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
第1题:
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
第2题:
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
第3题:
You are planning to use the crude oil washing system on your tanker.What is required to prevent electrostatic buildup in the tanks ________.
A.The portable machines should be set at the proper drop for the first wash before the fixed machines are used
B.The tank used as the source for the tank cleaning machines should be debottomed for at least one meter
C.The inert gas system must reduce the oxygen content in the tank to at least 18%
D.The fixed machines must be operated simultaneously with the portable machines to equalize the electrostatic potential
第4题:
Which statement is TRUE concerning inert gas systems on tankers ________.
A.Flue gases from the ship's boilers are used in some systems
B.The gas is helium
C.Using the system accelerates the rusting of the tanks
D.All of the above
第5题:
Provides for faster loading
Lowers oxygen content in the tank
Provides better fuel economy
All of the above
第6题:
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
第7题:
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
第8题:
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
第9题:
Exhaust gas pressure from the stack
High capacity fan
Inert gas compressor
Natural aspiration
第10题:
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
第11题:
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
第12题:
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
第13题:
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
第14题:
Using an inert gas system on a tanker has which advantage(s)________.
A.Provides for faster loading
B.Lowers oxygen content in the tank
C.Provides better fuel economy
D.All of the above
第15题:
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
第16题:
cargo pump failure
blower failure
deck seal low water level
low inert gas temperature
第17题:
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
第18题:
Scrubber
Demister
Deck water seal
Final filter
第19题:
Cut in another IG fan to increase gas flow
Open the pressure control valve until the pressure increases
Open the tank isolation valve to the fully open position
Reduce the pumping rate
第20题:
prevents spark generation
removes combustible gases
determines the level of combustible gases
provides inert gas generation in crankcase
第21题:
flammable vapors from entering machinery space
flue gas escaping to atmosphere
inert gas escaping to atmosphere
air entering inert gas system
第22题:
filter
cooler
scrubber
purifier
第23题:
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