1.6 MPa (16 bar)
Design pressure
37
μ
m (absolute mesh size)
Filter fineness
Maximum permitted pressure drops at 14 cSt:
20 kPa (0.2 bar)
- clean filter
80 kPa (0.8 bar)
- alarm
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
Pilot fuel feed pump, MDF (1P13)
The pilot fuel feed pump is needed in HFO installations. The pump feed the engine with MDF
fuel to the pilot fuel system. No HFO is allowed to enter the pilot fuel system.
It is recommended to use a screw pump as circulation pump. A suction strainer with a fineness
of 0.5 mm should be installed before each pump. There must be a positive static pressure of
about 30 kPa on the suction side of the pump.
Design data:
1 m
3
/h per engine
Capacity
1.6 MPa (16 bar)
Design pressure
1.0 MPa (10 bar)
Max. total pressure (safety valve)
see chapter "Technical Data"
Nominal pressure
50°C
Design temperature
90 cSt
Viscosity for dimensioning of electric
motor
Flushing
The external piping system must be thoroughly flushed before the engines are connected and
fuel is circulated through the engines. The piping system must have provisions for installation
of a temporary flushing filter.
The fuel pipes at the engine (connections 101 and 102) are disconnected and the supply and
return lines are connected with a temporary pipe or hose on the installation side. All filter
inserts are removed, except in the flushing filter of course. The automatic filter and the
viscosimeter should be bypassed to prevent damage. The fineness of the flushing filter should
be 35
μ
m or finer.
Wärtsilä 50DF Product Guide - a16 - 9 September 2016
6-43
6. Fuel System
Wärtsilä 50DF Product Guide
Summary of Contents for WARTSILA 50DF
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