9. Fluid behavior in the presence of water: water separation
Water contamination of hydraulic fluids is a frequent occurrence. Indeed, it is not uncommon for water to enter hydraulic circuits through :
temperature exchanger leak ;
condensation of atmospheric humidity after each shutdown (e.g. water from the compressor stage of an aircraft turbojet engine during pressurization of the hydraulic "tank" at morning startup);
water from an external working environment penetrating through a leak (cylinder gaskets, tank seals, etc.);
on-machine aqueous emulsification.
The ever-detrimental effects of this contamination include :
oxidation of metals, especially ferrous metals;
hydrolysis of certain...
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Fluid behavior in the presence of water: water separation
Neutralization index (acidity and/or basicity)
References
Standardization. Specifications
Association française de normalisation AFNOR
http://www. boutique.afnor.fr/
- Hydraulic transmissions – Fluids – Measurement of mineral oil filterability. Classification number : E48-690 - NF E 48-690 - 12-90
- Liquid petroleum products – Vapour pressure – Part 2: Determination of absolute vapour pressure (AVP)...
Hydraulic fluid analysis methods
Table 1 shows the equivalences between the various standards recommended by European and American standards bodies.
The numbers in the table refer to the comments below.
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