THE PRESENT MANUAL BELONGS TO - Schenker Italia - ALL RIGHTS RESERVED
16
CONCENTRATE OUTLET (OUT) AND SEAWATER INLET (IN)
FIG. 3-9
The watermaker group is composed of the following parts:
• Reverse osmosis membranes
• Energy Recovery System
• Manometer
• Flowmeter
• Accumulator
• Depressurization valve
• Positioner
• Reset valve
Reverse osmosis membrane. It is installed inside the glass fibre high-pressure housing. Membrane type is
n.2 x SW4021 type. Its purpose is to separate the intake high-pressure seawater in two flows: one for the salt-
water drain and one for the fresh water production.
Energy Recovery System. It is the black, carbon fibre unit. It has the function to amplify the pressure supplied
by the pumps and to recoup the hydraulic energy back from the membranes. The ERS device makes periodic
cycling by a hydraulically controlled automatic valve. The cycles are noticeable through a ”beat” issued
periodically by the watermaker unit. The unit is based on cylinders and a central body containing the hydraulic
valve necessary for the system functioning.
Manometer. Located on the front panel, it measures the working pressure of the watermaker.
Accumulator. It is a grey PVC reservoir of air, installed in the watermaker. Its function is to reduce and stabilize
the pressure peaks during the watermaker functioning. The device has to be pre-charged with air through the
specific valve. The air pressure precharge is about 6 Bar. The pressure dimmer is charged in factory at the
right pressure.
Flowmeter. It is located on the front panel, and it measures the fresh water instantaneous capacity sent to the
tank. The device accuracy is +/- 20%.
Depressurization valve. It is used for the air bleeding of the unit. It is recognizable by a blue lever and it is
located on the top valve of the ERS. Its function is to depressurize the system and to allow the bleeding of air.
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