14
Appendix A
Necessary pressure dew point values t
pd
Depending on the type of application, different requirements can be
made on the air quality.
As the speed of corrosion on steel surfaces increases rapidly above
approx. 50%RH, this value should never be exceeded.
Field of application
Necessary pressure dew point values t
pd
Factory air, internal pipes
10 °C to -10 °C
Paint spraying
10 °C to -25 °C
Instrument air
10 °C to -40 °C
Sand blasting machine
5 °C to
0 °C
Pneumatic tools
5 °C to -25 °C
Pneumatic conveyor belt
5 °C to -60 °C
Transport vehicles (bus, etc.)
-13 °C to -33 °C
Cleaning of optical systems
-17 °C to -33 °C
Drying of electronic components
-20 °C to -40 °C
Factory air, external pipes
-20 °C to -40 °C
Chem. and pharmaceutical plants
-25 °C to -40 °C
The pressure dew point t
pd
is the temperature at which the compressed
air is fully saturated (100 %RH) .
