Standard Practice for Evaluating Compatibility of Mixtures of Hydraulic Fluids

Importancia y uso:

5.1 Hydraulic fluid compatibility is important to hydraulic equipment users because a mixture of incompatible fluids may produce a substance that is markedly inferior to its constituents. Even in identical base stocks, the formation of a precipitate may occur as a result of additive interactions. In this practice, compatibility will be determined using ISO 13357-1 filterability test method. Since hydraulic systems utilize fine-filtration to protect components from wear, incompatibility often exhibits itself as premature filter plugging.

5.2 Because of such occurrences, suppliers recommend evaluating the compatibility of hydraulic fluids prior to mixing. A flowchart is provided in Annex A1 to aid in interpretation of the test results and hydraulic system conversion.

5.3 Although new hydraulic fluids may be compatible, in-service fluid of the same type may be degraded or contaminated to such an extent that the new fluid added may not be compatible with the system fluid. In-service fluid compatibility with new fluid additions should be evaluated on a case by case basis.

5.4 The oxidation resistance and wear protection of different fluids of the same type can vary widely, and compatibility does not imply equivalent performance.

Subcomité:

D02.N0

Referida por:

D8029-23, D8324-21, D6158-23

Volúmen:

05.04

Número ICS:

75.120 (Hydraulic fluids)

Palabras clave:

compatibility; filterability; hydraulic fluid; mixtures;