Number of longitudinal welds on the cylinder body
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Does GB150 have any requirements regarding the number of longitudinal welds on the cylinder body? If there is no requirement, I use two or more longitudinal welds for the cylinder; I divide the cylinder into two halves, then align them and weld them together – two longitudinal welds in total
Refer to Section 15.4 of the manufacturing instructions: as long as the spacing requirements between welds are met, multiple rolls can be used (in the longitudinal direction – as indicated on 20583) and then joined together. It should also be reflected in your manufacturing process.
Why split it into two halves and then join them? The normal process should be to assemble the panels first and then roll them up.
Thank you for your reply. I couldn’t find it – could you please specify which one it is?
Well, I’ll answer any questions. I will discuss this in Volume 4, which is dedicated to providing general knowledge about pressure vessels. Question 25: Is the circumference of the pressure vessel drum aligned with the rolling direction of the sheet metal? Let me correct that – according to HG20584-6, the rolling direction mentioned in the processes of processing and shaping is the same as the rolling direction of the sheet metal. I can look it up in the book myself ； As for multiple welds, they are mentioned in GB150.4.
Brother X, is it because the roll former isn’t powerful enough? Are you planning to form the shapes first and then splice them together?
Thank you to the people who replied above. Without discussing why it is done this way, I just want to know if what I asked is feasible
There is a fixed-tube-sheet heat exchanger, and a section of the shell side tube section in the middle is damaged and needs to be replaced. What’s on my mind is whether it’s possible to divide the newly replaced tube section into two halves for direct replacement; this would result in multiple longitudinal welds. I’m not sure if the standards allow such a approach
This should work; the standards don’t specify that it’s not allowed. Check clause 6.5.5 in GB/T150.4-2011.
GB/T150 does not specify any requirements regarding the number of longitudinal welds; for equipment with a larger diameter, there will be more longitudinal welds, and it is sufficient to space them at certain intervals. Therefore, you can proceed in this way, especially when dealing with issues on-site, as the owner will not object.
Thank you for your reply. Clause 6.5.5 of GB/T150.4-2011 does not provide any specifications regarding the longitudinal welds of individual tube sections