🔍 Key Concepts

• 46 CFR fire protection regulations for cargo and passenger vessels • Purpose of fire main cut out (isolation) valves in an emergency • How freezing conditions affect water-filled piping systems on ships

💭 Think About

• Think about why the Coast Guard wants fire main isolation valves sealed open. What problem are they trying to prevent in an emergency? • Under what special condition would it be more dangerous to leave the fire main filled and pressurized? • Which option describes a temporary condition that might require you to change the normal position of the valve?

✅ Before You Answer

• Verify which 46 CFR section discusses fire main cut out valves and their normal operating position. • Check which choice involves a condition that could damage the fire main piping if left full of water. • Make sure the condition you pick is something that would be authorized by regulation, not just a routine operating situation.