Wartsila ?31DF Series Product Manual page 119

Wärtsilä 31DF Product Guide
Design data:
Capacity
Design pressure
Max. total pressure (safety valve)
Design temperature
Viscosity for dimensioning of electric motor
Pressure control valve, booster unit (1V03)
The pressure control valve in the feeder/booster unit maintains the pressure in the de-aeration
tank by directing the surplus flow to the suction side of the feed pump.
Design data:
Capacity
Design pressure
Design temperature
Set-point
Automatic filter, booster unit (1F08)
It is recommended to select an automatic filter with a manually cleaned filter in the bypass
line. The automatic filter must be installed before the heater, between the feed pump and the
de-aeration tank, and it should be equipped with a heating jacket. Overheating (temperature
exceeding 100°C) is however to be prevented, and it must be possible to switch off the heating
for operation on MDF. The coarser by-pass filter is only intended for temporary use, while the
automatic filter is maintained.
Design data:
Fuel viscosity
Design temperature
Preheating
Design flow
Design pressure
Fineness:
- automatic filter
- by-pass filter
Maximum permitted pressure drops at 14 cSt:
- clean filter
- alarm
DBAE248994
Total consumption of the connected engines added with
the flush quantity of the automatic filter (1F08) and 15%
margin.
1.6 MPa (16 bar)
0.7 MPa (7 bar)
100°C
1000 cSt
Equal to feed pump
1.6 MPa (16 bar)
100°C
0.3...0.5 MPa (3...5 bar)
According to fuel specification
100°C
If fuel viscosity is higher than 25 cSt/100°C
Equal to feed pump capacity
1.6 MPa (16 bar)
6 μm (absolute mesh size)
(ß = 75, ISO16889)
20
25 μm (absolute mesh size)
(ß = 75, ISO16889)
40
20 kPa (0.2 bar)
80 kPa (0.8 bar)
6. Fuel Oil System
6-35