Which statement about inert gas pressures in...

Which statement about inert gas pressures in a cargo tank is TRUE?

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🔍 Key Concepts

• Inert gas system (IGS) purpose on tankers: keep oxygen content and pressure within safe limits to prevent explosions and air entry • Relationship between tank pressure, cargo pumps, and stripping operations during discharge • Why excessively high or low inert gas pressure can be hazardous or operationally problematic

💭 Think About

• Think about how the pressure of inert gas in the cargo tank affects the suction side of the cargo pump when the liquid level is very low (stripping stage). What happens if the back pressure on the pump is too high? • Consider the purpose of inert gas: is the goal to run at the maximum possible tank pressure, or just enough positive pressure to exclude air while allowing safe, efficient pumping? • Ask yourself which option describes a realistic operational limitation you might encounter at the discharge port when pumping ashore against a certain line pressure.

✅ Before You Answer

• Verify how IGS operating manuals and typical procedures describe recommended tank pressure ranges during discharge (usually a modest positive pressure, not the maximum permissible). • Check which options describe credible operational effects on pumps (suction, discharge pressure, and line back pressure) rather than chemical or combustion phenomena that are unlikely under inert conditions. • Confirm which choice is consistent with the basic safety objective: avoid over‑pressurizing tanks or lines while still maintaining enough inert gas pressure to prevent air ingress.

🔍 Key Concepts

💭 Think About

✅ Before You Answer