Strengthening multiple openings in pressure vessels!
Thread Content
I encountered this problem at work: a split cylinder with a diameter of 600, equipped with multiple air outlet ports that are arranged quite closely together. Two of the adjacent connections have a diameter of φ273, and the distance between them is 500. I used overall reinforcement without using any reinforcing rings. I would like to ask everyone: is it still necessary to consider the requirement for reinforcement through multiple openings (Chapter 8 of GB150)? Personally, it seems there’s no need to consider it!
If multiple opening reinforcements are not taken into account, how is this overall reinforcement achieved? ;P
In my opinion, if SW6 is used, this factor will not be taken into account during the strength calculation; these aspects will need to be considered again after the calculation is completed.
It is highly recommended to use thick-walled pipes; although the cost is slightly higher, it requires less processing time and results in higher quality! Manufacturers of pressure vessels generally choose this method. Practicality comes first; everything should be based on reality, and everything must serve production!
Steam cylinders are usually reinforced by thickening the wall thickness of the cylinder body; of course, calculations for reinforcement through openings are also required, and sometimes we take into account the weakening factor due to exhaust holes when checking the cylinder.
GB150 specifies that the use of thick-walled pipes allows for the exemption from calculations related to reinforcement through drilling holes! Although sometimes using thick-walled pipes for the calculations may not necessarily be sufficient, there are regulations that allow exemption from such calculations; it’s somewhat like taking shortcuts
Personally, I recommend overall reinforcement using thick-walled pipes, as it is more economical; combined reinforcement is rather complicated. However, the reinforcement of thick-walled pipes must meet the calculation requirements.
Reinforcing the cylinder sections with thick-walled tubes is the most economical option, and it is also simpler to manufacture.
I calculated it based on an increased wall thickness of the cylinder; it’s necessary to check whether reinforcement is required, just to be sure.