In a relay operation, the source pumper should begin initial operations at what psi?

In a relay operation, the source pumper is typically set to begin operations at 175 psi. This pressure is a standard starting point for many firefighting situations, ensuring that enough water is delivered through the supply line to support firefighting efforts downstream.

Setting the source pumper at 175 psi helps establish an adequate flow rate while maintaining pressure in the supply line. The key consideration here is to provide a consistent and reliable water supply to the attack pumper or other units in the relay operation, as any drop in pressure can impede effective fire suppression.

Higher pressures may be more suitable for specific circumstances or apparatus but starting at 175 psi balances efficiency and safety, making it an operational standard widely accepted in fire service protocols for relay operations. Using this setting affords flexibility to make adjustments based on the evolving conditions at the scene without starting excessively high, which could strain equipment or lead to complications in water flow management.