Which combination of devices is used to positively hold an emergency isolation device?

• A. Padlock, Chain and Seal
• B. Combination or Key, Lockout and Tagout
• C. Push Button, Lever and Handle
• D. Valve, Handle and Lock

Answer: (B)

Positively isolating an emergency device is done by combining a lockout device with a key or combination lock and a tagout device. The lockout part physically prevents the device from being operated, so even if someone tries to move a valve or actuator, it can’t be turned or activated. The tagout part adds information—who placed the lock, why it’s in place, and when it was put on—so others know the device is out of service and why. Together, they ensure both actual isolation and clear, authorized control over when the device can be restored.

This pairing is why the option using a lockout method with a tagout is the best choice. Other options might involve locking or tamper-evidence, but they don’t consistently provide the formal tagging component that communicates the status and authorization, which is essential for safe maintenance of emergency isolation devices.