Aqua-Base ARUBA Comfort 60I Manual De Utilización página 20

AQUA-BASE
ARUBA Comfort
Technical manual
3.7 Operating conditions
Using the watermaker in seawater with low salinity (brackish water) versus treatment of seawater
with high salinity.
In the reverse osmosis process, the main water parameters to
take into account, are temperature and salinity. The main running
parameters of the watermaker to consider, are production flow
and operating pressure.
The thresholds of the watermaker are fixed:
-
Fresh water production capacity (60 – 300l. / h).
-
Maximum operating pressure (70 bar).
Either of these thresholds will be the limiting factor of the
machine.
The capacity of the watermaker is based on treatment of an
"average seawater" with a salinity of 35 g/l at 25°C. This water is
mostly found in the ocean. Other bodies of water may have
deviating parameters.
In average, or close to average conditions, the machine should operate as rated. But as the sea water
conditions deviate too much from this average, the machine could hit one of its limiting thresholds.
Cold water or High salinity water:
It is more difficult to push water through the membrane;
a higher pressure is needed to attain the rated
production, the limiting factor will be operating
pressure.
As a result, the machine will produce less water than
its rated capacity (l/h).
Warm water or Low salinity (brackish) water:
It is less difficult to push water through the membrane;
less pressure is needed to attain the rated production,
the limiting factor will be the machines rated capacity
(l/h).
As a result, the machine rated capacity (l/h) will be
attained before its maximum operating pressure.
Conclusion:
If one of the thresholds of the machine is reached, it is advised to measure the temperature and salinity
of the seawater in order to understand the running parameters of the watermaker.
•
Example:
The machine operates in a high salinity body of water: the
pressure in the membrane is close to 70 bar but the
machine produces less than its rated capacity (60-300 l/h).
This is a normal phenomenon
Example:
The machine operates in a low salinity body of water: the
pressure in the membrane is far from its limit of 70 bar (at
45 bar for example) but the machine produces already its
rated capacity (60-300 l/h).
Do not try to attain a higher pressure, the
membranes will "over produce" witch causes
delamination of the membrane and drastically
reduces the lifespan.
REV.J
P20/108