•
Closes the shut-off valves (CV7285C, CV7291C, CV7292C).
•
Opens the vent valves (CV7289C, CV7286C, CV7287C).
•
Opens the pressure regulating valve (CV7288C).
NOTE: The pressure in the engine gas piping decreases to atmospheric pressure.
If there is a usual gas trip and the ECS parameter “vent valve active mode” is OFF, or if there is
a gas trip with automatic inerting request, or if there is an engine shutdown, the iGPR control
system automatically starts the steps that follow:
•
Closes the shut-off valves (CV7285C, CV7291C, CV7292C).
•
Opens the vent valves (CV7289C, CV7286C, CV7287C).
•
Opens the pressure regulating valve (CV7288C).
•
Closes the master shut-off valve of the FGSS (controlled by PCS).
•
Opens the vent valve of the FGSS (controlled by PCS).
NOTE: The pressure in the engine gas piping and in the iGPR decreases to atmospheric
pressure (degassing state).
•
If there is a gas trip with automatic inerting request, the iGPR control system starts the
automatic inerting sequence, refer to Para 6.3.5.
6.3.4 Gas trip with automatic inerting
A gas trip with automatic inerting is necessary in the conditions that follow:
•
Emergency gas trip switches are active
•
Gas trip from gas detection system is active
•
Incorrect gas inlet conditions
•
Ventilation failure of the double wall pipes.
In these conditions the iGPR control system automatically starts the steps that follow:
•
Closes the master shut-off valve of the FGSS.
•
Opens the vent valve of the FGSS.
•
Closes the shut-off valves (CV7285C, CV7291C, CV7292C).
•
Opens the vent valves (CV7289C, CV7286C, CV7287C).
•
Opens the pressure regulating valve (CV7288C).
NOTE: The pressure in the engine gas piping and in the iGPR decreases to atmospheric
pressure.
The automatic inerting sequence then starts, refer to Para 6.3.5.
6.3.5 Automatic inerting sequence
The automatic inerting sequence has the steps that follow:
•
The engine safety system (ESS) sends a signal to the iGPR control system.
•
The iGPR control system opens the inert valve in the FGSS.
•
Inert gas flows through the pipes from the inert valve in the FGSS to the inert gas release
outlet of the engine.
X72-B
AA00-8904-00AAA-043A-A
Operation Manual Integrated gas pressure regulation
Winterthur Gas & Diesel Ltd.
- 238 - Issue 003 2021-12
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