Alfa Laval PureBallast 135 Compact USCG, System Manual, Page: 28 / 412

Ballasting
2.2.4.1 Backflush
To keep the filter clean, it is automatically backflushed. The backflush is
performed during ongoing process without interrupting the ballasting process.
When a ballast operation is stopped, a backflush is performed before the
system comes to a full stop. The ballast water used for backflushing is
returned to the sea directly at the ballasting site.
Filter backflush
2.2.4.2 Ballast after treatment (CIP process)
After a ballast operation, a CIP (cleaning-in-place) process is performed to
clean the UV reactor. This process can either be performed immediately after
a ballast operation or started within 30 hours counted from when the process
was started. Note, that it is possible to perform new processes during these 30
hours.
We recommend that a CIP process is performed within the same ecological
zone or in international waters (200 nautical miles from the base line). This will
avoid untreated water from the UV reactor and the filter to enter a different
ecological zones.
The UV reactor and filter are rinsed with technical water / potable water. Then,
the UV reactor is filled with biodegradable CIP liquid, which is circulated for 2
minutes every 15 minutes during the 6 hours CIP process to remove scaling
from the quartz sleeves and UV sensor glass. After the cleaning is finished,
the UV reactor is filled with technical water / potable water to prevent scaling,
algae growth etc.
200000695-1-EN-GB 23
System description 2 EN