Tanker Familiarization Tanker Systems and Equipment 2

Question 1

What is the primary purpose of a tanker's inert gas system (IGS)?

Accepted Answer

To maintain a non-flammable atmosphere in cargo tanks

Answer

The IGS replaces oxygen in cargo tanks with inert gas (typically flue gas or nitrogen) to keep the atmosphere below the flammable range, preventing explosions.

Question 2

Which valve type is most commonly used as a master isolation valve on a tanker's cargo manifold?

Accepted Answer

Gate valve

Answer

Gate valves are preferred at cargo manifolds because they provide full-bore flow with minimal pressure drop when fully open.

Question 3

On a product tanker, what does a 'deep-well pump' refer to?

Accepted Answer

A submersible pump mounted inside the cargo tank

Answer

A deep-well pump is a submersible electric pump installed inside the cargo tank, eliminating the need for a separate pump room.

Question 4

What is the function of a pressure/vacuum (P/V) valve on a cargo tank?

Accepted Answer

To protect the tank from overpressure or excessive vacuum

Answer

P/V valves automatically open to vent excess pressure or admit air/gas when a vacuum develops, protecting tank structural integrity.

Question 5

What material is typically used for cargo hoses when transferring petroleum products to prevent static buildup?

Accepted Answer

Electrically bonded hoses with a conductive wire

Answer

Electrically bonded cargo hoses contain an embedded conductive wire to dissipate static electricity and prevent spark discharge during transfer.

Tanker Familiarization Practice Test

Tanker Familiarization Practice Test

Tanker Familiarization Tanker Systems and Equipment 2