Can the minimum length of a pressure vessel be less than 300mm
The minimum length of a pressure vessel can be less than 300mm, which is not limited.
Well, you could say that the average of 1L or 2L is less than 300.
Tube section length should be no less than 300 mm, see the first article 10.2.4.5 GB150, this is to prevent the manufacture process of using stock more than expected, in the heat exchanger tube box tube section design is not subject to this restriction.
