What is the recommended pressure at which a pumper should supply a sprinkler system?

The recommended pressure at which a pumper should supply a sprinkler system is typically set at 150 psi. This pressure is considered optimal for ensuring that water is distributed effectively through the sprinkler system, allowing it to function as intended for fire suppression. A supply pressure of 150 psi provides enough force to adequately push water through the system piping, activate the sprinkler heads, and reach the necessary heights and distances to combat a fire.

Using a pressure that is too low may result in insufficient water flow and pressure to adequately operate the sprinkler system, which could compromise fire suppression efforts. Conversely, while higher pressures are beneficial to some extent, they may cause issues such as water hammer or damage to the sprinkler system components if they exceed the design specifications. Therefore, 150 psi strikes a balance, ensuring effectiveness while maintaining the integrity of the system.