The diameter of stainless steel heat exchange tubes varies, and different sizes of tubes are suitable for different fluids.
If you choose a small diameter, you should choose a clean fluid for the fluid, because small diameter stainless steel heat exchange tubes are not easy to clean and are easily blocked by dirt during use. So if the fluid is turbid or viscous, you should choose a large diameter stainless steel heat exchange tube.
This is the difference between large and small diameters of stainless steel heat exchange tubes.