Tanker Familiarization Emergency Procedures 3

Question 1

At what oxygen level in a confined space is the atmosphere considered immediately dangerous to life and health (IDLH) due to oxygen deficiency?

Accepted Answer

Below 19.5%

Answer

An atmosphere below 19.5% oxygen is considered oxygen-deficient and requires SCBA; below 16% causes impairment and below 6% is fatal very quickly.

Question 2

When an emergency shutdown (ESD) system is activated on a tanker during loading, which sequence is CORRECT?

Accepted Answer

Both ship and shore manifolds close simultaneously

Answer

A properly integrated ESD system closes both ship and shore manifolds simultaneously to prevent hose/arm stress from pressure surges.

Question 3

A tanker's cargo tank pressure gauge shows a sudden drop to below atmospheric. What emergency risk does this indicate?

Accepted Answer

Inert gas failure with potential air ingress and explosive mixture

Answer

Sub-atmospheric pressure in an inerted tank suggests inert gas system failure, allowing air ingress that could create an explosive mixture with hydrocarbon vapors.

Question 4

Which communication signal is used internationally to signal a ship is in distress and requires immediate assistance?

Accepted Answer

MAYDAY repeated three times on VHF Ch 16

Answer

MAYDAY is the internationally recognized voice distress signal indicating grave and imminent danger requiring immediate assistance.

Question 5

When using a CO2 fixed fire-fighting system in a tanker pump room, crew must ensure the space is evacuated because CO2:

Accepted Answer

Displaces oxygen, creating a lethal atmosphere for anyone inside

Answer

CO2 extinguishes fire by displacing oxygen below the level needed for combustion, which is the same level required for human survival.

Tanker Familiarization Practice Test

Tanker Familiarization Practice Test

Tanker Familiarization Emergency Procedures 3