Why can a water ring vacuum pump achieve a high vacuum level when pumping air, but it is slow and difficult to achieve the same level when pumping hydrogen?
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The water ring vacuum pump is of model 2BV, with inlet and outlet pipe diameters of DN15, a vacuum chamber volume of 260 L, and a pumping speed of 14 L/s.
The average molecular weight of air should be around 29, but since the molecular weight of hydrogen is 1, it’s understandable that not enough can be drawn off!
The pumping capacity of a vacuum pump is related to the molecular weight of the gas being pumped; the lower the molecular weight, the lower the pumping efficiency