In setting the valves on a steam-smothering system on a tank

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

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

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?

A.The relief valves in the system should be readjusted

B.The filters and strainers should be checked frequently

C.All system pressure should be readjusted

D.The system should be drained and renewed with a fluid of different operating characteristics

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

Valves on steam-smothering lines to cargo tanks shall be set with ______．

A.The master control valve shut and valves to individual cargo tanks shut

B.The master control valve open and valves to individual cargo tanks shut

C.The master control valve shut and valves to individual cargo tanks open

D.All valves open

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

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?

A.With gooseneck vents

B.With warning signs

C.With flame screens

D.With pressure-vacuum relief valves

You have completed a crude oil wash．What action should be taken with the oil in the lines running to the washing machines ________．

A.Open a COW nozzle forward and one aft and drain the line into the after tank by gravity

B.Blow the line out using compressed air

C.Pull a suction using the supply line pump

D.Close off all valves in the system and leave the oil in the line primed for the next crude oil wash