•
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
.
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
.
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
