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The analysis and description of field generated containment in fluid systems (hydraulic or lubricating oil, fuels, water, etc.) continues to be one of the best indicators of system “health.” The monitoring of the contaminant provides an effective health measure by accurate determination of the contributing factors to system degradation. These include solid particles, water, additive depletion, and a host of resultant synergistic effects such as sludges, gels, etc. Their are many options available for field fluid analysis. Five specific analyses have been found to provide an extensive description of field contaminants. They are particle counting, gravimetric level analysis, proton induced X-ray emission (PIXE) analysis, ferrographic wear debris analysis, and water content analysis. Thorough descriptions of this procedures is provided with detailed application considerations.

This paper reports on a study that investigated the effect of composite contaminants on the wear of ball type valves. The objective was to develop a contamination control theory for predicting valve contaminant service life based on various mixture ratios of a silica test contaminant and a ferrous test contaminant. Filter specifications were determined which ensure valve contaminant service life. Theoretical considerations drew on contamination control theory and new relationships are introduced which account for ball valve wear due to two contaminants. Experimental tests were conducted with the Zeta test machine to establish particle abrasivity ratings and with the valve contaminant test stand to determine valve pressure degradation to contamination. It was found that less abrasive particles result in less valve performance degradation. This result substantiated the theoretical expressions relating the valve wear composite contaminant sensitivity coefficients.

The focus of this paper is the interpretation and application of the Multipass Filter test- more commonly known as the Beta test for determining a filters (or medias) Beta Rating. A specific Beta test report is deserved and analyzed. A review of the required test equipment for conducting a Multipass test is provided and many test operating conditions are described. The Beta Rating definition and detailed points for conducting a Beta test are also given.