6
– MAINTENANCE (ROUTINE AND SPECIAL)
COD: 100M12/24.B.2021
EN
THE PRESENT MANUAL BELONGS TO -
Schenker Italia
- ALL RIGHTS RESERVED
39
6.6 Antifreeze procedure (Winterizing procedure in cold climate - under 5°C)
It is recommended to first perform the normal shutdown procedure by using SC1 in order to clean the system
properly and prevent bacteria growth and inorganic material deposit.
After this operation, Then the system must be flushed and filled with an antifreeze.
The recommended antifreeze product is a solution of
propylene glycol and unchlorinated water
.
The ideal concentration of propylene glycol is
-
45% (for temperatures up to - 20°)
-
55% (for temperatures up to - 30°).
ATTENTION
Do not use ethylene glycol as this substance is toxic and non-degradable.
The total volume of the solution must be about 15 lit.
The procedure is similar to that used for chemical washing with SC1 and SC2 products:
1.
Prepare the solution carefully mixing the propylene
glycol with 15 lit of unchlorinated water
by following
the concentration suggested above.
2.
Disconnect the drain pipe and the pumps suction pipe.
3.
Connect two pipe pieces to the drain and to the pump
suction.
4.
Insert the end side of the pipes into the bucket, verifying
that the pipes have been properly
dipped in the solution and that they don't inhale air.
5.
Open the depressurization valve.
6.
Start the watermaker with the by-pass activated.
7.
Leave the unit running for approx. 15/20 minutes,
checking that the pipes are properly positioned in the
recipient, so that to avoid inhaling air or spilling the
liquid into the
vessel.
8.
Shut the plant off and connect the original pipes taking
care of not empty the system daring out the solution.
HYDRAULIC SCHEME FOR
WINTERIZING PROCEDURE
FIG. 6-2
ATTENTION
It is necessary to perform the first start-up procedure when restarting the plant after a shutdown
procedure, in order to purge the air and drain out board the chemicals in the systems.
Before proceeding with any kind of service it is strongly recommended to read carefully the instruction
contained in this manual.
