What is used for the isolation of affected compartments and systems?

• A. Compartment isolation lists/kill cards
• B. Isolation valves
• C. Lockout tags
• D. Drill schedules

Answer: (A)

Compartment isolation lists, often called kill cards, are the go-to reference for isolating affected compartments and systems. They provide the exact boundaries of what must be shut off, the sequence to follow, and the specific equipment involved. In a damage control situation, you need a concise, approved plan that tells you which spaces to isolate to halt the spread of damage (fire, flood, contamination) and to protect critical areas. This written directive standardizes actions across the crew, reducing guesswork and ensuring a coordinated, rapid response.

Isolation valves are the actual devices used to close off lines and seal spaces, so they implement the plan. Lockout tags help ensure safety by signaling that equipment is not to be operated while isolation is in progress, but they’re not the document that tells you what to isolate. Drill schedules relate to training and practice, not the real-time isolation guidance during an incident.

So, the best answer is the compartment isolation lists/kill cards—the document that directs exactly what to isolate and in what order.