Aqua-Base XA221 Guía De Montaje Y De Mantenimiento página 17

88. CLEANING OF THE MEMBRANES (See Fig. 15p34)
In normal operating, the R/O membranes can be clogged by mineral and organic deposits which accumulate until they cause a
drop in fresh water production quality and quantity. The membranes should be cleaned each time the quantity or the quality of
the produced water changes excessively. Before proceeding with membranes cleaning check that the change in performances
has no other cause, such as:
- Low sea water temperature: refer to the temperature/production curve,
- Filter clogged, water system badly drained, leading to lack of water at the HP pump,
- Bad operating of the HP pump: leaks,...
- Pressure badly adjusted,
- Salinity cell clogged.
WARNING : Cleaning of the membranes can only be done when they are inside their pressure vessel. Never take a
membrane out of its pressure vessel.
1. Rinse the membranes as described in chapter 73.
2. Fill the auxiliary container with 10 litres of fresh water produced by the unit or dechlorinated mains water.
3. Prepare the Alkaline solution A : 752003-MC11 (See 752037-EXP10) by mixing in the auxiliary container.
WARNING: Alkaline cleaning solutions are aggressive and can cause burning. PROTECT YOUR EYES AND
HANDS DURING THIS OPERATION (gloves, goggles,.....).
4. Put the cleaning pipes (E) in the bucket and open the cleaning valve (8) to cleaning position.
5. Completely shut down the pressure regulating valve (7) by turning it clockwise. Close the valve (18).
6. Place the inlet valve (1) to Rinsing position.
7. Start up the unit by pressing on the green ON button (30), to establish a correct closed circuit cleaning flow.
WARNING: During the membranes cleaning operation, pressure should be reduced to minimum. Check, using
the gauge, that it doesn't exceed 3 bar.
8. Let the unit operate in this way in closed circuit during 15 minutes.
9. After this time, stop the unit by pressing on the red OFF button (31).
10. Empty the solution out of the bucket and clean it with fresh mains water.
11. Put the cleaning valve (8) in reject position.
12. Carry out membranes rinsing as described in chapter 73.
13. Fill the bucket with 10 litres of fresh water produced by the unit, or dechlorinated mains water.
14. Prepare the Acid solution B : 752003-MC3 (See 752037-EXP10) by mixing in the auxiliary container.
WARNING: Acid cleaning solutions are aggressive and can cause burning. PROTECT YOUR EYES AND
HANDS DURING THIS OPERATION (gloves, goggles,.....).
15. Put the cleaning valve (8) in cleaning position.
16. Completely shut down the pressure regulating valve (7) by turning it clockwise.
17. Place the inlet valve (1) to Rinsing position.
18. Start up the unit by pressing on the green ON button (30), to establish a correct closed circuit cleaning flow.
19. Let the unit operate in this way in closed circuit during 15 minutes.
20. After this time, stop the unit by pressing on the red OFF button (31).
21. Empty the solution out of the bucket and clean it with fresh mains water.
22. Put the cleaning valve (8) in reject position.
23. Carry out membranes rinsing as described in chapter 73.
WARNING: In case of long stopping, proceed with preservation operation (Chap. 74).
NOTA : Membranes cleaning can be done in the factory or by your agent in a more thorough way, on a specialised bench.
Contact your agent or the factory directly.
VERSION 01/07
AQUABASEXA221-222-223 FR-GB-ES 01-2007.doc
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