I.S. 18 / 21 / 24 / 27 50
Hz
- 11
GB
GB
4.2.2 Typical installation with generator
below
the
water line (Fig.5)
1 Sea exhaust
2 Silencer
3 Exhaust
4 Water filter
5 Main system tap
6 Sea intake
7 Drain tap
8 Antisiphon valve
9 Drainage
A
- Pipes - inner diameter Ø75 mm.
B
- Pipes - inner diameter Ø25 mm.
C
- Pipes - inner diameter Ø16 mm.
D
- Pipes - inner diameter Ø14 mm.
4.4.3 Typical installation of generator with gas/
water separating exhaust type GENSEP
above the waterline (fig.6)
1 Sea exhaust - gas
2 Sea exhaust - water
3 Gas/water separating exhaust type GENSEP
4 VERNALIFT exhaust
5 Water filter
6 Main system tap
7 Sea intake
8 Drain tap
A
- Pipes - inner diameter Ø80 mm.
B
- Pipes - inner diameter Ø40 mm.
C
- Pipes - inner diameter Ø25 mm.
D
- Pipes - inner diameter Ø25 mm.
E
- Pipes - inner diameter Ø16 mm.
4.4.4 Typical installation of generator with gas/
water separating exhaust type GENSEP
below
the waterline (fig.7)
1 Sea exhaust - gas
2 Sea exhaust - water
3 Gas/water separating exhaust type GENSEP
4 VERNALIFT exhaust
5 Water filter
6 Main system tap
7 Sea intake
8 Drain tap
9 Antisiphon valve
10 Drainage
A
- Pipes - inner diameter Ø80 mm.
B
- Pipes - inner diameter Ø40 mm.
C
- Pipes - inner diameter Ø25 mm.
D
- Pipes - inner diameter Ø25 mm.
E
- Pipes - inner diameter Ø16 mm.
F
- Pipes - inner diameter Ø14 mm.
- It is very important to respect the distances shown in the
installation diagrams.
- The exhausts (ref.3 of fig.4 and 5 ) have the function of
collecting the water left in the exhaust pipes when the
generator engine is turned off and preventing that it flows
into the engine through the manifold and the exhaust
valve. For this reason it is essential to respect the
position of the exhaust and the length of the pipes as
indicated in the installation diagram.
4.3 Components
The seawater intake system must be independent of that
of the boat propulsion engines
1
- 1/2" direct seawater intake.
If the generator is installed at a height of over 1 m above the
water line, a non-return valve must be fitted after the
seawater intake (Fig.8, Ref.1) to prevent draining the water
circuit when the engine is off. If it is drained, the water pump
rotor may be damaged during starting; for the same reason,
when the generator is started for the first time, the intake
pipe must be filled manually from the valve to the pump.
2
- 1/2" ball cock (main system).
3
- 1/2" ball cock (system bleeding).
Serves to drain the cooling system of the generator for
general maintenance or for long periods of inactivity.
4
- Water filter (inspectable).
It must efficiently protect the cooling circuit against
inflow of mud, sand and seaweed.
Water flow rate IS 21.5-23.5: 40-45 l/min.
The filter mesh must be the fine type. It is recommended
to use the type with pitch 2 - 470 micron; different sizes
would not allow good filter efficiency.
5
- Antisiphon valve: This is a valve which pressurizes the
cooling circuit to atmospheric pressure when the
engine is off, preventing the siphonage phenomenon.
It must be used when the base of the generator
sits below the water line,
and must be positioned at
least 50 cm above sea level. (see Fig.5).
The antisiphon valve is inserted between the seawater
pump delivery and the mixer as shown in Fig.11.
The antisiphon valve drain pipe must run below it thus
preventing water from building up in the pipe, which must
always remain empty to allow air to pass through it when
the generator is switched off (see Fig.9).
It is recommended to lead the antisiphon valve drain pipe
into the bilge, since small amounts of water might seep
from it during normal operation.
The cooling circuit is connected to the heat exchanger
pipe fitting as shown in Figure 10.
