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Selection of Refrigerant Piping Size
The connection piping size for refrigeration unit is, in principle, as shown
below, but each installation should be determined by calculating pressure loss
of the piping and refrigerant flow speed and making sure no problem occurs in
the cooling capacity and oil return.
As refrigeration unit using CO2 refrigerant incurs pressure higher than when
using traditional refrigerants, it is necessary to choose adequate materials.
Make sure that piping’s are connected to the appropriate pressurized
equipment (EN378-2).
Prevent contamination of foreign objects
such as dust, metal powder, oxide scale, etc.
Since the compressor consists of high precision components, contaminants
generate scratches on the sliding surfaces, thereby increasing gas leak,
deteriorating performance, and causing excessive wear and seizure.
– Flow nitrogen gas during welding.
– Piping inside and outside must be clean.
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