Tube sheet, which involves drilling holes slightly larger than the tube's outer diameter on a circular steel plate, serves as a round steel that fixes the tubes and seals the medium in heat exchangers. It is a fitting that allows the tube to be inserted and welded in place for this purpose. The precision of the tube sheet, particularly the spacing and tolerance of the tube holes, perpendicularity, and finish, all affect the assembly and operational performance of the listed chemical equipment.