Provides for faster loading
Lowers oxygen content in the tank
Provides better fuel economy
All of the above
What is the major function of the deck water seal in an inert gas system ________．A.Relieve excessive overpressures in the systemB.Isolate hazardous from nonhazardous areasC.Prevent the flow of inert gas into closed tanksD.Remove any leftover water or soot after the gas has been scrubbed
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When a non-volatile cargo is carried in a tank that has not been previously gas freed，then that tank shall ______．A.be purged with hydrocarbon gas prior to loadingB.be gas-freed after loading operationsC.not be maintained in an inert conditionD.be maintained in an inert condition
Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
Which statement is TRUE concerning inert gas systems on tankers ________．A.Flue gases from the ship's boilers are used in some systemsB.The gas is heliumC.Using the system accelerates the rusting of the tanksD.All of the above
单选题Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.A cargo pump failureB blower failureC deck seal low water levelD low inert gas temperature
单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）A De-energizes the charged mist effectB Maintains a positive pressure on the vent header to cool the flammable vaporsC Inert gas filters out the flammable vapors from the cargo tank spacesD Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
单选题The fresh air intake of the inert gas system（）.A prevents the flue gas from falling below 3% content of oxygenB allows the inert gas piping to be used for gas freeing the tanksC opens when there is excessive vacuum on the deck water sealD enables outside air to mix with and cool hot flue gasses
