EcoWater Systems ROHD SB Manuel De L'utilisation page 41

ECOWATER
S Y S T E M S
PRODUCT FLOW TOO HIGH
DATA RECORDING
4.15 OPERATING DATA:
The reverse osmosis data should be noted on a regular basis and compared to previously recorded data. The
best way is to create a document that is always filled in in the same way. At simple request we can send you
a standard document that can be used.
Feedwater temperature and pressure, TDS and product pressure primarily determine the product flow rate of
a reverse osmosis system. To accurately determine the performance of an R.O. system a few simple calcula-
tions are required to "normalize", or correct for changes in these factors. When comparing performance of the
system to determine if it needs cleaning or service it is important to always use normalized flow data. Many
times an apparent loss of flow is due to changes in the incoming water rather than a membrane problem.
4.16 NORMALIZATION OF DATA
1. Write down production flow
2. Write down permeate pressure
3. Write down feed pressure
4. Calculate net operating pressure
Subtract the permeate pressure frome the feed pressure
5. Calculate the pressure compensated flow rate
Production flow rate x 8,6 / Net operating pressure
6. Calculate the temperature compensated flow rate
Pressure compensated flow rate x Temperature correction factor (see table 1)
the drain valve fully open for 30 minutes so that the membra-
nes are flushed.
C. Check for low feed water temperature.
A. Drain flow is too low and needs to be increased.
B. Check for high feed water temperature.
C. Defective or missing O-ring on membrane and / or end caps
D. Presence of free chlorine that damages the membranes.
Measure free chlorine content.
m³/h
bar
bar
bar
m³/h
m³/h
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