1-10. EQUIPMENT DATA.
Weight and Dimensions.
Height, wheels down
Height, wheels retracted
Operating Temperature Range
-60°F to +95°F
Effluent Fuel Water Content
Less than 5 ppm by volume.
Effluent Fuel Solids Content
Less than 1 milligram per liter.
Storage Temperature Range
-65°F to +145°F
Section III. PRINCIPLES OF OPERATION.
1-11. SYSTEM TECHNICAL PRINCIPLES OF OPERATION.
General. The flow of fuel through the filter-separator is shown in figure 1-4. Unfiltered fuel is pressurized by the
fuel system pump assembly. The system pump discharge is connected to the filter-separator fuel inlet.
Air Purging. An air vent valve on top of the tank provides means for releasing trapped air from the tank during
filling and operation of the filter-separator.
Over-pressure Protection. The filter-separator is protected from high pressure damage by a pressure relief valve
on the top of the tank. This valve opens if tank pressure reaches 150 psig, letting the tank pressure down. The
valve closes automatically after the internal pressure is let down to a safe value.
First Stage Filter. The filter-separator first stage filter consists of 15 replaceable cylindrical elements. Each
element has a flow capability of 20 gpm. These elements used in parallel provide a conservatively rated flow of
200 gpm for the filter separator. Unfiltered fuel flows from the tank inlet, through perforated tubes mounted on
an internal wall of the tank, to the inside of the filter elements. The filter elements block solid contaminants, but
pass clean fuel out from their external surface. The second function of the filter elements is to coalesce
undissolved water droplets in the fuel. These droplets are gathered together by the filter element until larger
drops are formed. Then the water drops, being heavier than the fuel, fall towards the bottom of the tank. Water
collects at the bottom of the tank and is drained from the water sump manually.