Nitrogen and Hydraulics
Name: Grant L.
Pure Nitrogen gas is used for energy storage in hydraulic
Some large, low pressure accmumlators have no membrane to separate the oil
The nitrogen eventually gets disolved/diffused into the oil and
periodically needs to be recharged.
Does the nitrogen dissolve faster at higher pressures?
How deep into the oil will the nitrogen penetrate?
The general rule is: Gases become more soluble in a solvent when the
pressure increases. This is expressed quantitatively by Henry's law that
states that the pressure is proportional to the concentration of the
dissolved gas -- P = k*C, where P is the gas pressure, k is an empirical
constant, and C is the concentration of the dissolved gas (all quantities
being in a consistent set of units. The "bends" suffered by deep sea divers
is a consequence of the same trend in the solubility of nitrogen in blood.
As an aside, the solubility of gases to my knowledge, decreases with
Click here to return to the Engineering Archives
Update: June 2012