Deep hole machining process
The deep hole machining process in heat exchanger plates (HEP) is used for the mounting of the tubes in the tube sheet. This is the thickest part of the heat exchanger, reaching out up to 800 mm (31.496 inch). It is also here where the heat source (primary side) intersects with the water in the heat exchanger vessel (secondary side).
The nuclear heat exchangers are operating at a high pressure which means that the HEP thickness is around 600 – 800 mm (23.622 –31.496 inch). The material used for these applications is a combination of low carbon steel and ISO S cladding or low carbon steel and stainless cladding. The cladding is applied by explosion or welding.
This is done with Single Tube System (STS) machine tools. These machine tools are configured with one or more spindles. The drilling is done horisontally so that means that the HEP is lying on the side. The heat source can be of different types like fossil fuels , recycled material or nuclear fusion reactors. The normal breakdown is non-nuclear and nuclear.
The non-nuclear heat exchangers are normally operating at low pressure which means that the HEP thickness is around 300 mm (11.811 inch). For these types of application a uniform material such as plain low carbon steel and stainless steel are used.
For these types of operations on the STS, we recommend
Learn more about STS system