During routine inspection of a vessel’s CO2 fire fighting system it was noticed that the engine room CO2 isolating valve remained in the closed position when the valve handle was manually operated. This was evident by the position of the valve spindle which remained in the closed position whilst the handle showed that the valve was open.
The isolating valve was removed, freed up and the handle was repaired and tightened. During this repair process the safety pins for the CO2 bottles were put in place and removed once the repair was completed.
In the event of a fire and the need for CO2 flooding, the isolating valve handle would have been forced to the open position, whilst the valve itself would have remained shut, thereby disabling CO 2 flooding.
Ensure that these CO2 isolating valves open and that it is not just the handles turning on the valve spindles.
During maintenance check that this valve is operating correctly when the inspection is done on the CO2 system.