TM 5-813-8
Figure A-23. Plan review of a two-pass reverse osmosis system.
Source Neptune MiroFIoc Inc
milliliters of solution through the same filter (operating at the constant pressure 30 pounds per square inch gauge) 15
minutes later. Between these two time periods (TB = 15 minutes) the solution must be continuously fed to the membrane
filter under a constant 30-pound-per-square-inch gauge pressure differential. The silt density index is then calculated in
the following manner:
Symbols:
T1 =Time for first 0.132 gallons to pass filter
TB = Time between two measured 500-milliliter samples, usually 15 minutes
T2 =
Time for second 500-milliliter sample to pass filter
SDI = Silt Density Index
A-42
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