🔍 Key Concepts

• Basic purpose of an inert gas system (IGS) on tankers – what it is protecting against • Which parameters are critical to safe IGS operation (gas composition, pressure, and water levels in key components) • The difference between alarms related to gas quality/pressure and alarms related to equipment protection (scrubber, deck seal, etc.)

💭 Think About

• Ask yourself: What is the main safety objective of an inert gas system – what conditions must it constantly monitor to keep cargo tanks non‑flammable? • Which components (scrubber, fans, deck seal, oxygen analyzer, pressure control) normally have built‑in level or pressure alarms to avoid damage or loss of system integrity? • Is there any option that sounds like a general tank‑environment safety alarm rather than a specific inert gas equipment alarm?

✅ Before You Answer

• Verify which parameter is always monitored in IGS to ensure the gas is truly inert (think percentage of oxygen). • Recall that the deck water seal and scrubber both involve water levels – which one(s) would logically need high or low water level alarms to prevent air backflow or equipment damage? • Confirm in IGS descriptions that system pressure is closely controlled and usually has both high and low pressure alarms to maintain safe delivery to cargo tanks.