Wärtsilä Finland Oy
Power Plants
Doc id:
WDAAA299978 -
Date:
05-Nov-2003
Page:
14 (19)
Table I
Normal operation for fuel gas regulating unit. Normally the maximum inlet pressure to the
GRU is 6 bar g and optionally 16 bar g when regulating valve V07 is supplied with safety shut
off valve (SAV). In latter case, alarm and shut down are higher.
Alarm
Shut down
P03=inlet pressure
•
High:6.3 bar g
•
Option: 16.0 bar g
•
Low: 1.5
P06=after V07
•
In case of PS: -
•
In case of PT: High: 4.5 bar g
P03=inlet pressure
•
High: 7.2 bar g
•
Option: 16.8 bar g
•
Low: -
P06 = after V07
•
In case of PS: -
•
In case of PT: 5.0 bar g
7.2.2.1
Normal stop or shut down
Normal stop occurs when an intentional stop command is given for the engine to stop. Shut down occurs
when it is necessary to stop the engine to prevent any damage for the equipment. The action for fuel gas
regulating unit shut off valves and ventilating valves is identical for normal stop and shut down.
The shut-off valves in the fuel gas regulating unit are closed during a normal stop sequence. Gas venting is
done the following way:
1.
V14 is opened for 5 seconds to relieve the overpressure between V07 and V15.
2.
V16 is opened and will remain so
3.
V19 is opened normally for 30 seconds to relieve the overpressure between the fuel gas regulating
unit and the engine and after that the valve is closed to prevent air to get into the gas piping.
7.2.2.2
Emergency
An emergency mode will close the shut-off valves on the fuel gas regulating unit and open venting valves
V16 and V19 ventilating space between slam shut off valves and between fuel gas regulating unit and the
engine.
At the same time the gas valves on the engine will close and the ignition is deactivated.
7.2.2.3
Plant emergency
A plant emergency mode is like a local emergency mode for all engines.
A plant emergency mode is activated by:
•
a gas detector sensing 20 % of LEL (option)
•
a fire detector which is activated
•
from a common panel by pressing emergency button
In addition, the main shut off valve outside the engine room or engine cell will be closed automatically by
PLC.
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