6
– MAINTENANCE (ROUTINE AND SPECIAL)
COD: 100M12/24.B.2021
EN
THE PRESENT MANUAL BELONGS TO -
Schenker Italia
- ALL RIGHTS RESERVED
35
Purge air from the
system periodically by
opening
for 2-3 minutes
the depressurization
valve.
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, is
approx. 7,5
– 8,5 Bars. There is a small pressure lost
head, in the range of 0,4 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 centre.
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 (pipe bursting, pipe 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.
