🔍 Key Concepts

• Types of fire extinguishers commonly found on ships: stored-pressure vs cartridge-operated vs self-contained gas (CO₂) • What is required to "recharge" an extinguisher: refilling agent, pressurizing gas source, and service equipment • Which extinguishers are usually serviced ashore by specialists rather than by ship’s crew at sea

💭 Think About

• Think about which extinguisher type needs special filling and weighing equipment that most vessels do NOT have onboard • Consider which extinguishers are usually sent to a shore facility during annual or periodic servicing, instead of being opened and refilled by the crew • Ask yourself: which one is essentially a sealed, high‑pressure unit where the crew normally only checks weight and condition, not refill it?

✅ Before You Answer

• Identify which extinguishers depend on high‑pressure gas cylinders that require special charging equipment • Check which types are designed so crew can open, refill agent, and insert/replace a cartridge using tools already on board • Verify from your training materials which extinguisher type is typically weighed and replaced, not opened and refilled, during shipboard inspections