An inert gas system installed on a tanker is designed to ______.A.aid in the stripping and cleaning of cargo tanksB.increase the rate of discharge of cargoC.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphereD.lower the oxy

Provides for faster loading

Lowers oxygen content in the tank

Provides better fuel economy

All of the above

prevents the flue gas from falling below 3% content of oxygen

allows the inert gas piping to be used for gas freeing the tanks

opens when there is excessive vacuum on the deck water seal

enables outside air to mix with and cool hot flue gasses

cools the inert gas and prevents soot from entering the cargo tanks

acts as an emergency system shutdown when the inlet pressures exceed the safe working pressure in the hazardous zone

prevents the backflow of hydrocarbon gasses into nonhazardous areas

relieves sudden large overpressures in the system

A flammable gas detection system must be installed in each cargo pump room

Tanks may not be located on deck

Carriage of this cargo is authorized by issuance of an IMO Certificate

Aluminum and copper alloys are prohibited from being in valve parts in contact with the cargo

Exhaust gas pressure from the stack

High capacity fan

Inert gas compressor

Natural aspiration

flammable vapors from entering machinery space

flue gas escaping to atmosphere

inert gas escaping to atmosphere

air entering inert gas system

filter

cooler

scrubber

purifier

5% or less

10% or less

15% or less

20% or less

cools the inert gas and prevents soot from entering the cargo tanks

acts as an emergency shutdown when inlet pressures exceed the safe working pressure

prevents the backflow of hydrocarbon gasses into nonhazardous areas

relieves sudden large overpressures in the system

cargo pump failure

blower failure

deck seal low water level

low inert gas temperature

De-energizes the charged mist effect

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

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

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

Scrubber

Demister

Deck water seal

Final filter

eliminating sparks and fire in the vicinity of cargo tanks

removing all hydrocarbon gases from the cargo tanks

blanketing cargo tanks with inert foam

reducing the oxygen concentration below levels necessary for combustion

aid in the stripping and cleaning of cargo tanks

increase the rate of discharge of cargo

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

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

5%

8%

6%

3%

prevent the generation of flammable or combustible gas in tanks

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

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

prevent fires in the pumproom by continually displacing flammable vapors

prevent the generation of flammable or combustible gas in tanks

blow out cargo lines to prevent gas concentrations

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

prevent fires in the pumproom by continually displacing flammable vapors

normal water supply at the water seal is lost

the temperature of the inert gas being delivered to the cargo tanks is more than 150°F

the cooling water supply to the scrubbers is lost

all of the above