6 – MAINTENANCE (ROUTINE AND SPECIAL) REV.02
THE PRESENT MANUAL BELONGS TO - Schenker Italia - ALL RIGHTS RESERVED
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6.2 Flushing procedure
It is necessary to carry out a washing procedure preferably after each use of the machine in order to remove
the salt contained in the machine and to extend the life of the reverse osmosis membrane. For this procedure,
5 liters of non-chlorinated water must be used (the water produced by the watermaker is perfect for the
purpose). Maintenance hoses are supplied with the system to make the process easier.
The washing procedure is as follows.
• Collect 5-6 liters of non-chlorinated fresh water in the portable tank (the one produced by the watermaker is
fine).
• Connect the maintenance suction hose to the watermaker and immerse the hose in the tank.
• Connect the drain hose to the watermaker and leave it overboard (or in a vessel drain).
• Open the depressurization valve (approximately ¼ turn).
• Activate the watermaker until the fresh water contained in the tank is completely empty.
6.3 Check the watermaker working pressure
The working pressure of the pump is indicated on the
manometer of the main unit.
The working pressure depends on many factors, such
as water temperature, seawater salinity, batteries
voltage, membranes conditions
The pressure, in normal working conditions, is in the
range 6,5-7,5 bar. There is a periodic small pressure
peak (during commutation) of 0,1-0,2 bar.
If the average pressure exceeds the above range, it is necessary to check the membranes cleanliness. If the
pressure exceeds the abovementioned range, it’s highly likely that the membrane is dirty or clogged, and it is
necessary to perform a cleaning with the chemical SC1. If the cleaning with SC1 is not enough to reduce the
pressure, it might be necessary an alkaline washing with the cleaning SC2.
6.4 Check for leaks
It is necessary to perform this verification at every watermaker start-up and frequently, as possible leaks due
to accidental causes (hose bursting, hose clamp loosening, equipment failure, etc.) may occur causing
possible damages.
6.5 Check for membranes replacement
The reverse osmosis membranes last for an average period of time of 6-7 years. When the membranes are
old, the quality of water usually decreases whereas the working pressure increases. If chemical washings do
not produce significant improvements, it is recommended to replace the membranes.
6.6 Shutdown procedure
It is necessary to perform the shutdown procedure before standstills longer than 2-3 months, for instance
before the wintering.
The purpose of the shutdown is to flush the system. This might be useful in order to prevent the system from
the creation of organic and inorganic sediments, as well as inhibit the growth of bacteria that could reduce the
reverse osmosis membranes efficiency.
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