8 For a DF engine, stop the gas system.
8.1 If you have to do maintenance downstream of the block valve (CV7285), do as
follows:
8.1.1 Make sure that the valve positions are in degassing state.
8.1.2 On the iGPR cabinet switch the button S8 to maintenance to activate the
maintenance mode.
8.1.3 On the LDU-20 iGPR page, make sure that all conditions are satisfactory.
8.1.4 On the LDU-20 iGPR page, push the Engine Inerting button to start the
engine inerting sequence.
8.1.5 Make sure that the indication in progress shows on the LDU-20.
NOTE: The iGPR control system does the engine inerting sequence.
8.1.6 Wait until the indication passed shows on the LDU-20.
8.1.7 On the iGPR cabinet push the button S7 to degas the system.
8.2 If you have to do maintenance on a component downstream of the master shut-
off valve, do as follows:
8.2.1 Make sure that the valve positions are in degassing state.
8.2.2 On the iGPR cabinet switch the button S8 to maintenance to activate the
maintenance mode.
8.2.3 On the LDU-20 iGPR page, make sure that all conditions are satisfactory.
8.2.4 On the LDU-20 iGPR page, push the Supply Line Inerting button to start
the supply line inerting sequence.
8.2.5 Make sure that the indication in progress shows on the LDU-20.
NOTE: The iGPR control system does the supply line inerting sequence.
8.2.6 Wait until the indication passed shows on the LDU-20.
8.2.7 On the iGPR cabinet push the button S7 to degas the system.
9 For a DF engine, stop the pilot fuel supply to the engine as follows:
9.1 Stop the pilot fuel supply from the plant.
9.2 Close the shut-off valve at engine connection 76 (pilot fuel inlet).
9.3 Release the pressure in the pilot fuel system.
9.4 Drain the pilot fuel system.
9.5 Close the shut-off valve at engine connection 77 (pilot fuel return outlet).
X72-B
AA00-0000-00AAA-151B-A
Operation Manual Prepare the engine for standstill or for maintenance
Winterthur Gas & Diesel Ltd.
- 356 - Issue 003 2021-12
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