Test about Crude Oil Washing

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Правильні відповіді:
1

According to IMO the Manual has to be approved by the Administration. With regard to general practice who is giving the final approval of the Manual?

Ваша відповідь правильна:

The classification society.
2

Are we allowed to perform COW at sea?

Ваша відповідь правильна:

Yes, between discharge ports.
3

From how many or which one of the cargo pumps must it be possible to take “bleed-off” from main(s) for COW supply?

Ваша відповідь правильна:

From any one of the cargo pumps.
4

How many percent of the cargo tanks to be crude oil washed on rotational basis for sludge control during a 4 months period?

Ваша відповідь правильна:

Approximately 25 %.
5

How to avoid excessive electrostatic generation in the washing process due to the presence of water in the crude oil washing fluid?

Ваша відповідь правильна:

By discharge at least 1 metre from the tank before use as a source of washing fluid.
6

How to avoid vapour emission during filling of departure ballast (non SBT vessel)?

Ваша відповідь правильна:

By simultaneous ballasting and cargo discharge.
7

Water, that is put into a tank, which has been crude oil washed but not water washed shall be regarded as:

Ваша відповідь правильна:

Dirty ballast.
8

What are the requirements regarding experience for persons, who are intended to have particular responsibilities as defined in the Manual?

Ваша відповідь правильна:

They shall have, at least, 6 months experience on oil tankers, where they should have been involved in COW operation.
9

What is IMO’s requirement regarding the oxygen level in the tank before and during it is crude oil washed?

Правильну відповідь:

The oxygen level must not exceed 8 % by volume.

Ваша відповідь:

The oxygen level must not exceed 5 % by volume.
10

What is the difference between SBT-system and CBT-system?

Ваша відповідь правильна:

CBT-system can utilise cargo pumps/lines for ballast handling.
11

What is the dissolving effect dependent on?

Ваша відповідь правильна:

The type of oil.; The composition of the oil.; The temperature of the oil.
12

What is the maximum quantity of oil you are permitted to discharge into the sea from an “existing tanker”?

Ваша відповідь правильна:

1/15 000 of the total quantity of the cargo.
13

What is the minimum distance from the nearest land when you are pumping departure ballast overboard?

Ваша відповідь правильна:

50 nautical miles.
14

What is the purpose of the small diameter line?

Ваша відповідь правильна:

To discharge ashore the drainings form pumps and lines.
15

What is the requirement regarding arrangements for hand dipping the cargo tanks after COW?

Ваша відповідь правильна:

Arrangements in the aftermost portion of the tank and in 3 other suitable locations.
16

What is the requirement regarding capacity of inert gas plant?

Ваша відповідь правильна:

At least 125 % of the maximum discharge capacity.
17

What is the requirement regarding hydrant valves on the COW line?

Ваша відповідь правильна:

They must be blanked off.
18

What is the requirement regarding stripping system capacity when washing bottom of the cargo tanks?

Ваша відповідь правильна:

The stripping capacity must be 25 % more, than the total throughput of washing fluid.
19

What is the requirement to the number of drive units on vessels, equipped with tank washing machines, where the drive units are detachable?

Ваша відповідь правильна:

That no drive unit has to be shifted more than twice.
20

What kind of action must be taken in the event of total failure of the inert gas system during discharge/COW?

Ваша відповідь правильна:

Stop the discharge/COW.
21

What kind of action to be taken if an alternation affecting the crude oil washing system is made?

Ваша відповідь правильна:

Revise the Manual.
22

What requirements must the person in charge of COW operation meet with regard to the COW Manual?

Ваша відповідь правильна:

Be fully knowledgeable of the content of the Manual.
23

Where in the tank shall the oxygen level be determined before crude oil washing?

Ваша відповідь правильна:

1 metre from the deck and in the middle region of the ullage space.
24

Where shall the verification of submerged washing machines be recorded?

Ваша відповідь правильна:

In the Supplement 2 to the Oil Record Book.
25

Where should you record the crude oil washing after completion?

Ваша відповідь правильна:

Oil Record Book.
26

Who is signing the Ship/Shore Safety Checklist?

Ваша відповідь правильна:

Ship and Shore Representative.
27

Why is COW more efficient than water washing?

Ваша відповідь правильна:

Because of the dissolving property in crude.
28

Why was COW made compulsory?

Правильну відповідь:

To reduce pollution.

Ваша відповідь:

To reduce amount of sludge in cargo tanks.
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