When conducting a standard relay operation, which pumper should be shut down first after completion?

In a standard relay operation, the pumper at the hydrant should be shut down first after the completion of the operation. This procedure is critical for a few reasons.

Firstly, the pumper at the hydrant is responsible for bringing water from the source to the fire scene. Once the fire scene has all the water needed to extinguish the fire and the relay operation is complete, shutting down the hydrant pumper reduces the risk of water leakage or excess pressure in the supply lines that could potentially cause damage or create hazards at the scene.

Additionally, shutting down the hydrant pumper first allows operators to ensure that water is still available for any potential changes in the fire situation before completely dismantling the operation. The pumper at the fire scene or any master stream operations may still require water after the hydrant pumper is shut down; therefore, it's essential to maintain their functionality until you are certain that all fire suppression needs are satisfied.

Thus, following this procedure helps maintain operational safety and efficiency during and after firefighting efforts.