Which action must be taken when an individual cargo tank is

Which step is NOT generally taken when gas-freeing a tank? ______.

A.Washing the tank interior with sea water

B.Application of degreasing solvents

C.Removal of corrosion products and sludge

D.Fresh air ventilation

The fitting at the end of a cargo line in a tank that allows suction to be taken close to the bottom of a tank is a ______．

A.Suction end

B.Strainer

C.Bell-mouth

D.Vacuum valve

You are carrying triethylamine，methyl methacrylate and isoprene in your multiple-product tanker. Which of the following statements is true?

A.Isoprene may be carried in a cargo tank adjacent to either of the other two cargoes

B.Methyl methacrylate may not be carried in a tank adjacent to a pump room

C.Methyl methacrylate must usually be heated to maintain its stability

D.Portable thermometers are not permitted to be used to take the cargo temperature of triethylamine

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

You are on a tanker designed to carry molten sulfur．Which statement is TRUE ________．

A.There must be two portable toxic vapor detectors on board

B.The cargo tank ventilation system must maintain the H2S vapor concentration at 1.85% or more by volume

C.Cargo temperature may be taken by portable thermometers

D.The pressure in the heating coils in the tanks must be less than that of the cargo exerted on them

By regulation，cargo tank atmosphere must be inert before and during which operation ________．

A.Stripping

B.Loading

C.Cleaning

D.All of the above

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

You are on a cargo vessel carrying toluol in bulk in portable tanks. Which is a requirement for pumping the toluol?

A.Hose connections to the tank must be made with a minimum of three bolts

B.There must be water pressure on the fire main

C.You must shut down if another vessel comes alongside

D.If transferring at anchor，you must display a red flag by day and a red light at night

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