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Oil Tankers. Test 13

Online Maritime Tests > Tests > Oil Tankers. Test 13

Oil Tankers. Test 13

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The most common valves used on an oil tanker are:

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Ball valves and discharging valves.
Gate valves, globe valves and butterfly valves.
Globe valves, suction valves and draining valves.
Butterfly valves and stripping valves.

What is the purpose of the deck water seal?

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To prevent combustion gases to flow back and enter the burner.
To wash the inert gas a second time.
To adjust the inert gas flow.
To supervise the inert gas pressure.

Which of these pumps is NOT a positive displacement pump?

Reciprocating.
Gear.
Rotary.
Centrifugal.

One of the following is NOT an alarm on an inert gas plant, which one?

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Low pressure alarm
Scrubber high water level alarm
Low oxygen alarm
Deck seal low water alarm

What is the required diameter of the crude oil washing lines, according to the ship

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To maintain the pressure.
To maintain the required pressure and flow to the machine in use.
No special requirement to the line dimension.
To maintain the flow.

Is slop tanks included in the total cargo capacity?

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Yes it is.
No, it is not.
Only on clean ballast tankers.
Only on segregated ballast tankers.

To supervise the pressure conditions in the cargo tanks, a special device is fitted for this purpose. What is it called?

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Tank atmosphere control valve.
Negative/positive pressure valve.
Supervising valve.
Pressure/vacuum valve.

If a vessel is fitted with

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That the vessel is only able to load on gravity.
A vessel without ordinary bottom lines where the cargo flows from tank to tank through bulkhead valves.
The vessel is not equipped with own discharging equipment.
That the cargo is free flowing in all tanks at all times.

According to the regulations in force, one of the following stripping devices is a demand on an oil tanker. Which one?

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Vacuum strip.
Ejector.
Not any particular.
Stripping pump.

What is the purpose with a expansion coupling?

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Used in case a pipe is too short.
To connect two pipes together.
Make the pipes capable to move back and forth inside the coupling.
To avoid the pipe expansion problems.

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