6.3.6.6
Safety filter (1F03)
The safety filter is a full flow duplex type filter with steel net. This safety filter must be installed
as close as possible to the engines. The safety filter should be equipped with a heating jacket.
In multiple engine installations it is possible to have a one common safety filter for all engines.
The diameter of the pipe between the safety filter and the engine should be the same as
between the feeder/booster unit and the safety filter.
Design data:
according to fuel specification
Fuel viscosity
150°C
Design temperature
Equal to circulation pump capacity
Design flow
1.6 MPa (16 bar)
Design pressure
37
μ
m (absolute mesh size)
Fineness
Maximum permitted pressure drops at 14 cSt:
20 kPa (0.2 bar)
- clean filter
80 kPa (0.8 bar)
- alarm
6.3.6.7
Overflow valve, HFO (1V05)
When several engines are connected to the same feeder/booster unit an overflow valve is
needed between the feed line and the return line. The overflow valve limits the maximum
pressure in the feed line, when the fuel lines to a parallel engine are closed for maintenance
purposes.
The overflow valve should be dimensioned to secure a stable pressure over the whole operating
range.
Design data:
Equal to circulation pump (1P06)
Capacity
1.6 MPa (16 bar)
Design pressure
150°C
Design temperature
0.1...0.2 MPa (1...2 bar)
Set-point (
Δ
p)
6.3.6.8
Pressure control valve (1V04)
The pressure control valve increases the pressure in the return line so that the required pressure
at the engine is achieved. This valve is needed in installations where the engine is equipped
with an adjustable throttle valve in the return fuel line of the engine.
The adjustment of the adjustable throttle valve on the engine should be carried out after the
pressure control valve (1V04) has been adjusted. The adjustment must be tested in different
loading situations including the cases with one or more of the engines being in stand-by mode.
If the main engine is connected to the same feeder/booster unit the circulation/temperatures
must also be checked with and without the main engine being in operation.
Wärtsilä 20 Product Guide - a13 - 6 September 2016
6-29
6. Fuel Oil System
Wärtsilä 20 Product Guide
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