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2.11 Permeate Back Pressure Correction Factors
It is often necessary to operate RO machines with permeate back pressure. Permeate back
pressure will decrease permeate production. See Table 2.5 (Permeate Back Pressure
Correction Factors) to calculate loss of permeate.
Table 2.5
E2/EZ2-Series
Permeate Back
Pressure Correction
Factors
W
ARNING: IF PERMEATE BACK PRESSURE EXCEEDS 60 PSI (4.1 BAR)
MACHINE DAMAGE MAY OCCUR.
W
ARNING: INSTALLING A CHECK VALVE WILL PREVENT REVERSE
FLOW THROUGH THE MEMBRANE ELEMENT WHEN THE
MACHINE IS NOT IN OPERATION. REVERSE FLOW, WHEN
THE MACHINE IS NOT IN OPERATION, CAN SEVERELY
DAMAGE THE MEMBRANE ELEMENTS.
8
BACK
PRESSURE
10 psig (0.7 barg)
20 psig (1.4 barg)
30 psig (2.0 barg)
40 psig (2.7 barg)
50 psig (3.4 barg)
60 psig (4.1 barg)
PRESSURE
CORRECTION
FACTOR (PCF)
0.95
0.90
0.80
0.70
0.60
0.50
% LOSS OF
PERMEATE
FLOW
5%
10%
15%
20%
25%
30%