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Ferrous debris changes for d7918
The document outlines the changes in ferrous debris measurement options for grease thief samplers under ASTM D7918, emphasizing the need for design adjustments to maintain functionality in various applications. It highlights recent approvals and enhancements in analysis techniques, along with the discontinuation of certain models. Next steps include developing alternative devices and revising D7918 to support new calibration and testing methodologies.
Ferrous debris changes for d7918
- 1. ASTM D7918: CHANGESIN FERROUS DEBRIS MEASUREMENT OPTIONS
- 2. GREASE THIEF SAMPLERS– ASTM D7718 • Maintain purge function with little/no backpressure for drain applications • Allow relief of grease if sampler fills • Use of “Handle” tools to set depth • Designed to optimize the analysis process
- 3. ANALYSIS TECHNIQUES: ASTMD7918 • ASTM D7918 approved and published in 2015. • Particle counting and moisture ppm capabilities added recently • 6 tests with 1- gram of grease including Ferrous debris Die Extrusion Colorimetry Linear Sweep Voltammetry Elemental Spectroscopy FTIR Water in ppm rev 0 022817
- 4. FDM+ BY PARKERKITTIWAKE • Sufficiently large opening, use of adapters for different geometries • 5ml vial adapter with exact dimensions of D7718 Grease Thief • Several years of use and data under D7918 by multiple users • Is no longer being manufactured by Parker Kittiwake
- 5. ALTERNATIVE FERROUS DEBRISDEVICES • Parker FWM Ferrous Wear Meter • Smaller opening, narrow band detection • SpectroScientific FerroCheck • Smaller opeing, wider band detection
- 6. NEXT STEPS • Find/Developalternative ferrous device that can accommodate the current version Grease Thief • Revise external design of Grease Thief to remove non-critical features and reduce diameter to fit in existing instruments • Redesign cap to fit in reduced diameter • Create calibration standards in new dimensions • Develop correlation to previous instrument (FdM+) • Propose revision to D7918 to allow alternate instruments and provide calibration and testing process
- 7. NEXT STEPS • Find/Developalternative ferrous device that can accommodate the current version Grease Thief • Revise external design of Grease Thief to remove non-critical features and reduce diameter to fit in existing instruments • Redesign cap to fit in reduced diameter • Create calibration standards in new dimensions • Develop correlation to previous instrument (FdM+) • Propose revision to D7918 to allow alternate instruments and provide calibration and testing process
Editor's Notes
- #3 The Grease ThiefTM is pictured here. The red arrow shows the location of the purge hole, which allows excessive grease to purge out without creating backpressue in the bearing. It is recognized that many electric motor designs do not regularly purge grease out the drain hole when properly greased. It is not suggested that greasers pump enough grease in to fill this fitting. However, it can be substituted for the existing drain plug in many motors, and standby to catch any grease that might come out, instead of it falling to the floor. Then the captured grease can be analyzed. The red piston provides a visual indication of when the grease has begun to slump, leak or pressure drain into the fitting, indication of overgreasing, grease property changes, overheating of the bearing, etc.