What is the recommended mode for TPG when flowing lines that will be opened and closed?

The recommended mode for a Throttle Pressure Gauge (TPG) when flowing lines that will be opened and closed is the pressure/psi mode. This mode provides a direct measurement of the pressure in the system, allowing the operator to monitor how pressure changes in real-time as lines are opened or closed.

By using the pressure/psi mode, the driver engineer can make informed decisions about managing water flow, ensuring that adequate pressure is maintained throughout the system. This is crucial for effective firefighting operations, as any fluctuations in pressure can affect the performance of firefighting equipment and the efficacy of water delivery to the fire scene.

Volume mode, on the other hand, typically focuses on the amount of water flowing rather than the pressure itself, which may not provide the immediate feedback necessary for safely managing dynamic flow conditions. Deranged mode and fixed mode are not standard operational modes recognized for this specific context of flowing lines, further emphasizing why pressure/psi mode is the most appropriate choice.