Final answer:
Systems partially or fully out of service should have an OUT OF SERVICE tag placed on the main control valve, which serves as a critical safety measure to prevent the operation of unsafe equipment.
Step-by-step explanation:
The correct answer is option "OUT OF SERVICE" tag placed on the main control valve. This is a safety procedure in various industries where control valves play a critical role in the operation of machinery or facility systems.
When a system or part of it is not functioning properly or undergoing maintenance, an OUT OF SERVICE tag is used to alert workers and prevent the operation of potentially unsafe equipment.
It serves as a communication tool to enhance safety protocols and ensure that everyone is aware of the current status of the system or equipment. The tag is prominently displayed to prevent accidental usage until the system has been repaired and is fully operational again.
For example, in a chemical processing plant, an OUT OF SERVICE tag on a control valve would indicate to operators not to use that part of the process until the tag is removed, ensuring the safety of the personnel and the integrity of the plant operations.
The correct answer is option LOCK-OUT tag. When a system is partially or fully out of service, a lock-out tag is placed on the main control valve to indicate that it should not be operated. This tag serves as a safety precaution to prevent accidental or unauthorized operation of the system while maintenance or repairs are being conducted.