During post-operation shutdown, which action should be performed with the discharge valve?

• A. Close discharge valve
• B. Leave discharge valve open
• C. Open hydrant
• D. Remove discharge hose

Answer: (A)

Closing the discharge valve is the correct action during post-operation shutdown because it isolates the pump from the discharge piping, preventing further flow and protecting the system from water hammer and backflow as the pump is shut down. With the valve closed, any residual pressure in the discharge line is contained and the pump and piping are safeguarded during shutdown. Leaving the discharge valve open would leave the discharge side pressurized and susceptible to backflow or accidental discharge if the system changes state. Opening a hydrant or removing the discharge hose are separate steps and do not address the need to isolate the pump’s discharge line during shutdown.