🔍 Key Concepts

• Tag-out/lock-out (T/O L/O) is used any time stored energy (pressure, electricity, motion) could unexpectedly start or release and injure personnel • Difference between routine operating actions and maintenance that requires isolation of a system • Hazards of moving machinery and stored pressure in machinery spaces

💭 Think About

• For each choice, ask: could this equipment start, move, or release stored energy unexpectedly while I work on it? • Which procedure would normally require you to isolate, secure, and positively prevent operation of the equipment, not just operate a valve or drain as part of normal watchstanding? • Is the action being performed something you could safely do while the equipment remains in service and energized, or does it require the equipment to be taken out of service?

✅ Before You Answer

• Identify which option involves exposure to internal moving parts or high stored energy during the work • Decide which task is beyond normal watchstanding/operating duties and is clearly a maintenance evolution that removes equipment from service • Consider whether ship’s safety procedures would require a written tag-out/lock-out before anyone could legally touch or open that component