What is the first action to be taken after informing the client that the cold water system is being decommissioned?

• A. Isolate and reduce the system pressure
• B. Drain the entire system
• C. Notify the client of the shutdown duration
• D. Shut off electrical power to the pump

Answer: (A)

The first action is to isolate the cold water system and reduce its pressure. By shutting off the supply and depressurizing the line, you stop any water flow and reduce the risk of leaks, sprays, or water hammer as you proceed with decommissioning. Draining the entire system comes next, once the pressure is already released, so it's not the initial step. Notifying the client is important for coordination, and turning off electrical power to the pump may be part of the shutdown plan, but it should follow the hydraulic isolation to ensure safety.