Tube sheet, which is a circular steel plate with holes slightly larger than the tube outer diameter, serves as a circular steel in heat exchangers that fixes the tubes and seals the medium. It is a fitting that allows the tube to be inserted and welded in place, performing such a function.

The precision of tube plate processing, particularly the spacing and diameter tolerances of the tube holes, perpendicularity, and smoothness, affects the assembly and operational performance of the listed chemical equipment.