INVESTIGATION OF QUANTITATIVE SCREENING METHODS FOR FILTER DEBRIS ANALYSIS

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Authors
  1. Dopplinger, F.W.M.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);GasTOPS Ltd, Gloucester ONT (CAN)
Abstract
This report details the selection and evaluation of quantitative screening methodologies for Filter Debris Analysis (FDA). Two methods, discrete counting of ferromagnetic particles using a MetalSCAN sensor and quantification of the total mass of magnetic debris by magnetic separation and weighing, are evaluated using both prepared samples and debris from Sea King main gearbox filter backwashings. Tests conducted using prepared debris samples demonstrated that both the MetalSCAN and magnetic separation can accurately quantify the mass of ferromagnetic debris present. Tests conducted using debris from the DREA inventory of Sea King main gearbox filter debris patches indicated that both methods were equally capable of quantifying the amount of ferromagnetic debris present on the patch. Comparison between the test results and a visual rating of patches, while not demonstrating a strong correlation, did yield promising results with 5 of the 8 patches flagged for further examination by the visual rating method also being flagged by the two methodologies under evaluation. The lack of information such as engine hours and component condition which could be used to verify the state of wear represented by a debris sample prevented the determination of the thresholds which separate a normal gearbox from the experiencing abnormal wear. TRUNCATED.
Keywords
Particle counting;Magnetic separation;Filter Debris Analysis (FDA);Screening
Report Number
DREA-CR-95-464 — Contractor Report
Date of publication
01 Aug 1995
Number of Pages
37
DSTKIM No
96-01098
CANDIS No
155078
Format(s):
Document Image stored on Optical Disk;Hardcopy

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