🔍 Key Concepts

• USCG fire extinguisher classification codes (letters and Roman numerals) • Difference between portable, semi-portable, and fixed fire extinguishing systems on cargo vessels • Minimum capacity/size associated with semi-portable fire extinguishers per 46 CFR

💭 Think About

• Look at how the letter (A, B, C) relates to the type of fire (ordinary combustibles, flammable liquids, electrical). Which type is most common for machinery and cargo spaces? • Consider the Roman numeral size rating (I, II, III, etc.). Which numerals are typically small enough to be carried by one person and which require a bracket or hose and are too large to be easily carried? • Think about where semi-portable extinguishers are installed and used on board. Which rating is usually found on a wheeled base or with a fixed hose connection near machinery spaces?

✅ Before You Answer

• Verify in 46 CFR Subchapter I (cargo and miscellaneous vessels) which extinguisher sizes are listed as portable and which as semi-portable • Check the minimum agent weight or volume for each classification (A-II, B-III, C-II) and compare their physical size and handling • Confirm whether the term semi-portable is tied more to the size rating (I, II, III) rather than the fire class letter (A, B, C)