In a relay operation, what should relay pumpers set their intake pressure relief valves at if available?

In a relay operation, it is important for relay pumpers to manage their intake pressure to ensure efficient water delivery without risking damage to the systems involved. Setting the intake pressure relief valves at a specified margin above the discharge pressure allows for a buffer that can accommodate fluctuations in pressure that might occur during operation.

By setting the intake pressure relief valves at 10 PSI above the discharge pressure, the system is allowed to manage transient pressures effectively, protecting both the pump and the connected hoses. This setting helps to prevent issues such as cavitation, which can occur when the intake pressure drops too low.

This practice also ensures that there is sufficient intake pressure for the pump to operate efficiently while reducing the risk of backflow or other pressure-related complications. Balancing the intake pressure relative to the discharge pressure is a critical component of maintaining effective relay operations in firefighting scenarios.