🔍 Key Concepts

• Difference between cartridge‑operated vs. self‑contained / stored‑pressure extinguishers • Which types require special equipment and gas to recharge safely • How often ship’s crew can safely service or top off certain extinguishers on board

💭 Think About

• Think about which extinguisher type needs specialized gas cylinders or high‑pressure equipment that you would not normally have on board a vessel • Ask yourself: which of these can the crew reasonably refill with water or powder, and which one involves handling high‑pressure compressed gas? • Consider which extinguishers are usually replaced or sent ashore when discharged, instead of being refilled by the crew

✅ Before You Answer

• Identify which option uses high‑pressure compressed gas that typically needs a shore facility to recharge • Identify which options can be opened, refilled, and re‑cartridged by crew with minimal equipment • Eliminate any extinguisher types that can be safely topped up with water by the crew using simple tools