Typical Installation Of Electric Generator With "E/G" Separator Above And Below The Water-Line; Components; Drainage System - Mase Generators IS 8 Installationshandbuch

GENERATORS
2.4. 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 exhaust
12 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 16 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.
WARNING
The measurements should correspond exactly.
In order to have a better noise damping it is recom-
mended to adopt a silencer, on the "D" tube, at the
distance of 1
"E/G" separator.
2.5

Components

WARNING
The sea water intake system must be separate from
the one for the engines propelling the boat.
1 - Direct sea intake 1/2"
- 14 -
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meter from the
GB
WARNING
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 8 / 9,5: 25-29L/min.
INFORMATION
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 genera-
tor group is under the water line, and it must be
positioned at least 30 cm. above sea level.
(see fig. 11).
WARNING
Anti-siphon valve must be inserted between the inlet
of the sea water pump and mixing elbow as indi-
cated 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
remain 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.
2.6

Drainage system

The flue gas/water drainage system of the generator must
be separate from that of the main motors
WARNING
The length of the tube from the highest point of the
drain duct to the muffler should not exceed 2 metres.
This is to prevent the water left in the drainage duct
IS 8 - 9.5 9 - 10.2