What is the recommended procedure for topping off the booster tank during flow operations?

The recommended procedure for topping off the booster tank during flow operations is to open the tank fill valve slightly and control engine RPMs. This method ensures a careful and controlled filling of the tank, reducing the risk of water hammer and potential damage to the water system. By adjusting the engine RPMs, operators can manage the water flow effectively, ensuring that the tank fills without overwhelming the pump system or the tank itself.

Controlling the engine speed allows the operator to maintain optimal pressure levels and ensure the system operates within safe parameters. It also helps to prevent surges which could occur if the fill valve were opened fully. Thus, using this approach balances the need for rapid replenishment with the safety and integrity of the entire firefighting system.