Cold Jet Aero 40FP Operator's Manual page 29

APPENDIX A:
BLAST AIR QUALITY
PORTABLE AIR
Portable air compressors are mainly used for shop tools, not dry ice blasting units; therefore, they
may not be equipped to cool or remove air moisture.
approach is required to reduce the discharge air temperature 180 °F (82 °C) to within 15 °F
(-9°C) of ambient air temperature.
If an air cooler is not used:
• Incoming air moisture will rapidly cool and freeze at the Aero 40FP feeder.
• Ice may exit the nozzle and damage the target surface.
If blasting continuously, use an air dryer to further reduce the air moisture (dew point). Desiccant
dryers produce a dew point of -40 °F (-40 °C), resulting in a dew point low enough for continuous
blasting.
To verify the compressor is of adequate size for the Aero 40FP, the air compressor needs to produce
an air volume 10% greater than the Aero 40FP's maximum permissible air volume. To determine
adequate air volume, watch the pressure gauge while blasting.
• If the gauge drops quickly, there is a restriction or the pipe is too small.
• If the gauge stays steady, then the compressor and piping are adequate.
To maintain adequate pressure, the hose size from the compressor to the Aero 40FP needs to be a
minimum 1 in (25 mm) in diameter for lengths up to 100 ft (30 m). Longer runs may require larger
hose sizes.
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