Tubesheet, which involves drilling holes slightly larger than the pipe outer diameter on a circular steel plate, serves as a circular steel that fixes the pipes and seals the medium in heat exchangers. It is a fitting that allows the pipes to be inserted and welded for this purpose. The precision of the tubesheet, particularly the spacing and tolerance of the pipe holes, as well as the perpendicularity and smoothness, all affect the assembly and operational performance of the listed chemical equipment.