540
9
HYDRAULIC SYSTEMS
Studio ti 03312 540-04usa
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9.6 THRU-HULL FITTINGS AND INTAKE SEACOCK
The sea valves and the outer intake seacocks of the hull must be free
from barnacles, seaweed, corrosion or other obstructions. The intake
seacocks and valves must be kept clean, using a brush if necessary. As
this operation has to be performed from the outside of the hull, the yacht
should be in a dry shore. If necessary, the cleaning may be done
underwater by a diver, thus preventing anybody from starting the
engines.
9.6.1 Seawater cooling system check
Never leave water in the system when the yacht is out of water.
At least once a month, flush the seawater system with fresh water to
remove any scale that could clog the passages of the seawater cooling
circuit.
9.6.2 Maintenance of the sea filters
Clean the sea filter at regular intervals, according to the use of the system
and the level of pollution (seaweeds, jellyfish, other foreign matter, etc.)
in the water in which the yacht is operating.
Moving the valve handles repeatedly and regularly helps prevent sea
valves from becoming difficult to open or close.
Clean the intake seacock filters according to the frequency of the system
use and to the pollution condition of the sucked waters (seaweeds,
mucilages, etc.).
− Close the intake seacock valve concerned.
− Cut-off valves upstream of concerned filter.
− Loosen the filter cover.
− Remove the filter basket and wash away all impurities with fresh
water. Replace, if necessary.
− Reinstall the baskets and the cover.
− Open the valves upstream of concerned filter.
− Before restarting the system circuit, ensure that the screws and
relevant washers are correctly fastened with the ring and disc on
filter’s body.
− Re-open the intake seacock valve completely and check for leaks
presence from the filter cover.
All intake seacocks must always be fully open or fully closed, as needed.
Do not use the intake seacock in a partially open or partially closed
position.
If a valve handle is difficult to operate, you may use an extension on the
handle to increase leverage. However, the sea valve should be serviced
at the next dry-docking of the yacht to correct the problem.
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WARNING
During navigation check periodically the cleaning condition of the
seawater filters.
If the yacht is crossing a dirty sea area, check the strainers condition
and proceed with their cleaning.
This precaution is very important, to avoid damaging of mechanical
parts (like engines, generator, etc.), of the exhausts systems and to
prevent endangering the yacht safety.
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DANGER
The lack of care during the cleaning of the intake seacock filters can
cause heavy damages to the on board devices and in some cases fire,
with very serious consequences. Check before setting up for navigation
and at regular intervals also during navigation, the condition of the
intake seacock filters of the various devices.
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