🔍 Key Concepts

• Fixed CO2 fire-extinguishing systems operation and safety precautions • Dangers of re-entering a CO2-flooded space (machinery spaces in particular) • The proper sequence of actions when a machinery space fire is discovered

💭 Think About

• Think about what happens to the oxygen level inside a machinery space after CO2 is released. Is it safe to open the space quickly? • Consider whether CO2 systems are intended as a first response or a last resort. When would you choose to use portable/local systems instead? • Ask yourself what using water (spray, fog, or solid stream) in a machinery space might do to burning fuel or hot machinery surfaces.

✅ Before You Answer

• Verify the required waiting period before opening a machinery space after CO2 discharge in current regulations or company procedures • Check how training materials describe the priority and timing of using a fixed CO2 system in machinery spaces • Confirm whether water fog or spray can ever be appropriate in machinery-space fires involving fuel and machinery, versus a blanket statement that water must never be used