CO2 LP only

Hi,
could somebody explain how CO2 transcritical booster works in only LP opperation?

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I think the booster is what we would call a compound system or
a two stage system. The LP compressor raises the pressure to the
MP, pressure.

To lift the pressure with one comp only is beyond the capabilities
of a single (piston) compressor so it has to be done in two stages.

http://www.r744.com/web/assets/compa...ter_system.pdf

Rob

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