Issue with reinforcement bar placement
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Question: There is a DN25 connection opening on the head, which is a vertical opening. Is it necessary to install 3 reinforcement ribs in this case? It is recommended as a standard practice; smaller connectors may be unstable and thus require adjustment. For larger connectors with vertical openings, is adjustment still necessary? It’s like this: a pen placed on the ground is unstable; by welding its base, it becomes more stable, but it will still fall if subjected to some impact. So, with two or three reinforcement plates, it becomes stable. But if it’s larger, it’s no longer a pen; it seems to hold its shape quite well. Why is it necessary to set that?
Three fixings provide better balance. Using three for such a small fitting is somewhat wasteful and unsightly; it is recommended to make the extension shorter. If it is very long, then three fixings are still the best option. For reference only.
The self-weight of two horizontal + pipes is also equivalent to that of three. This is a question of being static or not.
Reinforcing ribs are added to the connector to increase its stability. What the original poster said is true – it has been welded and stands firmly in place. However, that is only the state after manufacturing; it is not the operating condition under which the structure is used. The loads experienced during operation are N times those in the manufactured state, and it is not uncommon for bending or breaking to occur during transportation or lifting. Moreover, as the length of the pipe increases, the probability of such risks rising significantly. Therefore, for safety reasons, it is very necessary to install reinforcing plates. The exact number of additional rods to use depends on the specifications and length of the pipes. There is extensive practical experience in this area; although regulations such as those from ASME Section 150 do not specify exact requirements, relevant industry standards or recommended practices are available, which provide many specific figures for reference :)