THE PRESENT MANUAL BELONGS TO - Schenker Italia - ALL RIGHTS RESERVED
16
CONCENTRATE OUTLET (OUT) AND SEAWATER INLET (IN)
FIG. 3-8
The watermaker group is composed by the following components:
• Reverse osmosis membranes
• Energy Recovery System
• Manometer
• Flowmeter
• Depressurization valve
• Positioner
• Reset valve
• Probe (pressure switch)
• Electric box
Reverse osmosis membranes, are installed inside the glass fibre high-pressure housing. Membranes are
n.1 x SW4040 type. Their 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.
Manometers. It is located on the front panel of the watermaker, and it measures the working pressure of the
watermaker.
Pulsation dampener is a grey PVC cylinder, 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.
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.
The valve must be closed during normal working conditions (vertical position), and it is opened during the air
bleeding operations (horizontal position).
Positioner. It is a stainless steel threaded arm, with a black knob, located on the right side of the watermaker.
Its function is to reset the unit in case of hydraulic block.
Reset valve. It is installed on the watermaker on the top of the ERS and it is recognizable by the little blue
plastic lever. The valve must be closed during normal functioning (lever perpendicular to the valve). Such valve
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