The inner diameter of the stainless steel heat exchange tube is the inner diameter of the tube, and the outer diameter is the outer diameter of the tube.
The outer diameter is the main consideration when choosing to install a stainless steel heat exchange tube, because the outer diameter can determine the size and weight of the stainless steel heat exchange tube, and is also a key parameter for design and production.
Under the same working conditions, the inner diameter of the stainless steel heat exchange tube has a relatively small effect on the heat transfer performance, so the outer diameter is mainly considered.