Tube sheet, which is a circular steel plate with holes slightly larger than the tube's outer diameter, serves as a round steel that fixes the tubes and seals the medium in a heat exchanger. A fitting that inserts the tube and welds it in place to perform this function.

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