Troubleshooting The Ro Membrane - SpectraPure PROPLUS RO System Installation And Operating Manual

SpectraPure
TESTING THE QUALITY OF THE MEMBRANE:
Membrane Output Calculation
Membranes produce the rated gallons per day (GPD) at 60 psi (4.1 bars) operat-
ing pressure, 77°F (25°C) operating temperature and 500 ppm total dissolved
solids.
Membrane output gallons per day (GPD) depends on operating pressure, water
temperature and the ppm TDS in the feed water.
Expected GPD = Rated GPD × PCF × TCF
PCF is the pressure correction factor
TCF is the temperature correction factor
Calculation of Pressure Correction Factor (PCF):
the membrane is directly proportional to the applied pressure.
Note: The membrane is rated to produce the rated GPD at 60 psi. For any
pressure other than 60 psi the output GPD is multipled by the PCF.
PCF = Line Pressure (in psi) ÷ 60
Calculation of Temperature Correction Factor (TCF):
also decreases with decrease in temperature. This is because water viscosity
increases with decrease in water temperature.
Temperature Correction Factor Table (TCF)
°F /°C TCF
41.0 /5 0.521
42.8 /6 0.540
44.6 /7 0.560
46.4 /8 0.578
48.2 /9 0.598
50.0 /10 0.620
51.8 /11 0.640
53.6 /12 0.661
55.4 /13 0.684
57.2/14 0.707
SpectraPure®Inc .
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®
°F \°C TCF
59.0 /15 0.730
60.8 /16 0.754
62.6 /17 0.779
64.4 /18 0.804
66.2 /19 0.830
68.0 /20 0.857
69.8 /21 0.884
71.6 /22 0.912
73.4 /23 0.941
75.2 /24 0.970
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The output (GPD) from
The output (GPD)
°F \°C TCF
77.0 /25 1.000
78.8 /26 1.031
80.6 /27 1.063
82.4 /28 1.094
84.2 /29 1.127
86.0 /30 1.161
87.8 /31 1.196
89.6 /32 1.232
91.4 /33 1.267
93.2 /34 1.304
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