What is the required gas supply capacity of...

🔍 Key Concepts

• Inert gas systems are designed to safely blanket cargo tanks during cargo operations • The required gas supply capacity is linked to the operation that can most rapidly change the tank atmosphere • Think about which shipboard rate (fan, draft, pump, or shore loading) directly controls how fast hydrocarbon vapors are displaced in the tanks

💭 Think About

• When loading or discharging cargo, which flow rate actually determines how quickly tanks are filled or emptied? • Which of the listed rates is set by the terminal/ship interface and is critical for keeping tank oxygen content below the limit at all times? • If the inert gas supply was sized only to match one of these rates exactly (100%), what risk would exist during peak or fluctuating operations?

✅ Before You Answer

• Identify which option refers to the maximum cargo transfer rate that the ship must be able to safely match with inert gas • Confirm which rate is external/operational, not just a machinery rating like fan or draft capacity • Verify that the chosen option would ensure positive pressure and low oxygen in all cargo tanks during the fastest expected cargo operation

What is the required gas supply capacity of an inert gas system?

125% of fan capacity

125% of forced draft rate

125% of cargo pump capacity

125% of shore side loading rate

🔍 Key Concepts

💭 Think About

✅ Before You Answer