12.1 Backflow of cargo gases
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12.1 Backflow of cargo gases

 To prevent the return of cargo gases or cargo from the tanks to the machinery spaces and boiler uptake, it is essential that an effective barrier is always present between these two areas. In addition to a nonreturn valve, a water seal and vent should be fitted on the deck main. It is of prime importance that these devices are properly maintained and correctly operated at all times.

An additional water seal is sometimes fitted at the bottom of the scrubber (see also 3.9.6).

Parent topic: 12 Some Safety Considerations with Inert Gas Systems
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