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GENERATORS
4.3
Typical installation with electric generator
below the water line (fig. 5)
1
Sea intake
2
System general tap
3
Tap to drain system
4
Water filter
5
Anti-siphon valve
6
Barrel muffler
7
Silencer
8
Sea drainage nozzle
9
Generating set
10 Drainage
11 Water line
A - Tubes, internal diameter 50 mm
B - Tubes, internal diameter 15 mm
C - Clamps
4.4
Typical installation of electric generator with
"E/G" separator above (fig. 6) and below
(fig. 7) the water-line
References for figure 6:
1
Sea intake
2
General tap-water
3
Tap to drain system
4
Water filter
5
Electric generator
6
Barrel muffler
7
"E/G" Separator
8
Sea drainage nozzle
9
Silencer
10 Gas exhaust
11 Water line
References for figure 7:
1
Sea intake
2
General tap-water
3
Tap to drain system
4
Water filter
5
Anti-siphon valve
6
Barrel muffler
7
"E/G" Separator
8
Sea drainage nozzle
9
Silencer
10 Gas exhaust
11 Water line
12 Drainage
13 Anti-siphon valve
A - Tubes, inside diameter 50 mm, suitable for sea
water/exhaust gas.
B - Tubes, inside diameter 15 mm, suitable for sea
water.
C - Clamps.
D - Tubes, inside diameter 40 mm, suitable for exhaust
gas (Max 70 °C).
E - Tubes, inside diameter 25 mm, suitable for sea
water.
GB
The
correspond exactly. In order to have a better noise
damping it is recommended to adopt a silencer, on
the "D" tube, at the distance of 1 meter from the
"E/G" separator.
4.5
Components
The sea water intake system must
be separate from the one for the engines propelling
the boat.
1 - Direct sea intake 1/2"
If the unit is installed more than 1
metre above the water-line, a check valve should be
fitted after the sea intake (fig. 8, ref. 1) to prevent the
water circuit emptying when the motor is off. If this
empties, the rotor of the water pump might be damaged
during start up; for the same reason, when the unit is
first started up, the suction tube from the valve to the
pump should be filled manually.
2 - Ball tap (general) 1/2"
3 - Ball tap (drainage) 1/2"
This is used to drain the cooling system of the
electric generator for general maintenance or when a
long period of inactivity is expected.
4 - Water filter (can be inspected)
This must provide efficient protection for the cooling
circuit from the entrance of mud, sand and seaweed.
Rate of flow for IS 6.5 / 7.6 : 25-28 L/min.
The filter mesh should be very fine.
Mesh 2 - 470 micron is recommended, other sizes do
not give good filter performance.
5 - Anti-siphon valve: this is a valve that brings the
cooling circuit back to atmospheric pressure when
the motor is turned off, thus avoiding the formation of
siphons. It's use obligatory when the base of the
generator group is under the water line, and it
must be positioned at least 30 cm. above sea level.
(see fig. 11).
Anti-siphon valve must be inserted
between the inlet of the sea water pump and mixing
elbow as indicated in Fig. 11
The drainage duct of the anti-siphon valve must run
beneath the valve itself in order to prevent water
accumulating in the duct, which should always re-
main empty to allow air to pass through when the unit
is switched off. (see fig. 9)
It is recommended that the drainage pipe from the anti-
siphon valve be fed into the bilge, as small amounts of
water might be drained through it during normal operation.
The cooling circuit is connected to the heat exchanger
pipe fitting as shown in Figure 10.
- 18 -
IS 6.5 - 7.6
measurements
should
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