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Applications
This test method is
intended for use in the laboratory or field in evaluating distillate fuel
cleanliness. A change in filtration performance after storage,
pretreatment, or commingling can be indicative of changes in fuel
condition. Causes of poor filterability in industrial/refinery filters
include fuel degradation products, contaminants picked up during storage
or transfer, incompatibility of commingled fuels, or interaction of the
fuel with the filter media. Any of these could correlate with orifice or filter
system plugging, or both.
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Model 1143 Micro-Filter Analyzer
Theory of Operation
A sample is passed at a constant rate (20 mL/min) through a standard porosity filter medium.
The pressure drop across the filter and the volume of filtrate are
monitored. The test is concluded either when the pressure drop across the
filter exceeds 105 kPa (15 psi) or when 300 mL have passed through the filter. The final pressure
and volume are displayed. Using the final pressure and volume a third
value, filterability quality factor (F-QF), is calculated and displayed
The F-QF has a range from 0 to 100 where higher values indicate less
particulate contamination.
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