Wartsila 46F - Page 82

a multiple engine installation, two flow meters per engine are to be installed: one in the feed
line and one in the return line of each engine.
There should be a by-pass line around the consumption meter, which opens automatically in
case of excessive pressure drop.
If the consumption meter is provided with a prefilter, an alarm for high pressure difference
across the filter is recommended.
De-aeration tank, booster unit (1T08)
It shall be equipped with a low level alarm switch and a vent valve. The vent pipe should, if
possible, be led downwards, e.g. to the overflow tank. The tank must be insulated and equipped
with a heating coil. The volume of the tank should be at least 100 l.
Circulation pump, booster unit (1P06)
The purpose of this pump is to circulate the fuel in the system and to maintain the required
pressure at the injection pumps, for single-engine circuit, or before circulation pumps (1P12)
for multi-engines circuit. Pressure is stated in the chapter Technical data. By circulating the
fuel in the system it also maintains correct viscosity, and keeps the piping and the injection
pumps at operating temperature.
Design data:
Capacity:
LFO:2cSt HFO:20cSt: See chapter "Technical data"
- single engine, without circulation pumps
(1P12)
15% more than total capacity of all circulation pumps- with circulation pumps (1P12)
Frequency Converter:
Not needed
- HFO single engine, without circulation
pumps (1P12)
Required
- Bi-fuel single engine, without circulation
pumps (1P12)
Not needed on 1P06- with circulation pumps (1P12)
1.6 MPa (16 bar)Design pressure:
1.0 MPa with 1P12
1.2 MPa without 1P12
Max. total pressure (safety valve)
150°CDesign temperature
500cStViscosity for dimensioning of electric motor
When more than two engines are connected to the same feeder/booster unit, individual
circulation pumps (1P12) must be installed before each engine.
Design data:
Capacity:
3 x the total consumption of the connected engines- without circulation pumps (1P12)
15% more than total capacity of all circulation pumps- with circulation pumps (1P12)
1.6 MPa (16 bar)Design pressure
1.0 MPa (10 bar)Max. total pressure (safety valve)
150°CDesign temperature
6-26 DAAB605814
Wärtsilä 46F Product Guide6. Fuel Oil System