Question 126 of 201 tasco Exam
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.
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
D 1-Isolating Valve; 2- Pressure/Vacuum Valve; 3- Mast Riser; 4-Cargo tank valves
Answer & Explanation
The correct answer is Option C: 1-Cargo tank valves; 2- Pressure/Vacuum Valve; 3- Mast Riser; 4-Isolating Valve.
The proper sequence for deck equipment in the IG distribution line is the cargo tank isolating valve, then the PV valve, followed by the mast riser and final isolating valves, ensuring pressure control and safety of the tank boundary.