Each inert gas system gas main must have an automatic shut d

Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system ________．

A.Cools the inert gas

B.Maintains the oxygen content at 5% by volume

C.Drains off static electricity in the inert gas

D.Maintains the water seal on the gas main

The blowers of an inert gas generation system aboard a tanker，will be automatically secured if ______．

A.Normal water supply at the water seal is lost

B.The temperature of the inert gas being delivered to the cargo tanks is more than 150℉

C.The cooling water supply to the scrubbers is lost

D.All of the above

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

You are planning to use a crude oil washing system．What precaution must be taken with the tank as the source for the washing machines ________．

A.It must be debottomed and the level lowered by at least one meter

B.The oil in the source tank must be sampled for compatibility

C.The source tank must have been crude oil washed at least once in the past 150 days

D.The inert gas system must lower the oxygen content to a maximum of 12% oxygen in the tank

The fresh air intake of the inert gas system ______，

A.Prevents the flue gas from falling below 3% content of oxygen

B.Allows the inert gas piping to be used for gas freeing the tanks

C.Opens when there is excessive vacuum on the deck water seal

D.Enables outside air to mix with and cool hot flue gasses

After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning ________．

A.Scrubber

B.Demister

C.Deck water seal

D.Final filter

The deck water seal of the inert gas system ______．

A.Cools the inert gas and prevents soot from entering the cargo tanks

B.Acts as an emergency shutdown when inlet pressures exceed the safe working pressure

C.Prevents the backflow of hydrocarbon gasses into nonhazardous areas

D.Relieves sudden large overpressures in the 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

What is the major function of the deck water seal in an inert gas system ________．

A.Relieve excessive overpressures in the system

B.Isolate hazardous from nonhazardous areas

C.Prevent the flow of inert gas into closed tanks

D.Remove any leftover water or soot after the gas has been scrubbed

Which statement about the inert gas system is TRUE ________．

A.Boiler soot blowers should never be used when the IG system is operating

B.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very light

C.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very light

D.Flue gas with excessive oxygen content is de-oxygenated in the scrubber