Cold Jet Aero 40 HP, Operator'S Manual

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Using Plant Air
(Central Compressed Air System)
Manufacturing plants, with central compressed air systems, should have
an After Cooler and a 2-stage coalescing ilter assembly downstream of
the receiver tank. Hot metal pipes are an indication this is needed.
To verify that the plant air system is adequate for your blast system the air
compressor needs to produce an air volume 10% greater than the blast
machine’s maximum air volume...in addition to the air volume consumed
by normal plant operation.
To determine adequate air volume, watch the pressure gauge while
blasting.
• If the gauge drops slowly the compressor is insuficient.
• 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 to the blast system:
• From the air compressor to 50 ft (15 m) use a lexible 1 in (2.5 cm) air
hose (preferably the hose supplied with the machine).
• From the air compressor to beyond 50 ft (15 m) make sure the pipe is
1 in (2.5 cm) in diameter before attaching the air hose.
If an air drop isn’t used much, water and rust will collect in the line. Before
plugging into the air supply, purge the line, to prevent contamination of
the blast system.
Using Portable Air
(minimum of 185 cfm - 5.6 m 3 /min)
Portable diesel air compressors are frequently not optimized for dry ice
blasting units and are therefore not conigured to cool or remove air
moisture.
The After Cooler is required to reduce the discharge air temperature
180°F (82°C) to within 15°F (-9°C) of ambient air temperature. Visit
coldjet.com to learn more about purchasing an After Cooler.
Without the After Cooler, the following will occur:
1. Incoming air moisture may rapidly cool and freeze at the feeder.
2. Water ice may accumulate in the feeder, distorting the air low and
seal.
Blast Air Quality