Standard Test Method for Ferrous Wear Debris Monitoring in In-Service Fluids Using a Particle Quantifier Instrument

Importancia y uso:

5.1 This test method is intended for the application of PQ magnetometry in assessing the progression of wear in machinery, for example, engines and gearboxes, by trending the mass of ferrous debris in samples of lubricating oils or greases.

5.2 In-service oil analysis is carried out routinely by commercial laboratories on a wide range of samples from many sources and is accepted as a reliable means of monitoring machinery health by trend analysis. In particular, the extent of wear can be readily assessed from any changes in the ferrous debris burden within periodically extracted samples as reflected in the PQ Index.

5.3 PQ measurements can be used as a means of rapidly screening samples for the presence or absence of ferrous wear debris, allowing quick decisions to be made on whether or not to proceed to a more detailed spectroscopic analysis for probable wear metals in the sample.

5.4 The use of standardized sample containers and a consistent protocol enables reliable trending information to be recorded. Although it is not possible to assign general limits or thresholds for abnormal conditions, it is recommended that interpretation of PQ values should be carried out in consultation with historical data, equipment logs, and/or service history in order to formulate guidelines on individual items of machinery. Guide D7720 is particularly useful in this context.

Subcomité:

D02.96.06

Volúmen:

05.05

Número ICS:

75.100 (Lubricants, industrial oils and related products)

Palabras clave:

ferrous wear debris; oil analysis; PQ Index;