By regulation，cargo tank atmosphere must be inert before and during which operation ________．A.StrippingB.LoadingC.CleaningD.All of the above

______ 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

What is the purpose of pressure-vacuum relief valves ________．

A.Regulation of discharge pressure from cargo pumps

B.Maintaining constant velocity in cargo lines

C.Regulation of suction head on cargo pumps

D.To maintain a tank or void at atmospheric pressure

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

Which statement is TRUE concerning cargo hose on tank barges ________．

A.Cargo hose must be able to withstand the shut-off head plus the static head of the cargo pump

B.Cargo hose must be able to withstand the static head of the cargo pump but no less than 100 psi

C.Cargo hose must be able to withstand the shut-off head less the static head of the cargo pump but no less than 100 psi

D.Cargo hose must be able to withstand at least 150 psi

Your tanker is carrying a cargo of styrene．Which of the following is NOT a requirement for carriage of this cargo ________．

A.P/V valves with galvanized parts must be replaced

B.Authorization to carry styrene must be endorsed on the Certificate of Inspection

C.You must have a Certificate of Inhibition provided by the shipper

D.The cargo tank heating coils must be blanked off

By regulation，cargo tanks must be inert before and during what operation?

A.Stripping

B.Loading

C.Cleaning

D.Crude oil washing

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

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

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

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