Products:

Depending on the design code, the application and on customer request, different materials are being applied. The shell and the water boxes are in general made from carbon steel. When there is a corrosive medium on the tube side, the water boxes are coated on the inside and anodes are mounted. GEA Bloksma has very good experiences with coated water boxes. In addition these water boxes are more economical than for instance cast bronze water boxes (which can also be made upon request). Another possibility is a complete stainless steel (AISI 316L) version of a heat exchanger.

The most frequently used materials for tubes and tube sheets are:

Tubes

• Carbon steel (St 35.8)
• Aluminium brass (CuZn20Al2)
• CuNi 90/10 (CuNi10Fe1Mn)
• CuNi 70/30 (CuNi30Fe1Mn)
• AISI 316L (X2CrNiMo 17.13.2)
• Titanium

Tube sheets

• Carbon steel (H-II)
• Muntz metal (CuZn38SnAl)
• CuNi 90/10 (CuNi10Fe1Mn)
• CuNi 70/30 (CuNi30Fe1Mn)
• AISI 316L (X2CrNiMo 17.13.2)
• Titanium

The tubes are roller expanded into the tube sheets. In case of thermal oil for instance the tubes are additionally seal-welded. This limits the material combinations of tubes and tube sheets. In case of strong corrosive media it is possible to apply a coating to the inside of the tube bundle (with of course a negative effect on the heat exchange).