What is the next step after connecting the attack pumper to the internal tank in a constant pressure relay?

In a constant pressure relay situation, after connecting the attack pumper to the internal tank, the immediate next step is to open all discharge valves on the dump line. This action is critical as it allows the water to flow from the attack pumper into the system that is being supplied by the water source. By opening the discharge valves, the operation can begin and ensure the water is being delivered effectively to the intended locations.

The objective of a constant pressure relay operation is to maintain a consistent pressure throughout the system while moving water efficiently from one point to another. Opening the discharge valves facilitates this process by allowing water to exit the pump and flow into the system, thus keeping the pressure at a constant level.

Any other actions, such as starting the operation of the largest capacity pumper or checking connections, are important but are secondary steps that typically would occur after establishing the flow of water from the attack pumper to the internal system. Ensuring all apparatus are connected properly is certainly crucial before beginning operations, but once the connection is made, the logical progress is to open the discharge valves to initiate water flow. Therefore, focusing on the immediate necessity of water flow helps clarify why this step is prioritized in the process.