Programme checks accuracy of used oil testing
An
Environmental Reference Materials product story
Edited by the Engineeringtalk editorial team
May 16, 2002
Environmental Reference Materials is offering what it reckons is the most comprehensive programme of its kind to all companies who perform used oil testing or use the data from such testing.
Environmental Reference Materials is offering what it reckons is the most comprehensive programme of its kind to all companies who perform used oil testing or use the data from such testing to make important decisions.
The goal is to help users and suppliers of oil analyses monitor and determine the quality of their testing, evaluate new methods, train new analysts and certify testing equipment.
Each quarter, each participating laboratory will receive a set of two to four samples of used oil taken from machinery (engines, lubricated systems etc) to be analysed for the parameters of interest.
Parameters covered include ash content, BTU heating value, chlorine, flash point, fuel dilution, glycol, nitration, oxidation, particle count, pH, soot, specific gravity, sulphurs, TAN, TBN, viscosity, water, wear and contaminant metals, additive package elements and EPA metals.
Although many laboratories use them, ASTM methods are not required for this programme.
All participants receive a comprehensive report showing their results, coded to preserve anonymity, the method used, the mean of all results and the Z-score for each parameter after removal of outliers.
The Z-score is the number of standard deviations of a laboratory's result from the mean and is recognised as an appropriate way to compare results for samples without expected values, making it ideally suited for used oils.
Participants also receive customised individual reports to facilitate corrective action.
Interpretations of recommendations for equipment maintenance by participants are also compared.
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