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CHEMCO Exit Exam • Set 3 Question 17 of 30

The inert gas is delivered to the cargo tanks by an inert gas deck main line. Find the correct labelling for the deck equipment items,

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Direct Answer

Option C: 1-Cargo tank valves; 2- Pressure/Vacuum Valve; 3- Mast Riser; 4-Isolating Valve

In a typical inert gas deck system, the components are arranged as follows: 1-Cargo tank valves (for isolating individual tanks), 2-Pressure/Vacuum Valve (PV valve), 3-Mast Riser (for venting), and 4-Isolating Valve (main IG line shut-off).

All Options

A
1-Pressure/Vacuum Valve; 2- Cargo tank valves; 3- Mast Riser; 4-Isolating Valve
B
1-Mast Riser; 2-Isolating Valve; 3-Cargo tank valves ; 4- Pressure/Vacuum Valve
C
1-Cargo tank valves; 2- Pressure/Vacuum Valve; 3- Mast Riser; 4-Isolating Valve (Correct Answer)
D
1-Isolating Valve; 2- Pressure/Vacuum Valve; 3- Mast Riser; 4-Cargo tank valves

Detailed Explanation & Context

In a typical inert gas deck system, the components are arranged as follows: 1-Cargo tank valves (for isolating individual tanks), 2-Pressure/Vacuum Valve (PV valve), 3-Mast Riser (for venting), and 4-Isolating Valve (main IG line shut-off).

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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