What is the second step in the shut-down procedure for a centrifugal feed water pump?

The second step in the shut-down procedure for a centrifugal feed water pump emphasizes the importance of closing the suction valve. After the pump is powered down, closing the suction valve prevents any additional water from entering the pump while it is no longer operational. This action is critical for ensuring the pump is completely isolated from the water source. It helps to prevent backflow and protects the integrity of the pump and associated piping system during maintenance or when the pump is being taken out of service.

Additionally, this step is typically performed after ensuring that other safety protocols, such as releasing pressure or previous lock-out/tag-out measures, have been taken. This order of operations is designed to maximize safety and operational integrity in the shut-down procedure. Understanding this sequence is vital for those who are tasked with the maintenance and supervision of fire alarm and related systems since improper shut-down could lead to equipment damage or unsafe working conditions.