If psi is yellow, what should you do?

• A. Change elements at once
• B. Change elements at the end of operation
• C. They are clean
• D. Inspect system

Answer: (B)

When alarm or indicator colors signal caution, the action is to plan the maintenance for a safe time and complete it during a shutdown. A yellow psi warning means you should prepare to service, but perform the actual element change after you’ve finished current operations and de-energized the system.

Replacing the elements at the end of operation is best because it requires depressurizing and securing the system. This minimizes risk to you from live pressure, reduces chances of leaking or contamination during flow, and allows a proper purge and safe access. Doing the change while the system is running could interrupt operation, create safety hazards, or spread contaminants.

The other ideas aren’t the recommended response here: the warning isn’t indicating the elements are already clean, and while inspecting the system is good practice, the specific action prompted by a yellow psi warning is to address the elements during shutdown. Changing elements immediately during operation would not align with the caution indicated by the yellow status.