单选题A cargo tank that is initially gas freed，can be inerted by introducing inert gas by a process known as（）.A dilutionB displacementC precipitationD Either A or B

How does an inert gas system on a tanker function to prevent explosions in cargo tanks?

A.De-energizes the "charged mist" effect

B.Maintains a positive pressure on the vent header to cool the flammable vapors

C.Inert gas filters out the flammable vapors from the cargo tank spaces

D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit

The purpose of inert gas systems aboard tank vessels is to ______.

A.allow sufficient oxygen in the tank to sustain life

B.prevent outside air from entering the tank

C.provide increase in cargo discharge pressure

D.comply with double hull pollution prevention regulations

An inert gas system installed on a tanker is designed to ______.

A.aid in the stripping and cleaning of cargo tanks

B.increase the rate of discharge of cargo

C.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere

D.lower the oxygen levels inside cargo tanks，making explosion nearly impossible

______ shall be provided in every cargo tank and slop tank in accordance with the appropriate Resolutions．

A.A load on top system

B.Direct line system

C.Circle line system

D.An inert gas system

Which method is used to supply inert gas from a flue gas system to the cargo tanks?

A.Exhaust gas pressure from the stack

B.High capacity fan

C.Inert gas compressor

D.Natural aspiration

A cargo tank that is initially gas freed，can be inerted by introducing inert gas by a process known as ______.

A.dilution

B.displacement

C.precipitation

D.Either A or B

Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?

A.The tank must be gas freed

B.The tank must be ballasted

C.The tank must be vented to the atmosphere

D.The bypass valve must also be closed

An inert gas system on a tanker should be used to ______.

A.prevent the generation of flammable or combustible gas in tanks

B.blow out cargo lines to prevent the build up of gas concentrations

C.dilute tank atmospheres to keep gas concentrations below the lower explosive limit

D.prevent fires in the pumproom by continually displacing flammable vapors

You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take?

A.Cut in another IG fan to increase gas flow

B.Open the pressure control valve until the pressure increases

C.Open the tank isolation valve to the fully open position

D.Reduce the pumping rate

Inerting means ______．

A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume

B.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume

C.The introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo

D.All of the above