6
– MAINTENANCE (ROUTINE AND SPECIAL)
COD.
60M12/24.D.2018
EN
THE PRESENT MANUAL BELONGS TO -
Schenker Italia
- ALL RIGHTS RESERVED
43
Purge air from the
system periodically by
opening
for 2-3 minutes
the depressurization
valve at 45°.
Every 15-20 days
6.2 Check the plant working pressure
It is necessary to read the pressure on the
manometer located on the equipment front
panel in order to perform this verification.
The working pressure depends on many
factors such as water temperature, salinity
level of seawater, effective batteries voltage,
membranes cleaning degree, typology of
installation.
The pressure, in normal working conditions
with both pumps activated, is approx. 6 -7
Bars.
When working with only one pump activated,
operating pressure drops at around 5 bar.
There is a small pressure drop, in the range
of 0,2 bar, during the cycle.
If the average pressure exceeds the above ranges it is necessary to check the membranes cleaning degree.
It is necessary to perform the shutdown procedure if the membranes result dirty. If cleaning also results
insufficient it could be necessary to perform an alkaline washing using the chemical product SCHENKER
CLEANING 2 (SC2). It is recommended to contact a Schenker certified service center.
6.3 Check for leaks
It is necessary to perform this verification at every plant start-up and however often, since possible leaks due
to accidental causes (hose bursting, hose clamp loosening, equipment failure, etc.) may occur, even plentiful,
with the consequence of possible damages.
6.4 Check for membranes replacement
The reverse osmosis membranes have a 7 years average working life. It is recommended therefore, after 5
years of operation, to verify the possible necessity of substitution and however to perform the substitution after
7 years.
6.5 Shutdown procedure
It is necessary to perform the shutdown procedure before standstills longer than 3 months, for instance before
the winter laying up.The purpose of the shutdown is to flush the system from possible organic and inorganic
sediments, and inhibit the growth of bacteria that could reduce the reverse osmosis membranes efficiency.
