ISO 12584:2013 pdf free
ISO 12584:2013 pdf free.Aerospace – Hydraulic fluid components – Expression of particulate contamination levels
The particulate contamination of a component is expressed by a level related to the number of particles in various size ranges and related to the wetted volume of the component. It is measured by counting particles after they have been extracted from the component by an appropriate extraction method (see ISO 18413).
The fluid cleanliness code of ISO 11218 has served as a basis for the drawing up of the component cleanliness code. This fluid cleanliness code quantifies the number of particles of given sizes present in a given volume (100 cm3) of fluid being analysed.
By definition, the contamination of a component is only present on its surfaces. Damage to components of the fluid circuit is caused only when particles detach from their surfaces and are transferred to the fluid in circulation. For this reason, the contamination of a component is quantified by the number of particles of given sizes present in a given volume of the component under analysis.
Extract the particulate contamination from the component using a method detailed in ISO 18413. The extraction method chosen shall be fully validated for the component being tested.
Analyse the extraction liquid using a technique detailed in ISO 18413 and obtain data at some or all sizes defined in Table 1, as specified in the Inspection Document. Present the data in terms of the differential number of particles in the relevant size ranges per component.
Wherever possible, or if otherwise specified, the complete volume of the extraction liquid shall be analysed.
The reason for this is to ensure the large particles are not ‘lost’ in the sampling and preparation processes.
The expression of the level of particulate contamination of a component according to ISO 12584 requires data on its wetted volume.
Tabulate the data obtained in 5.3 in a suitable reporting sheet and calculate the numbers of particles per 100 cm3 of the component volume. A typical form is given in Annex B.ISO 12584 pdf download.
