SpectraPure MAXCAP RO/DI System Installation And Operating Manual page 16

SpectraPure
Membrane Output Calculation
Membranes produce the rated gallons per day (GPD) at 60 psi (4.1 bars)
operating 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 output (GPD) from
the membrane is directly proportional to the applied pressure.
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): The output (GPD)
also decreases with decrease in temperature. This is because water viscosity
increases with decrease in water temperature.
Temperature Correction Factor Table (TCF)
°F /°C
41.0 /5
42.8 /6
44.6 /7
46.4 /8
48.2 /9
50.0 /10
51.8 /11
53.6 /12
55.4 /13
57.2/14
SpectraPure
16
TCF °F /°C
0.521 59.0 /15
0.540 60.8 /16
0.560 62.6 /17
0.578 64.4 /18
0.598 66.2 /19
0.620 68.0 /20
0.640 69.8 /21
0.661 71.6 /22
0.684 73.4 /23
0.707 75.2 /24
Inc.
®
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
®
TCF °F /°C
0.730 77.0 /25
0.754 78.8 /26
0.779 80.6 /27
0.804 82.4 /28
0.830 84.2 /29
0.857 86.0 /30
0.884 87.8 /31
0.912 89.6 /32
0.941 91.4 /33
0.970 93.2 /34
TCF
1.000
1.031
1.063
1.094
1.127
1.161
1.196
1.232
1.267
1.304