CO2-Recovery Plant 38 EN/2020
6. Routine check
When the CO2 Unit is in operation, there are multiple temperatures and pressures to keep track
of to make sure that the process is running optimally. Most of the information can be seen on
the Mimic Diagram, and additional information can be seen when zoomed in on a specific
component. When doing a routine check, you should at minimum but not limited to check the
following values:
Important temperatures
The temperature of the compressor should be between 60-63°C (During start-up it will be
lower).
The dewpoint temperature should be below -59°C.
Important pressures
The inlet pressure of CO
2
should be between 0,25 – 0,40 bar.
The pressure at liquefaction should be max 45 bar and the temperature of the coolant below
2°C.
The pressure indicators for the water separators should be 2,5-4,5bar on first stage, 12-18 bar
on second stage and 32-45 bar on third stage. The interval is marked with a red marker on the
pressure gauge for each stage.
Other important values
The frequency of the VFD and the power usage should be between 7-80Hz and maximum 5-6A.
The percentage of Oxygen on the inlet maximum 0,6%.
The average rotations before discharge of product should be from 9-17.
Make sure that the drain valves on the water separators are working – test once a week by
forcing them individually for a short amount of time and see that air/water is drained / blowing
out.
Check that drain valve is not leaking into the drain hose when closed.
Note: Always act if there is leakage or dissonant noises from the Unit.
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