Specifications

47
Appendix
If Using Portable Air (minimum of 185 cfm - 5.6 m
3
/min)
Portable diesel air compressors are mainly used for shop tools, not dry ice
blasting units and are therefore not able to cool or remove air moisture.
An after cooler with a 15°F (-9°C) approach is required to reduce the
discharge air temperature 180°F (82°C) to within 15°F (-9°C) of ambient air
temperature.
Without the after cooler, the following will occur:
1 Incoming air moisture will rapidly cool and freeze at the AeRO 75 (75-
DX) feeder.
2 Water ice will accumulate in the feeder, distorting the air flow and seal.
3 Water ice buildup will continue inside the blast hose, to the nozzle.
4 Water ice will break off inside the hose and lodge in the nozzle,
causing a jam.
5 Water ice, may exit the nozzle, and damage the target surface.
For the above reasons, an after cooler and moisture trap/filter must be
used.
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 75 (75-DX) the
air compressor needs to produce an air volume 10% greater than the blast
machine's maximum permissable air volume.
To determine adequate air volume, blast while watching the pressure
gauge.
• If the gauge drops slowly the compressor is insufficient.
• If the gauge drops quickly there is a restriction or the pipe is too small.
• If the gauge stays steady then the compressor is adequate.
To maintain adequate pressure, the hose size from the compressor to the
AeRO 75 (75-DX) needs to be 1 in (25 mm) in diameter.