What is the minimum pressure Engine 3 needs to pump to in case of fire pump failure?

The minimum pressure that Engine 3 needs to pump in the event of a fire pump failure is set at 390 psi. This requirement is established to ensure that adequate pressure is maintained for effective firefighting operations, especially during emergencies when equipment might not be functioning at optimal levels.

Maintaining a pressure of 390 psi allows for sufficient water flow and reach during firefighting efforts, which is critical in ensuring that the firefighting efforts can effectively combat fires and protect both lives and property. This standard is grounded in the necessity of addressing challenges that arise during fire incidents, such as changes in hose diameter, elevation, and friction loss in the system.

While other pressure levels may be considered, 390 psi is specifically designated to ensure consistent and reliable performance of the firefighting apparatus, making it the appropriate choice for this scenario.