🔍 Key Concepts

• Cartridge-operated fire extinguisher design (separate gas cartridge vs stored-pressure type) • How the state of charge is normally checked on different extinguisher types (pressure gage vs weight/inspection) • What kinds of extinguishers are typically rechargeable aboard ship and how that is done

💭 Think About

• Look closely at the illustration: does this extinguisher show a pressure gage on the main body? If not, how would you tell if it is charged? • Notice the separate gas pressure cartridge on the side. What does that tell you about how this extinguisher is pressurized and what is in the large canister? • Think about whether ordinary ship’s forces can safely open, refill, and reseal this type of unit, or if it usually requires a shore-side service company.

✅ Before You Answer

• Verify from the picture whether there is any pressure gage shown on the extinguisher body • Identify what component actually holds the propellant gas (main cylinder or side cartridge) • Consider typical practice: which types of portable extinguishers are user‑serviceable/rechargeable on board versus those that must be sent ashore