Feed
Pressure
psi/bar
Retentate
Pressure
psi/bar
Filtrate
Pressure
psi/bar
TMP
psi/bar
Filtrate
Flow Rate
mL/min
Filtrate
Flux Rate
mL/min/cm
2
Filtrate
Flux Rate
LMH
Water Per-
meability
LMH/TMP
NWP
LMH/TMP
@ 20°C)
Table 2.
Table for recording data and calculating NWP
Measurement Temperature: ________°C, TCF _______
TMP = ( P
feed
+ P
retentate
)/2– P
filtrate
(Assume P
filtrate
is “0” if no filtrate pressure gauge)
Filtrate Flux Rate (mL/min/cm
2
) = Filtrate Flow Rate (mL/min) / membrane area of 50 (cm
2
)
To convert mL/min/cm
2
to LMH
LMH = mL/min/cm
2
x [1liter/1000mL x 60min/h x 10,000cm
2
/1m
2
] = mL/min/cm
2
x 600
Filtrate Flux Rate (LMH) = Filtrate Flux Rate (mL/min/cm
2
) x 600
Water Permeability (LMH/TMP) = Filtrate Flux Rate (LMH) / TMP
NWP (LMH/TMP @ 20 °C) = Filtrate Flux Rate (LMH) x Temperature Correction Factor (TCF) at operating temperature
Table 3
Temperature Correction Factors (TCF 20°C) for determining Normalizing Water Permeability
Temperature Correction Factors (TCF 20°C) for determining Normalizing Water Permeability
T °C TCF 20 °C T °C TCF 20 °C T °C TCF 20 °C T °C TCF 20 °C
11 1.271 21 0.978 31 0.781 41 0.641
12 1.235 22 0.955 32 0.765 42 0.629
13 1.202 23 0.933 33 0.749 43 0.618
14 1.169 24 0.911 34 0.734 44 0.607
15 1.139 25 0.890 35 0.719 45 0.596
16 1.109 26 0.871 36 0.705 46 0.586
17 1.081 27 0.851 37 0.692 47 0.576
18 1.053 28 0.833 38 0.678 48 0.566
19 1.027 29 0.815 39 0.665 49 0.556
20 1.000 30 0.798 40 0.653 50 0.547
8
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