Tube sheet, which is a round steel plate with holes slightly larger than the outer diameter of the tubes, serving as a circular steel that fixes the tubes and seals the medium in heat exchangers. A component used to insert and weld the tubes in place, performing this function.

The precision of tube plate processing, particularly the spacing and tolerance of tube holes, diameter, perpendicularity, and smoothness, all significantly affect the assembly and operational performance of the listed chemical equipment.

Pipe plates for pressure vessels of types three and four require higher precision. Traditional hole processing methods include fitter marking and arm drill boring. With the large-scale of chemical containers, the diameter of pipe plates is also increasing, and their thickness is gradually thickening. CNC technology has been introduced into pipe plate processing, with CNC drilling machines commonly used for initial hole making in conjunction with arm drills for the actual hole processing. High-precision hole processing using machining centers is gradually being accepted by some large enterprises. There is an increasing demand for heavy-duty pipe plates in the fields of nuclear power, seawater desalination, and central air conditioning heat exchangers.