Inerting means ______．A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume

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

______ 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

The use of portable electrical equipment in the pumproom on tank barges is prohibited unless ______．

A.The pumproom is gas-free

B.Spaces with bulkheads common to the pumproom are either gas-free，inert，filled with water，or contain grade E liquid

C.All other compartments in which flammable vapors and gases may exist are closed and secured

D.All of the above

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 loading

B.be gas-freed after loading operations

C.not be maintained in an inert condition

D.be maintained in an inert condition

Which statement about inert gas pressures in a cargo tank is TRUE ________．

A.The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging

B.Gas pressures should be maintained at the highest permissible level throughout the discharging process

C.High gas pressures may cause pyrophoric oxidation in the tank

D.High gas pressures may cause loss of suction when stripping

An inert gas system is designed to reduce the possibility of tank explosions by ______.

A.eliminating sparks and fire in the vicinity of cargo tanks

B.removing all hydrocarbon gases from the cargo tanks

C.blanketing cargo tanks with inert foam

D.reducing the oxygen concentration below levels necessary for combustion

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

Before discharge of cargo tank ballast is undertaken，______．

A.the deck isolating valve is open

B.flue gas isolating valve

C.blower suction valve

D.blower discharge valve

What is NOT a requirement for the safe and effective use of a crude oil washing system ________．

A.Strip all tanks and remove the bottom residue

B.Use an inert gas system while washing tanks

C.Use portable washing machines to reach areas obscured by structural members in the tanks

D.Debottom the tank used as the source for the tank cleaning machines

When a tank is to be gas freed after washing，the concentration of hydrocarbon vapour should be reduced by purging the inerted cargo tank with ______．

A.the oxygen

B.the gas

C.the inert gas

D.the hydrocarbon vapour

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