In the event of total failure of the inert gas system to
deliver the required quality and quantity of inert gas and maintain
a positive pressure in the cargo tanks and slop tanks, action must
be taken immediately to prevent any air being drawn into the tank.
All cargo tank operations should be stopped, the deck isolating valve
should be closed, and the vent between it and the gas pressure regulating
valve should be opened and immediate action should be taken to repair
the inert gas system.