Pipe connection
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Currently, there are pipes with dimensions 323.9x28 made of material Q345C, and pipes with dimensions 356x42 made of material 20# that need to be connected. I was wondering what methods could be used for this purpose? I think there are three options: 1. Connection using flanges. 2. Machine the large and small ends using Q345C. 3. Use 20# steel for the tees. What I would like to ask is: if 20# is used, in order to ensure that the smaller end can be welded to Q345C, it is necessary to keep the wall thickness and outer diameter the same as those of the Q345C pipe – is this feasible? Will the strength decrease? Thank you!
Either method works, but both require custom parts. Welding is also possible with different wall thicknesses, but the groove needs to be prepared; the strength will not decrease
The key issue is that the strength of a 28-wall-thickness piece of 20# steel is different from that of a 28-wall-thickness piece of Q345C – can it be used?
If there are no special requirements, isn’t it simpler to use flange connections?
Depending on the requirements of your pipeline, if welding is to be used, a bevel must be prepared; otherwise, due to different wall thicknesses, non-destructive testing cannot be successful
It works; this situation is quite common, for example with the ports of imported equipment