🔍 Key Concepts

• Cargo vessel fire main and hydrant requirements in 46 CFR (look for fire hose and hydrant standards) • Standard fire hose diameters commonly used on commercial vessels • Why fire hydrant outlets need to match standard hose coupling sizes used with shipboard and shoreside firefighting equipment

💭 Think About

• Which of these sizes is a common standard coupling size used in firefighting (both ashore and afloat)? • If one standard is 1-1/2 inches, what larger standard size is typically paired with it on fire mains and hydrants? • Think about practical use: which size would allow connection of standard fire hoses and nozzles without special adapters?

✅ Before You Answer

• Verify which sizes are commonly listed in 46 CFR or standard firefighting equipment tables for hose connections. • Eliminate any choices that are unusually small or unusually large for a ship’s fixed fire main hydrant connection. • Make sure your choice is a size that realistically matches common fire hose couplings used by ship and port firefighters.