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distribution system and may contain significant amounts of water that
cannot be captured in the separators. As the air cools after it passes
through the ducts, it may reach the dew point, causing water droplets to
be expelled, which may be after the separator. The optimum size of the
airbox is at least 100 litres.
4. An efficient filter with sufficient capacity, an oil and condensate separator
or a pressure regulator must be installed at the outlet if the compressor
operating pressure is higher than 8.5 bar. These elements must be rated
for a flow rate of at least 370 l/min so as not to cause a drop in outlet
pressure during cutting.
5. The inside of the airbox should be coated against corrosion.
6. The compressor intake should be fitted with an efficient intake air filter,
especially for mobile compressors when operating in dusty environments.
Caution
Some compressors have a built-in pressure air mixer at the
outlet. Under no circumstances must the plasma cutter be connected to
this outlet! This would contaminate the entire pneumatic system and could
damage the torch.
Connection to the central air distribution system
1. Before connecting, determine the working pressure in the system and the
extent of its fluctuation.
2. During cutting, the working pressure must be between 5.0 and 6.0 bar. To
achieve maximum cutting performance, we recommend that the pressure
does not drop below 5.5 bar.
3. Check the performance and technical condition of the central
compressor(s). The same requirements as above apply here.
4. Check the design and condition of pressure air filtration and condensate
trapping.
5. Ensure that the system is not centrally lubricated.
6. Include an additional filter and separator at the connection point closest to
the cutter. This is particularly important for older pipes made of
conventional steel pipes where the inner walls may be badly corroded. A
filter and separator is essential for systems with long ducts that pass
through cold environments where the compressed air may cool to the dew
point, causing condensation of water droplets.