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CHAPTER FLUID FILTERS 11.0 TABLE OF CONTENTS 11.1 INTRODUCTION 1 11.1.1 Filtration Mechanisms 3 11.1.2 Service Life 4 11.1.3 Filter Failure 4 11.2 FILTER FAILURE MODES 4 11.3 FLUID CONTAMINATION EFFECTS 6 11.4 FILTER RELIABILITY MODEL 7 11.4.1 Base Failure Rate 9 11.4.2 Filter Pressure Multiplying Factor 9 11.4.3 Vibration Multiplying Factor 10 11.4.4 Cold Start Multiplying Factor 10 11.4.5 Cyclic Flow Multiplying Factor 11 11.5 REFERENCES 12 11 11.1 INTRODUCTION Fluid filtration equipment is unique in that the reliability of this equipment is more concerned with the effects of the filter on associated equipment than on the lifetime of the filter itself. This is due to severe wear of fluid system components which can occur when these components are operated with poorly filtered fluid. Proper monitoring of filter reliability can minimize maintenance costs of the overall fluid system through contamination control of fluid system components caused by abrasive wear. Other problems in the fluid system that can be prevented by a reliable filter include the following: Increased internal and external leakage and lower efficiency of pumps, actuators, control valves and motors. Sticking of actuators and control valves due to sludge and collection of fine particles in critical operational areas. Seizure of components caused by large amounts of contaminants getting stuck in clearances. Corrosion within components from acids that form as a result of mixing of incompatible particles and fluids. Filters j-|_'|1 Revision B

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