Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 1106-E • 14 •
3) Liquid velocity under 2 m/s (to avoid liquid slugging).
4) For liquid risers, make sure that liquid subcooling is sufficient to counteract the loss of static pressure and
prevent gas flashing.
3.7.2 - Discharge lines and suction lines
Calculate these to obtain a gas velocity in vertical sections that enables compressor oil migration and steady return
to the compressor (tables C and D - page 15).
Determine the dimensions of vertical lines using the following tables.
Horizontal lines may be bigger in order to compensate pressure drop in vertical lines.
The total pressure drop in the piping has to be lower or equal to 1°C at saturation pressure on the suction side.
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