Tube sheets, which are circular steel plates with holes slightly larger than the tube outer diameter, serve as round steel components in heat exchangers to fix the tubes and seal the medium. They are a type of fitting that allows the tubes to be inserted and welded in place for this purpose.

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

Baffles for pressure vessels in categories three and four require higher precision. Traditional hole processing methods include fitter marking and arm drill drilling. With the large-scale of chemical vessels, the diameter of baffles is continuously increasing, and their thickness is also gradually thickening.数控 technology has been introduced into the processing of baffles, with CNC drilling machines commonly used for pilot hole making and arm drills for hole processing. High-precision hole machining using machining centers is increasingly being accepted by some large enterprises. There is an increasing trend of demand for large, thick baffles in the fields of nuclear power, seawater desalination, and central air conditioning heat exchangers.