•
Starts step 1 (FGSS preparation):
○
Waits for the signal FGSS is ready.
NOTE:
All valves are in diesel operation position.
○
Activates the FGSS ready signal from PCS to iGPR.
•
Starts step 2 (automatic leakage test):
○
Activates the leakage test active signal from iGPR to PCS and ECS.
•
Pressurizes the iGPR piping.
•
Monitors the pressure drop in the iGPR piping.
○
Activates the leakage test OK signal from iGPR to PCS and ECS.
○
Deactivates the leakage test active signal from iGPR to PCS and ECS.
•
Starts step 3 (flushing):
○
Activates the flushing active signal from iGPR to PCS and ECS.
○
Opens the shut-off valve (CV7285C).
○
Closes the vent valve at the engine inlet (CV7289C).
○
Opens the pressure regulating valve (CV7288C).
○
Opens the shut-off valves (CV7291C, CV7292C) and the vent valves (CV7286C,
CV7287C).
○
Activates the flushing OK signal from iGPR to PCS and ECS.
○
Deactivates the flushing active signal from iGPR to PCS and ECS.
•
Starts step 4 (pressurization and stabilisation):
○
Activates the pressure stabilisation active signal from iGPR to PCS and ECS.
○
Closes the vent valves (CV7286C, CV7287C)
○
Starts the pressurization and stabilisation.
○
Activates the pressure stabilisation OK signal from iGPR to PCS and ECS.
○
Deactivates the pressure stabilisation active signal from iGPR to PCS and ECS.
○
Activates the transfer preparation OK signal from iGPR to PCS and ECS.
NOTE:
The ECS uses this signal to start the GAV operation.
NOTE:
If one of the transfer preparation steps is not successful, the iGPR control system
sends a gas trip signal to the PCS and ECS. Then the iGPR control system
changes to degassing state, refer to
.
6.3.2
Overpressure release state
The iGPR control system automatically starts the steps that follow, if the gas pressure is 0.5 bar
above the setpoint value:
•
Opens the vent valve (CV7289C) as long as necessary.
•
Controls the pressure regulating valve (CV7288C).
6.3.3
Shutdown on gas operation
The iGPR control system automatically starts different steps related to the conditions.
If you manually start a transfer to diesel operation (refer to section
[section not applicable for this
engine]
), or if there is a usual gas trip and the ECS parameter “vent valve active mode” is ON, the
iGPR control system automatically starts the steps that follow:
X72-B
AA00-8904-00AAA-043A-A
Operation Manual
Integrated gas pressure regulation
Winterthur Gas & Diesel Ltd.
- 237 -
Issue 003 2021-12
