Fuel Filtration Overview
Diesel Engine Fuel Filtration Systems Diesel fuel and diesel fuel systems are ever-changing technologies. Over the past decade, numerous emission standards and engineering achievements provided some of the most advanced, clean, and flexible engine designs, yet the advancements have also included the acceptance of alternative forms of fuels such as biodiesel. Fuel filter performance and technology have also been challenged by these rapid changes. Today secondary filtration demands 4-5 µm absolute efficiency at 99.9%, while matching with an upstream primary filter of 7-25 µm at 99% efficiency (per ISO 19438). These changes come with the expectation that water separation, filter efficiency and life remain constant or are improved upon. Donaldson engineers have proven to be up to this challenge through the advancement of media technologies.
Fuel filtration today is an integral part of the complete fuel system. A well designed fuel system takes contamination control into account from the beginning. Water separation, particulate and non- traditional contaminants need to be controlled. Engineers must be conscious of the relationship between the fuel circuit design and overall system cleanliness. Global fuel quality concerns are critical and end user needs need to be understood. Documentation such as the World Wide Fuel Charter exists to promote convergence of various regional practices. Fuel system design type, preferred alternate fuels and maintenance practices must be taken into account during the design process. Providing lasting, high quality fuel filtration solutions to our customers is our goal at Donaldson.
TYPICAL DIESEL ENGINE FUEL CIRCUIT
SECONDARY FUEL FILTER New Requirements (4-5 micron @ 99.9%) Historical Requirements (4-15 micron) Designed to protect the injection pump, the secondary fuel filter can withstand higher pressure than the primary filter.
99.9% EFFICIENCY
High Pressure Injection Pump
High Pressure Clean Fuel
Pressurized Fuel
Check Valve
Fuel Injectors
Hot Fuel
Transfer Pump
Fuel
PRIMARY FUEL FILTER New Requirements (7-25 micron) Historical Requirements (10-50 micron) Installing a large capacity, water separating filter on the suction side of the transfer pump helps filter out contaminants and water from fuel before reaching the transfer pump.
99% EFFICIENCY
Air
Fuel
Water
Fuel Tank
Prevent water and other contaminants from breeching the fuel storage tank by adding filtration to bulk fuel storage.
Engine Liquid Filtration • 11
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