Wärtsilä Finland Oy
Power Plants
Doc id:
WDAAA299978 -
Date:
05-Nov-2003
Page:
13 (19)
Main gas line
Pressure regulator
Shut-off valves
Control Air
GenSet
Figure 8
The flow chart of fuel gas regulating unit.
The gas pressure must always remain higher than the charge air pressure. There is a minimum and
maximum offset for the pressure difference. If the difference is outside the limits the engine will be shut
down.
Opening, closing and venting of the fuel gas regulating unit is electrically controlled through the PLC, while
the gas at the engine intake is regulated by solenoid valves controlled by WECS (Wärtsilä engine control
system).
The fuel gas regulating unit operates "fail safe", i.e. the shut-off valves are closed and the vent valves V16
and V19 are opened in the event of a loss of electricity. Table I shows the alarm and shut down limits for fuel
gas regulating unit.
