Technical Reference
Donaldson provides this technical reference as a short course in “Engine Liquid Filtration 101”—for those who want to gain a better understanding of fluid filtration for engines.This guide is offered to aid in choosing the filter that will help you achieve the ideal cleanliness levels and longest life for your critical components. In engine applications all over the world, we too often see engine systems that don’t include proper fluid filtration, especially fuel. Good filtration needs to be an integral part of the circuit to ensure the long life and proper operation of the pumps, turbos, injectors and bearings. Today diesel engines are very sophisticated with many precision systems working together. These systems require optimum filtration to ensure their performance.
Topics Engine Components Need Protection ..................................................................48 How Contamination Damages Precision Parts......................................................48 Where Contamination Comes From......................................................................49 Filter Design and Construction...............................................................................50 Materials and Design Characteristics.....................................................................51 Filter Media Design and Development...................................................................52 Basic Filtration Principles.......................................................................................53 Liquid Filtration Pressure Drop...............................................................................54 Combining the ISO Rating and Filter Performance Ratings...................................55 ISO Rating System.................................................................................................55 Filter Efficiency Ratings..........................................................................................56 Frequently Asked Questions..................................................................................57 Fuel ...........................................................................................................57 Lube. ......................................................................................................... 58 Coolant...................................................................................................... 58 Custom System Design Application Worksheets Fuel Filtration Application Design Worksheet.........................................................61 Lube Filtration Application Design Worksheet.......................................................63
Symbols Used ß Beta Ratio cSt Centistokes DP
Pressure Drop or Differential Pressure International Standards Organization
ISO
µm
Micron or micrometer
ppm SSU SUS
Parts per million
Saybolt Seconds Universal
Material in this section is in the public domain, not confidential, and may be copied for educational purposes at any time. Information was collected from many sources, both public and private, including Donaldson Company, Inc. Engineering Departments, Society of Automotive Engineering (SAE), ISO, and various industry authorities.
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