Fig 6-8 GVU Control Panel
6.5.6 Purging the fuel gas pipes (Inerting)
Use inert gas like nitrogen to replace the fuel gas in the fuel gas pipes. This process makes
sure that there is no gas leakage into the engine room and removes possible dangers.
If fuel gas is found in the GVU or between the annular space of the double wall pipes, then the
safety system automatically changes from gas mode to diesel mode. In addition, a valve (N2
Engine in Figure 6-9) opens automatically and lets pressurized inert gas flows into the fuel gas
pipes and through the open vent valves. This calibrated sequence replaces the volume in the
fuel gas pipes at least three times. This guarantees the removal of residual gas in the system.
Before maintenance on the engine or the GVU, it is necessary to purge the fuel gas pipes to do
the gas removal procedure. This will make sure that fuel gas does not flow into the engine
room. One more N2 valve is installed upstream of the GVU. This valve is for the removal of fuel
gas in the GVU. The operators do this procedure manually. For the pipes directly on the engine,
the procedure is the same.
For the detailed procedure, refer to the documentation of the GVU manufacturer.
X92DF
AA00-8014-00AAA-042A-A
Operation Manual Gas valve unit and external gas supply system
Winterthur Gas & Diesel Ltd.
- 282 - Issue 002 2020-08
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