The liquid CO2 transfer pumps manufactured by Smith Precision Products of California are designed for moving large quantities of bulk carbon dioxide between two low pressure vessels, where the differential pressure does not exceed 4.8 bar, typically between a road tanker and a CO2 bulk storage tank. The complete range includes pumps with CO2 transfer capacities between 0.5 te/h and 35 te/h.
The Smith pumps use precision-cut, interlocking gears to propel the liquid carbon dioxide. The gears are lubricated by the liquid CO2 and hence run oil free. The shaft seal assembly which turns the drive gears is connected directly by means of a coupling to the electric motor and can be run at speeds of up to 1800 rev/min, although a slower running speed is recommended to prolong pump life.