What should Engine 3's intake pressure be when supplied by Engine 8?

The correct intake pressure for Engine 3 when supplied by Engine 8 is 191 psi. This figure is likely based on the specific hydraulic characteristics and performance requirements of the apparatus being used. Engine supply pressures must ensure adequate flow and pressure for effective firefighting operations without exceeding the operational limits of the equipment.

In this scenario, 191 psi would ensure that Engine 3 can effectively draw water while maintaining sufficient operational pressure to utilize its hoses and nozzles effectively. This value may have been derived from hydraulic calculations that consider factors such as the distance from the hydrant to the engine, elevation changes, and any friction loss in the hose used to connect the two engines.

Utilizing an appropriate intake pressure promotes safety and efficiency during firefighting efforts, as pressures that are too high can cause equipment failure or increase the risk of accidents, while pressures that are too low can hinder water delivery during critical moments. Knowing these precise pressure requirements is essential for driver engineers to ensure effective operation during emergencies.