using B or Rel; they are not the same thing
You haven’t understood the purpose of the hydrostatic test. . . I'm telling you, wind load and are two different things
In the checking formula for the lap weld between the skirt and the tower shell, isn’t a factor of K applied during the hydrostatic test?
Perhaps only one explanation makes sense: during the hydrostatic test, it is necessary to take into account a wind bending moment equal to 0.3 times the maximum value. This is not determined by probability but is a requirement for safety; whenever a hydrostatic test is conducted, the structure must be able to withstand such wind loads. In other words, even if there is strong wind, the hydrostatic test should still be carried out without any problem. If that is the case, K in the shear stress verification formula for the hydrostatic test of the skirt seat and tower shell lap welds should also be removed.
A voltage withstand test cannot be carried out during an earthquake, and it is possible to have wind during the test. So, wind loads are considered while seismic loads are not.
K in Formula 101 is not present. This has been modified.
I agree with what was said on floor 7: the formula 101 in the standards has been modified, so that the hydrostatic test verification does not take into account combination factors
Could you upload the errata sheet for NB/T47041-2014 Tower Containers? Thank you!
I haven’t seen an official correction list; I only heard about it from the instructor during the training...
Could you tell me how the teacher explained it during the training?