Tanker Familiarization Tanker Systems and Equipment 3

Question 1

What is the purpose of a crude oil washing (COW) system on a tanker?

Accepted Answer

To use cargo crude oil as a solvent to clean tank residues during discharge

Answer

To clean crew accommodations using crude oil solvents

Answer

To wash crude oil with seawater before delivery

Answer

To neutralize corrosive crude before loading

Question 2

A tanker's slop tank is used primarily to:

Accepted Answer

Collect tank washing water and oily residues

Answer

Store fresh water for crew use

Answer

Hold emergency bunker fuel

Answer

Balance the ship during loading

Question 3

Which component of the cargo pump system prevents reverse flow when the pump stops?

Accepted Answer

Non-return (check) valve

Answer

Strainer

Answer

Pressure gauge

Answer

Flow meter

Question 4

What does the term 'ullage' refer to in cargo measurement?

Accepted Answer

The distance from the liquid surface to the top of the tank

Answer

The total volume of cargo loaded

Answer

The weight of cargo per cubic meter

Answer

The temperature of cargo at the time of measurement

Question 5

On a tanker, what is the function of a 'vapor recovery system'?

Accepted Answer

To capture cargo vapors during loading for safe disposal or return to shore

Answer

To recover hydraulic fluid lost during pump operation

Answer

To recycle engine exhaust gases into the inert gas system

Answer

To separate water vapor from the ballast system

Question 6

What is the main hazard of a 'sloshing' cargo in a partially filled tank during rough weather?

Accepted Answer

Dynamic loads that can damage tank structure and affect vessel stability

Answer

Increased cargo temperature causing vaporization

Answer

Contamination of cargo by seawater ingress

Answer

Accelerated corrosion of the tank coating

Question 7

Which type of pump is most commonly used for stripping (removing the last traces of cargo from a tank)?

Accepted Answer

Jet pump (eductor)

Answer

Centrifugal pump

Answer

Reciprocating positive displacement pump

Answer

Axial flow pump