Tanker Familiarization Cargo Handling and Operations 2

Question 1

What is the primary purpose of an inert gas system on a tanker?

Accepted Answer

To prevent explosive mixtures from forming in cargo tanks

Answer

Inert gas systems replace oxygen in cargo tanks with inert gas (typically flue gas or nitrogen) to keep oxygen levels below 8% and prevent flammable or explosive mixtures.

Question 2

When loading a tanker, what does the term 'ullage' refer to?

Accepted Answer

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

Answer

Ullage is the unfilled space in a cargo tank, measured as the distance from the tank top or reference point down to the surface of the liquid.

Question 3

Which valve type is typically used as the primary isolation valve on a tanker's cargo manifold?

Accepted Answer

Butterfly valve

Answer

Butterfly valves are commonly used on cargo manifolds because they are compact, quick-acting, and provide reliable shut-off with low pressure drop.

Question 4

During cargo discharge, what is 'stripping' on a tanker?

Accepted Answer

Pumping out the last remaining cargo using a stripping system

Answer

Stripping is the process of removing the last quantities of cargo that the main cargo pump cannot handle, using a separate smaller stripping pump or eductor.

Question 5

What is the significance of the 'closed gauging' method on a tanker?

Accepted Answer

It allows gauging without opening the tank, preventing vapor release

Answer

Closed gauging uses fixed gauging devices that allow tank contents to be measured without opening the tank, which prevents release of hazardous vapors and maintains the inert condition.

Tanker Familiarization Practice Test

Tanker Familiarization Practice Test

Tanker Familiarization Cargo Handling and Operations 2