"Compression Ratios" for pumping liquids 1

to simply state, when dealing with pumps, terms used are head or head/stage, expressed in feet or meters of water and flow expressed in gpm, lps, gph, etc.

i would definitely have a quizical or questionable facial appearance and would ask for clarification.

regarding gas compressor terms, your statements are understandable.

good luck.
-pmover

pmover has it correct.


PUMPDESIGNER

Thanyou Zdas04 for your question. It has helped me very much.

David

The reason why you talk of compression ration with gasses is that this is fairly constant with no regards to initial pressure but only for a limited inlet pressure range.

For a pump however the HEAD (as it is called) is constant when measured in height of liquid collumn - regardless of inlet pressure and medium. Providing that the casing dosnt burst i has the same head regardless of the inlet pressure beeing 1 or 10 barg.

The head is allways the same regardsless of liquid properties - but the outlet pressure (or even perssure rise) is no: Eg a pump with a head of 10 m (at a given flow rate) and a inlet pressure of 0 barg will have a outlet pressure of 1 barg when pumping water (density=1000 kg/m3) but out 0.8 barg if pumping a oil with a density of 800 kg/3m)

Best regards

Morten