Questions regarding the calculation of SW6 fixed tube sheets
Thread Content
Why is the calculation of the tube sheet in SW6 fixed-tube-sheet heat exchangers divided into before corrosion and after corrosion? Just calculate it directly after corrosion, isn’t that enough?
Tubesheets and tubes of different thicknesses are subjected to different stresses; it’s not possible to ignore the possibility that they might fail once operation starts, even before corrosion takes effect.
It’s not the case that the thicker the tube sheet, the safer it is
Before corrosion and after corrosion, the rotational stiffness on the side of the tube sheet and shell differs, etc., which affects the values of the calculation coefficients
Thank you all. Is there any very official or comprehensive answer?
All of this is obtained from calculations and standard definitions in books; no one in the official authorities will answer questions like yours.
Thank you. Does that mean that both before corrosion and after corrosion, there are the most dangerous operating conditions, so calculations need to be done for both?
Are there explanations on this in the sw6 training course materials?
I found the reasons mentioned by Teacher Qin Shujing in the SW6 course materials, but I don’t quite understand what they mean. Could some expert explain roughly why the stress mentioned there is so high?
I’m not very familiar with heat exchangers. Literally speaking, before corrosion occurs, the dimensions of components such as the tube sheet are larger than after corrosion; as a result, uneven deformation or displacement loads become greater. Such uneven deformation or displacement stresses generate additional stress. After corrosion, the tube sheet becomes thinner, and the stresses caused by pressure or external loads are higher than before corrosion, which is easy to understand