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A Comparative Investigation of Filter Performance Under Laboratory and Field Conditions
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English
Abstract
The Standard Multipass (Beta) Filter Method (ISO 4572) has been a highly recognized and widely accepted test throughout industry since its introduction in the early 1970's. In the past decade, the Beta Method has indeed made a major contribution in assisting users in selecting filters to meet system design requirements. However, many complaints have been voiced by users that filters normally produce a lower particle removal efficiency under field applications than they do during laboratory tests. Research results from work carried out at the Fluid Power Research Center at Oklahoma State University indicate that the degradation of the filtration (Beta) ratio in service depends mainly on the filter's retentivity characteristic.
This paper highlights the theoretical basis of the Epsilon Rating Method and the concept of retentivity. Most important, the paper uses these concepts to correlate filter performance between laboratory tests and field operation. Field operation is simulated using different particle ingression levels. In addition, cases presenting the bypass leakage effect and pressure-flow surge effect are also discussed.
Authors
Citation
Hong, I. and Fitch, E., "A Comparative Investigation of Filter Performance Under Laboratory and Field Conditions," SAE Technical Paper 860735, 1986, https://doi.org/10.4271/860735.Also In
References
- Hong I. T. Fitch E. C. “Assessing the Power to Capture and Retain Particles - The Epsilon Filter Ruling” The BFPR Journal 1986 19
- Hong, I. T. Fitch E. C. “An Innovative Technique in Filter Rating,” SAE Paper No. 851590 1985 SAE International Off-Highway & Powerplant Congress & Exposition Milwaukee, Wl 1985
- Tessmann R. K. “Influence of Contaminant Ingression Rates on Filter Performance,” Seventh Annual Fluid Power Research Conference Stillwater, OK 1973
- Bensch L. E. “Surge Flow Effects on Fitter Performance,” Seventh Annual Fluid Power Research Conference Stillwater, OK 1973
- Foord B. A. “Cold Start Filter Evaluation,” Eighth Annual Fluid Power Research Conference Stillwater, OK 1974
- Grade L. V. Bensch L. E. “The Influence of High Frequency Pump Ripple on Filtration Performance,” Ninth Annual Fluid Power Research Conference Stillwater, Oklahoma 1975