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8. Behavior towards air: solubility of air in oil
The presence of air in a hydraulic circuit always leads to serious disturbances (cf. article
compressibility of the air-fluid mixture ;
oil oxidation ;
temperature rise due to this compression, resulting in accelerated weathering;
lubrication failure ;
cavitation.
The circuit must therefore be designed and maintained in such a way as to avoid air ingress wherever possible. As far as the fluid is concerned, it is necessary to give it two different properties:
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Behavior towards air: solubility of air in oil
Fluid behavior in the presence of water: water separation
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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